NGHIEN CtfU-TRAO D O I NGHIEN CU'U DAC TINH VAT LIEU BIMETAL THEP CAC BON - HOT KIM Ni67Cr18SI5B4 SAU PHUN PHU BANG PHU'aNG PHAP PLASMA RESEARCHING MATERIALS PROPERTIES OF BIMETAL CARBON STEEL - ALLOY 67NI18CR5SI4B AFTER PLASMA SPRAYING PGS, TS Ha Minh Hung, NCS Tran Van Dung, TS Phan Thach Hd Vien Nghien cflu Co - Bp Cong ThflPng TOM TAT Bdi bdo gidi thieu ve ket qud nghien cdu ddc tinh chdt cua vdt lieu bimetal thepcdc bon - hdp kim Ni67Crl8Si5B, nhdn dUdc bdng phUdng phdp phun plasma tgi vung bien gidi lien ket ldp, nhdm muc tieu Ung dung cho viec phuc hoi cdc chi tiet mdy co dgng hinh tru sau bi mdi mon Tinh chdt cua vdt lieu ldp phu dUdc khdo sdt bang phUdng phdp kim tUdng hgc vd phdn tich SEM-EDX nhdm muc dich xdc dinh sU khac cua moi lien ket kim logi dUdc hinh thdnh gida cdc ldp phu vdi ldp kim logi nen thong qua hai che phun bgt hdp kim trUc tiep vdo chi tiet true vd thong qua mgt ldp lot cong nghe trung gian Ket qud phdn tich SEM-EDX cho phep xdc dinh thdnh phdn hoa hgc cdc phdn td cdu triic kim logi ldp phu, tren bien gidi ldp vd kim logi nen cd bdn Do Id nhdng ludn cd khoa hgc minh chdng cho cdng, ben bdm dinh gida ldp phu vdi kim logi nen dam bdo chdt lUdng cua chi tiet mdy ldm viec dieu kien tdi trgng ldn vd chiu mdi mon cao bg doi tiep xuc vdi bge trUdt bdng hdp kim dong Ddy cUng Id mgt phdn ket qud nghien cdu thUc nghiem cua nhom nghien cdu tai Trung tdm CTANARIME, Vien Nghien cdu Cd vd co sU trUc tie'p tham gia cua nghien cdu sinh ABSTRACT This article introduce on research Results of Materials Properties of 67Ni 18Cr5Si4B Bimetal Carbon Steel - Alloy existing in border area of two materials joined by plasma spraying method for the purpose of recovering worn cylindrical-shape machine parts Investigating Material properties of the coating layer by means of crystal structure analysis and SEM-EDX analysis method for the purpose of determining properties of joints between coating layer and primary material received from two types of alloy powder spaying: directly on journal and on advance spayed lining layer SEM-EDX analysis result allows determining chemical component, crystal structure of coating layer, intermediate area of coating layer and primary layer That is scientific evidences proven for affection of hardness and durability of Plasma spraying coating layers serving as copper-alloy bush plain bearing and under working conditions of heavy loads and high abrasives This is a part of experiment research result of research team of CTA-NARIME Center of National Research Institute of Mechanical Engineering, in which Ph.D students is a key member ^ TAP CHf CO KHf V I £ T NAM V S6 I+2(Thang 1+2 n i m t ) NGHIEN CUfU - TRAO D | Cac miu thi nghiim sau phun dflpc tich rdi de khao sat cic die tmh vat lieu niu tren, sfl dung cic thiet bi va phan tich chuyen dung hien dai tai Phong thi nghiem Kim loai hpe vi Nhiet luyen (TrUdng Dai hoc Bich khoa Ha Noi) v i Trung tam Dinh gia HU hong Vat Keu (Vien Khoa hpe Vat h i u - Viin KHCN Viet Nam) I.DATVANDE D i e tinh vat Ueu bunetal thep eic bon hpp kim Ni67Crl8Si5B4 nhan dflpc bing phflpng phap phun plasma dflpc dinh gia ehu yeu thong qua eic tieu chi nhfl: Chieu day ldp phu va Idp trung gian (neu co); Dp cflng tai trpng nho eac Idp vit lieu nin va ldp phu; dp xop ldp phu; dp ben bam dinh gifla ldp kim Ioai nen va ldp phu; to chflc te vi kim loai lan can bien gidi ldp BAN LUAN KET QUA THf NGHIEM 3.1 Chieu day va cflng ldp phu hdp kim 67Nil8Cr5Si4B: Cae die tinh niu tren cfla vat heu n h i n dupc sau phun phu plasma can dUpc nghien cflu khao sit bang thUe nghiem Trong bai bao nay, gidi thieu khai quit mpt so ket qua nghien cflu cua tac gii nhan dflpc tren mot s6 m i u thi nghiim theo quy hoach thflc nghiem, de cap trpng tam vao to chflc te vi kim loai bang phflpng phip hien vi quang hoc v i phan tieh SEM-EDX Ket q u i thflc nghiem kich thUdc chieu day ldp phu va ldp trung gian trin cac mau nhan dupe d mpt so che dp dii'n hinh thi nghiim hieu chmh cong nghe cho bing Dp cflng theo tai trpng nho theo sP do di tfl Idp phu hop kim Ni67Crl8Si5B4 (phia trai) sang loi thep cic bon (phia phai) cho d hinh 2a Tfl cho thay kich thflde cac vet an tren inh cau true tUPng flng vdi mau khao sit so 5.1 va 7.1 quy hoach thflc nghiem ting dan tfl phan ldp phu sang phan loi thep Ket q u i dp edng eac Idp cho bang 2 PHl/ONG PHAP NGHIEN CUtJ Mau thi nghiem phun phu nhan dupc theo cic chi dp quy hoach thUc nghiem hiiu chinh vdi cac thong so chinh nhU sau: cU ly phun khoang L = 100 -^ 200 (mm); lUu lUpng cap bpt tang Bdng Chieu ddy cdc Idpphu hdp kim 67Nil8Cr5Si4B len khoing MG = 300 ^ 500 (g/ph); toe dp luong chpn khoang V = 200 ^ 300 (m/s) Chieu day cac ldp Irung giati va ldp phu, &,\im TT Ky hieu Tren hinh a li anh chup eac mau thi nghiem trUdc Ldp phu hop Bien gicii Trung phun phu, hinh l b - sau phun plasma binh lien kel SSBHf KL-1 40-50 45 500 - 600 550 KL-2 25-35 30 500 - 600 550 KL-4 40-50 45 500 - 700 600 KL-2 25-35 30 500 ^ 600 550 Ghi chu KL - mdu phun phii khong c6 ldp lot trung gian Hmh l.Mdu thep C.45 trUdc thi nghiem phun phu (a) vd sau phun phu (b) Bdng Do cting ldp phii hop Icim 67Nil8Cr5Si4B TT Ky,„e„„,i, ' ••, Kl Ldp phli (W ngoai vio ldi) Ldp trung gian(bien gidi hen ket) KL • I 140.173.188,206.220,224 (Trung binh 191.83) 253,254; 258; 260 (Trung binh 256,25) 769, 765; 687; 609 (Trung binh; 707,5) Cl $-^-2 141;!45; 146; 146; 143; 142 (Trung binh' 144,5) 313,346,336 (Trung binh 331,67) 560; 590,587; 600; 580; 601 (Trung binh: 586.33) CLy73-l 146, 147; 152; 157; 146 (Trung binhT49,6) 360; 358; 365 (Trung binh; 361,0) 587; 506; 519, 517; 587; 600 (Trung binh; 552,67) CL97S-2 136,137, 136; 137; 136 (Trung binh; 136,4} 350; 358; 340 (Trung binh 349,33) 394; 348; 625; 405.515; 394,442 685 (Trung binh:476,0) • ' 1.,, Do Cling theo thit ti( vet do, HV Ldp thep nen -15 (lif ldi ra) tn.iupiumpi li khong cd top hi Irung gian, CL - mdu c6 ldp lot Irung gian TAP CHI CO KHI VIET NAM S6 1+2 (Thang 1+2 nam 2013) NGHIEN CUfU-TRAO e l 3.2 Do x6p ldp phu hdp kim 67Nil8Cr5Si4B: Ket q u i v i tmh toin dp xop ldp phu hpp kim 67Nil8Cr5Si4B trung binh tinh trin 08 mau quy hoach thUe nhgiim va mpt so mau thi nghiem song song eho bing Ket qua tinh toan mo phdng dp xop Idp phu hpp kim 67Nil8Cr5Si4B tUpng flng vdi m i u ed dp xop dien tieh 12,3% bang phflpng phap hien vi quang hpe, sfl dung phan mem phin tieh anh sd chuyen dungbang pham mem STATISTICA cho tren hinh Bdng Do xop Idpphu hdp kim 67Nil8Cr5Si4B phun phu bang phUdng phdp plasma TT Che phun Do xop, y % Trung binh Sai so tong V, m/s MG, g/ph L Lan i Lan Lan 200 300 0,10 9,744 9,688 9,800 9,744 + 0.05% 200 300 0.15 9,000 9,852 9.426 9,426 ± 0.05% 200 300 0.20 9,154 9.308 9,000 9.154 ± 0.05% 250 400 0.10 K,5720 9,100 8,836 8,836 ± 0,05% 250 400 0.15 8,200 7,856 7,512 7,856 ± 0,05% 250 400 0,20 6.876 6,952 6,800 6,876 ± 0,05% 300 500 0,10 fi,370 6,204 6,287 6,287 ± 0,05% 300 500 0,15 5,200 5,307 ± 0,05% 250 400 0.15 5,307 5,414 Trung binh cac mau thi nghiem song song K,fi3 - 15,26 Tfl cic so lieu d bang eho thay: Dp xop trung binb cua ldp phu hop kim mau sau hiiu ehinh cdng nghi phun khong qua Idp lot Ni5AI dat khoang y,j,g = 8,63 -^ 15,26 %, tde la eao bpn cao hon 1,99 -^ 1,57 lin so vdi dp xop trung binh cua eac mau phun qua Idp Idt (y,,,,, = 5,307 -H 9,744 %) Dieu do, chflng to rang viic dieu ehinh cic thong sd phun phu gan tdi vung toi flu va d i eho phep nhan dflpc ldp Ihu hpp kim 67Nil8Cr5Si4B giam ding ke so vdi 16 thi nghiim dinh hfldng cong nghi ban dau theo quy hoach thflc nghiem • • • • li) Aliii py Ly, sd5.l \-200 ' ' ^ ft">^ " fc rn- 'CM.'' w Mdus67.1.x500 c) Mdu sd7.1,x500 Hmh Anh chup cdu true tevi vung lien ket ldp hdp kim 67Ntl8Cr5Si4B vd thep 45 (a), (b); ldp phu (c); ldp nen thep (d); Chi nhiit luyen 875-2 TAP CHI CO KHl VIET NAM V So I ^2 (Thing 1+2 n a m ) | NGHIEN CUfU-TRAO D | P h i n tich ket q u i thi nghiem tren huih cho thay: 1) Doi vdi mau thi nghiim so 5.1 (hinh a): Biin gidi ldp thep n i n C.45 v i ldp phu hpp kim 67Nil8Cr5Si4B rat tot tren toan bp chiiu dai mau k h i o sat, nhien, cd mpt tieu vung cue bp trin biin gidi lien ket ldp ed dau hiiu nhfl la mpt ldp hpp chat lien kim, dieu CO the lam giim dp ben bam dinh gifla chung Cic vet an eua dau nhan dflpc dp cflng tai trpng nhd Idp vit lieu k h i o sit ed kich thflde hinh hpe khie nhau, dieu cho thay: dp cflng ldp phu hpp kim ldn hPn dp cdng ldp n i n thep, vi kich thflde vet an ldp thep ldn hPn ldp phu hpp kim; 2) Doi vdi mau thi ngiem so 7.1 (hinh b, c, d): Biin gidi ldp thep nen C.45 va ldp phu hpp kim 67Nil8Cr5Si4B rat tdt trin toan bp chieu d i i mau khao sat, khong cd c i c tieu vung tap chat hoac hen kim cue bp Dieu ehdng to rang dp ben abms dinh gida ldp n i n thep C.45 va ldp phu hpp kim 67Nil8Cr5Si4B dat dflpc d mflc eao nhat Dac d i i m dp eflng tai trpng nho cua Idp vit lieu tren mau so 7.1 cung tflpng tu nhu doi vdi mau sd 5.1 neu tren: Dp eflng ldp phu hpp kim ldn hon dp cdng Idp nen thep, vi kich thflde vet an ldp thep ldn hpn ldp phu hpp kim; 3) Vdi dp phong dai ldn h o n (mde x500) cac vet an lorn ldp phu hop kim (hinh 4.6 e) va Idp thep C.45 (hinh d) cing cho thay ro kich thudc hinh hoc cua chung k h i c nhau, dieu minh chflng cho n h i n xet t r i n day doi vdi ca m i u thi nghiem so 5.1 v i 7.1; 3.3 Td chdc te vi va dp cflng t^ vi viing lan cin bien gidi ldp ,'ãô'^s&'.ã 5^f*~T T' ^' ::.':':: •-^• •• a) Miu io (KL), X 100 * i ^ ) Mdu so (KL), X 200 rS^y ^.P^'-r-jr* V.'V-sa c) Mdu so (CL) X100 d) Mau so6(CL), x200 Hinh Anh chup to chitc ti vi vat lieu tren bien gidi lien ket ldp thep C.45 vdi Idp phii hap kim 67NiISCrSSi4B: a, b) Mdu phun phu khong co ldp lot Ni5Al; c, d) Mdu phun phti cd ldp lot NiSAL TAP CHi C O KHl V I £ T N A M V So 1+2 (Thang 1+2 nam 2013) NGHIEN CUfU-TRAO D | Phan tieh k^t qua thi nghiem tren hinh cho thay: 1) To chflc te vi ldp phu hpp kim doi vdi mau so 5KL, nhan dflpc sau phun phu khong qua Idp lot trung gian cho tren hinh a, b (eo dp phdng dai xlOO v i x200 tflong dng) Bien gidi hen ket gifla ldp thep C.45 (d phia tren) va ldp phu hpp kim 67Nil8Cr5Si4B (d phia dfldi) tflpng doi tot Tuy nhiin, trin i n h chup td chflc te vi vit heu mau thi nghiem niy cd phat hien thay mpt vii do?n eau true cue bp tren biin gidi Idp va Idp phu hpp kim mau den, eo the la 16 xop, dieu lim giam dp b i n b i m dinh Idp, nhflng eung la tinh chat die trflng eua cong nghe phun phu Td chflc te vi ldp nen thep C.45 la kim Ioai dac xit; 2) To chde te vi ldp phu hpp kim ddi vdi mau so 6CL, n h i n dflpc sau phun phu cd ldp lot trung gian cho tren hinh c, d (cd dp phdng dai xlOO v i x200 tflpng flng) Biin gidi lien ket gifla ldp thep C.45 (d phia trin) va Idp phu lot trung gian NiSAl (phan gifla) nhin dflPc cung kha tot Tuy nhien d diy va ton tai cac doan eau true cue bd mau den tflong tfl nhU doi vdi mau so 5KL niu trin, nhUng sd Iflpng cua chung giam rat ding ke (hinh e), do dp ben b i m dinh gifla no vdi ldp nen thep C.45 tang len ding ke Ldp phu Idt trung gian (d phan gifla eac anh chup tren hinh e, d) cd miu sac hoi sam hpn so vdi ldp phu hpp kim 67Nil8Cr5Si4B (d phia dUdi) Bien gidi hen ket gifla ldp phu lot trung gian Ni5Al vdi ldp phu hpp kim 67Nil8Cr5Si4B la rat tdt, vi hau nhU khong phat hien thay cd cac tieu vung cau true cue bp kieu 16 xop vdi mau den tren bien gidi Idp niy Dieu do, lam tang dang ke dp ben b i m dinh ldp phu lot trung gian NiSAl v i ldp phu hpp kim 67Nil8Cr5Si4B va ket qua Ii lim tang dp ben bam dinh eua chung vdi ldp nen thep C.45 Td chflc te vi ldp nen thep C.45 la kim loai dac xit giong nhU doi vdi mau 5KL cho trin hinh a,b Nhfl viy, so sinh hai trUdng hpp phun hpp kim 67Nil8Cr5Si4B vao be mat mau thep C.45 khong va eo ldp lot trung gian NiSAl eho thay: chat lUpng ldp phu ndi ehung va dp ben bam dinh cfla nd vdi ldp nen thep ndi riing d trfldng hpp phun qua Idp lot trung gian cao hPn ban so vdi trfldng hpp khong ed ldp Idt Dieu chinh la phit hiin mdi cua nghiin edu sinh q u i trinh tiin hanh thflc nghiem cua minh 3.4 Do b i n b i m dinh ldp ni'n thep C.45 vdi ldp phu hop kim 67Nil8Cr5Si4B Hpp kim trung gian sfl dung cho thi nghiim phun phu la Ni5AI, nd ed kha k h i nang tao ldp lot cd dp bam dinh tot nhd kha nang khuicb tin nhom vao be mat kim Ioai nen thep thude phun hpp kim 67Nil8Cr5Si4B Ket qua xae dinh dp bin bam dfnh gifla ldp phu hpp kim va ldp thep ni'n trfldng hop phun ed ldp lot cho bang g4 Do bin bdm dinh ldp phu hdp kim 67Nil8Cr5Si4B vdi ldp thep C.45 sau dieu chinh cong nghe phun phu TT Trung binh, Sai so long, aio^ % 43,000 43.277 ± 0,05% 46.710 46,455 + 0,05% 49,100 50,164 49,632 ± 0,05% 52, 846 53.300 53,073 53.073 + 0,05% 56,700 56,251 55,802 56,251 + 0,05% ± 0.1.]'^% Dp xop % Che dd phun V,m/s MG g/ph L,ra Lanl Lan Lan 200 300 0,10 43,277 43,554 200 300 0,15 46,200 46,455 200 300 0,20 49,632 250 400 0,10 250 400 0,15 250 400 0.20 59,429 58,900 59.958 59,429 62,869 62,869 ± 0.05% 65,390 66,047 ±0,05% 300 500 0,10 63,159 62,579 a 300 500 0,15 66,047 66,704 TAP CHl CO KHi V I £ T NAM S6 1+2 (Thang 1+2 nam 2013) NGHIEN cflu - TRAO DOI LJi Hinh Do ben bdm dinh ldp hdp kim 67Nil8Cr5Si4B vd thep C.45 Nhan xet: Tfl bang ta nhan thay: - Dp edng ldp nen thep C.45, ldp bien gidi liin kit va ldp phu hpp kim 67Nil8Cr5Si4B tren cic mau sau hieu chinh cong nghe dupe khao sit, dat trung binh tUong dng Ii: HV^^ = 191,83; HVg^ =256,25 va HV,^=707,5 (mau khong qua xfl ly nhiet sau phun phu); - Dp xdp ldp phu hop kim 67Nil8Cr5Si4B tren cac miu thi nghiem sau dii'u ehinh eong nghe cd xu hUdng tang ty le thuan theo chiiu tang cua thdng so phun phu, dat gia tri khoang y^g = 4,328 ^ 9,744%, vdi sai so tong cpng ± 0,05%; ^ ' V*^*^* :'• • ' '^-'\J^i - Tfl i n h mo phong 3D dp ben bam dinh ldp hpp kim 67Nil8Cr5Si4B v i ldp nen thep C.45 eho trin hinh eho thay ro xu hfldng ting len cfla nd le thuan theo chieu tang eua thdng so phun d i ehpn, hay ndi eieh khie ting lin ty Ie nghich vdi dp xop ldp phu hpp kim Die'u rat phu hpp vdi eac nguyen Iy eP b i n nghiin cflu xae dinh dp ben eua vat lieu kim loai bpt bang phupng p h i p p h i buy mau 3-5 Ket qua phan tich EDX bien gidi ldp phu vdi ldp thep M a)_ b) Hmh Anh 2D phdn tich xop ldp phu bdng phdn mem Materrial - Dp ben b i m dinh trung b m h cua Idp phu hpp kim 67Nil8Cr5Si4B tmh tren 08 mau sau phun vdi thong so eong nghe ehinh da dflpc dieu chmh neu tren dat dflpc pham vi: Op = 43,277 -i- 66,047 MPa, vdi sai sd tong cpng ± 0,05% va cd xu hfldng giim tyle thuan theo chieu ting eua thong so eong nghe phun dupe dieu chinh Dii'u nay, ed the ly giii bdi sfl giam dp xop cua ldp phu hpp kim da lam tang diin tich tiep xuc tren thfle te gifla cac ldp phu 67Nil8Cr5Si4B vdi Idp nen thep C.45, va viy, l i m tang dp bam dinh eua Idp phu vao ldp nen (tinh tren cung mpt don vi dien tich tiep xuc tai vung liin ket ldp); Image Pro-Analizer Tren hinh va hinh the hien i n h chup eic vi tri cac tieu vung phan tieh EDX cd diem dac trUng eua to chfle te vi tren bien gidi lien ket gifla Idp phu va kim loai nen m i u vat h i u sau phun phu bang plasma tren kinh hien vi quang hgc (12,3 %) a) Mdu khdng co ldp lot Hinh Phdn tich EDX cdc tieu vung ddc trUng ldp phu hdp kim 67Nil8Cr5Si4B vd biin gidi lien ket vdi ldp thep C.45 (mdu phun phu khong co ldp lot) Q TAP CHf C O KHl V I £ T NAM • S6 1+2 (Thing 1+2 nam 2013) NGHIEN CUfU - TRAO ePi a) b) Hinh Sa phdn tich EDX cdc tieu viing co cdu ttHc dac tning ldp phd hdp kim 67Nil8Cr5St4B vd bien gidi lien ket vdi ldp thep C 45 (mduphun phu cd ldp lot) Ket qua thf nghiem phan tich EDX cho bang va bang Tti hinh cho thay: cac tieu viing co cau true dac trUng ldp phu hop kim (67Nil8Cr5Si4B + NiSAI) va tren bien gidi lien ket cua no vdi ldp nen thep C.45 duoc danh so thiJ tu til 001 den 008 de phan tich EDX Cac vi tri 001; 002; 003 va 004 thuoc vung khao sat la ldp phli hop kim (67Nil8Cr5Si4B), cac vi tri 005; 006; 007 va 008 - thuoc ^ n g khao sat la ldp phii lot trung gian (NiSAl) Til hinh cho thay: Cac vi tri 001; 002 la ldp phu hop kim (67Nil8Cr5Si4B), 003 ldp thep C.45 Bdng Ket qud phdn tich EDX mdu phun phu hop kim 67Nil8Cr5Si4B vdo ldp thep C.45 cd ldp lot trung gian Mlu CL6 C O 001 9,94 30,25 23,85 002 7,56 28.92 22,65 003 0,43 8.60 004 4,13 38,22 005 10,89 22,95 006 24.18 33,83 007 2,29 008 i8,5 Mg 0,38 Al Si Tl Nl 0,61 0,25 35,1) 100,0 1.03 0.20 39.64 100,0 90.97 100,0 Mn 1.89 45,8 31,43 41,36 W Tong, %K.! 0.38 9,20 1.79 11.22 0,17 0,25 10,13 0,38 96,98 100,0 2,18 100,0 49,44 0,34 37,51 Fe Cr 0,45 1.45 100,0 2,27 100,0 100,0 Phin tich cie so lieu bing cho thay: 1) Doi vdl mau thi nghiem phun phu ed sfl dung Idp Idt trung gian Ni5AI tren be mat Ifldp thep C.45, tgi cie vi tri khio sat tfl 001 den 004 ldp phu hpp kim 67Nil8Cr5Si4B (hinh b) da xic dinh dflpc ham Iflpng cic nguyin to nhU: C = 0,43 - 9,94 %; O = 8,6 ^ 38,22 %; AI = 22,65 ^ 45,8 %; Ni = 9,2 ^ 90,97 % va Cr = 0,61 ^ 1,89 % khoi lUpng Dieu dd cho thay: - Thinh phan hda hpe vat lieu d cac tieu vung ciu true d day gan vdi thinh phin boa hpe eua vat li^u phu ldp lot trung gian bdi ham Iflpng hai nguyen to ehinh la AI va Ni cao nhat Ham lUpng cac bon (C) cao nhat d cac vi tri khao sat 001; 002 va 003, eon oxy (O) cd h i m lUpng ldn d cie vi tri 001; 002 v i 004 (hinh b); ^ TAP CHf C O KHf VI$T NAM • Sd 1+2 (Thing +2 nim 2013) | NGHIEN CUfU-TRAO D I vvmg cd dau hieu gan tdi den ldp phu bang hpp kim 67Nil8Cr5Si4B, dac biet la d tieu vung khao sat 005 (hinh c); Tai vi tri k h i o sat 003 (hinh b) ham lupng Ni Idn nhat (90,97 %), sau Ii O (8,6 %) eho thay no tUPng flng vdi vit lieu ldp phu lot trung gian NiSAI SU ed mat d diy cua C v i O cd the dflpc giai thich la bdi q u i trinh cac hat bpt phun va dap vao loi thep C.45 de hinh lien ket gifla cac ldp phu bi xy hda va bi ehay be mat; - Tieu vung khao sat 007 co mau sang xam (hinh e) cd phan hda hpe gom nguyen to Fe Idn nhat (96,98 %), cdn nguyin to C khong dang ke (C = 2,29 %), dieu co nghia la vat Ueu cua ldp ni'n thep C.45; 2) Tai eac vi tri khao sat 005; 006 v i 008 (hinh c) da xae dinh dflpc ham lUpng cac nguyin to chinh nhU: C = 10,89 - 24,18 %; O = 22,95 ^ 37,51 %; Al = 31,43 ^ 41,36 %; Cr = 0,17 ^ 49,44 %; Fe = 0,24 -^ 2,18 %; Ni = 10,13 - 11,22 %; W = 2,27 % khoi lUpng Diiu cho thay: - Thanh phan hda hpe vat lieu tai cac tieu - Tieu vung khao sit 008 co mau den (hinh c) ed phan hoa hpe ehu yeu gdm nguyin to C = 18,5 %; O = 37,51 % va Al = 41,36 %; sat chiem ty li khdng ldn Fe = 2,18 % Dieu niy eho thay tii'u vung eau true 008 rat cd the la 16 xop eo chfla cie nguyin to Al, O v i C bi ehay qua trinh phun phu Bdng Ket qud phdn tich EDX mdu phun phu hdp kim 67Ni SCr5Si4B vdo ldp thep C.45 khong co ldp lot trung gi Mau KL5 C O 001 4,21 19,11 Mg Al 002 11,69 39,76 0,48 47,04 003 26,07 37,68 7.51 21,95 Ti Si 12,94 1,24 0,26 0,21 Phan tieh eac sd lieu bing cho thay: doi vdi mau thi nghiem phun phu khong sfl dung Idp Idt trung gian Ni5Al trin be mat Ifldp thep C.45, tai cae vi tri khao sat tfl 001 den 003 (hinh 4.9 b) da xac dinh dflpc phan boa hoc vat lieu ve cP b i n bao gom cac nguyen td ehinh nhfl: C = 4,21 ^ 26,07 %; O = 19,11 ^ 39,76 %; Al = ^ 47,04 %; Mg = ^ 7,51 %; Cr = 0,19 ^ 12,94 %; Fe = 0,63 -^ 3,78 %; Ni = 35,11 ^ 90,97 % Dieu dd cho thiy: 1) Tai tieu vung khio sat 001 (hinh b) vat lieu co cic nguyen to ehinh vdi h i m lflpng: Cr = 12,94 %; Fe = 3,78 %; Ni = 35,11 % Ham lflpng oxy vi cac bon k h i Idn (O = 19,11%; C = 4,21 %) Dieu niy cho thay vat h i u d tieu vung khao sat 001 thuoc Idp phu hpp kim 67Nil8Cr5Si4B, eung cd the Ii vung cau true cua lien kim h i Fe - Ni; TAP CHf C O KHf VIET NAM V Cr 0,40 0,19 Fe Ni Tong, %K.l, 3,78 35,11 100,0 0,77 39,64 100,0 0,63 90,97 100,0 2) Tai tieu vung khao sat 002 ed mau den dam (hinh b) vat lieu eo eic nguyin to ehinh vdi h i m Iflpng: Ni = 39,64 %; Al = 47,04 %; Fe = 0,77 %; C = 11,69 % va O = 39,76 %, diiu eho thay rat ed the day li vung cau true 16 xop cue bp c6 ehda eac nguyen to eua vat lieu Idp phu Idt trung gian Ni5Al dflpc hinh q u i trinh phun phu va n i m tren bien gidi tiep xuc vdi ldp nen thep C.45; 3) Tai tieu vung khao sat 003 miu den nhat (hinh c) vat lieu co eac nguyen to chinh v6i ham Iflpng: Ni = 90,97 %; Fe = 0,63 %; Al = 21,95 %; Mg = 7,51 %; C = 26,07 % v i O = 37,68 % Dilu cho thay ed the cho rang day la hop chat lien kim cua niken vdi cac nguyen to Fe, Al, Mg va C v i ed h i m Iflpng xy k h i cao Vung khao sit thupc ldp phu Idt trung gian bang hpp kim NiSAl So 1+2 (Thing 1+2 nam 2013) NGHIEN CUfU-TRAO D I KET LUAN Tfl nhflng phin tich, danh gii ket q u i thi nghiem neu trin cd the dfla cic ket luan sau: - Bien gidi gifla ldp nen thep C.4S vdi ldp phu lot trung gian (NiSAl) va ldp phu hpp kun 67Nil8Cr5Si4B nhan dflpc tren mau thi nghiem phun phu bing plasma nhin chung d i m b i o cd hen ket tot Tuy nhien, cdn ed nhieu vung tieu ciu true cue bp ed phan hda hpe phfle tap, da so Ii hpp chat eua cic nguyen to t h i n h phan cua hpp kim phun phu va sat (eua ldp thep nen C.45), lim giim chat Iflpng ldp phu ndi ehung va dp ben b i m dinh vdi ldp thep ndi rieng; - Chat lupng Idp phu thong qua Idp lot trung gian NiSAl (lay vi du tren mau sd 6CL) eao hpn so vdi trfldng hpp phun phu khong qua ldp lot (miu so 5KL) Do vay, khuyen cio tot nhat nin sfl dung phflpng in phun phu phuc hoi hoae tao ldp phu mdi trin chi tiet miy cd sfl dung ldp lot trung gian NiSAI • Ngay nhan bai: 08/01/2013 Ngay phan biin: 10/02/2013 NgUdi phan biin: GS, TSKH Nguyen Van Thii, Trung tam CTA-NARIME, Vien Nghiin cflu Co Tii lieu tham khao: [I], riofl peflaKUwewflOKT.TexH HayK npo4) B C MbiTMHa(1987): "riopoiuKOBaaMeTannyprHHH nanbinenHbie noKphiTH^" MocKoa, MeTan/ryprH;!, 792 crp [2] Hii Minh Hiing, Tran Van Diing (2004): "Nghien cflu flng dung cong nghe phun no tao ldp phii hpp kim Ni67Crl8Si5B4", Tap chi Co Viet Nam, so 102/T9-2005, trang 46-48 [3] TrSn Van Dung (2004): "Nghien cflu ", Bao cao Chuyen de Tien si (3), Vien Nghien cflu Co khi, Ha Noi, 2008 [4] Ngo Xuan Cfldng (2006), "Nghien cflu anh hudng cua cac thong so cong nghe phun phu den to chflc va tinh chat cua ldp phu tren nen thep C45 phuc hoi co true dong cd", Luan van Thac si Ky thuat Hoc vien Ky thuat Qua sU Ha Noi TAP CHf CO KHf VIET NAM V S6 1+2 (Thing 1+2 nam 2013) ... Trung phun phu, hinh l b - sau phun plasma binh lien kel SSBHf KL-1 40-50 45 500 - 600 550 KL-2 25-35 30 500 - 600 550 KL-4 40-50 45 500 - 700 600 KL-2 25-35 30 500 ^ 600 550 Ghi chu KL - mdu phun. .. nen thep thude phun hpp kim 67Nil8Cr5Si4B Ket qua xae dinh dp bin bam dfnh gifla ldp phu hpp kim va ldp thep ni''n trfldng hop phun ed ldp lot cho bang g4 Do bin bdm dinh ldp phu hdp kim 67Nil8Cr5Si4B... qua xfl ly nhiet sau phun phu); - Dp xdp ldp phu hop kim 67Nil8Cr5Si4B tren cac miu thi nghiem sau dii''u ehinh eong nghe cd xu hUdng tang ty le thuan theo chiiu tang cua thdng so phun phu, dat gia