Nghiên cứu xác định các tham số công nghệ gia công cơ nhiệt tối ưu hợp kim cu ni si

NGHIEN CU'U- iKAUyOI NGHIEN CI>U XAC DINH CAC THAM S6 CONG NGHE GIA CONG CO NHIET T | UU HOP KIM Cu-Ni-Si STUDY ON DETERMINING OPTIMAL THERMOMECHANICAL PROCESS PARAMETERS OF Cu-Ni-Si ALLOY Philng liiin Anh, Phairo B^i Phird-c Khoa Ca khi, Hgc vien Ky thuat Q u ^ su, Bd Qudc phdng TOM TAX Bdi bdo ndy trinh bdy kit qud nghiin cuu dnh hudng cua cdc tham sd qua trinh ca nhiet den dg cung vd ddn dien cua hgp kim BCuNiSSi Thdng qua quy hogch thuc nghiem true giao cdp v&i cdc tham sd cdng nghe thay ddi gdm, muc dd biin dgng ngudi truac khodng (30-70) %, nhiet hda gid khodng (425-525) °C vd then gian hda gid khodng (3,5-8,5) h, nhdm td gid da xdy dung dugc cdc hdm m^c tiiu, bieu dien suphu thugc cda dd cung, dan diin vdo muc bien dgng ngudi truac, thai gian, nhiet dg hda gid dip theo vd xdc dinh cdc thdng sd cdng nghe tdi uu gia cdng hgp kim BCuNi3Si Thuc nghiem chi rang, sai sd cua cdc so lieu thtrc nghiem so vaitinhtodn khdng vugt qud % Tu khda: Hgp Mm BCuNiSSi, gia cdng canhiet, bien dang ngudi, hda gid, dd cung dg ddn diin ABSTRACT In this paper, effect of thermomechanical process parameters on hardness and electrical conductivity ofCuNi3Si alloy was studied Through the Orthogonal Experimental Desi^ (OED) method with cold pre-deformation degree of (30-70) %, aging temperature of (425-525) "C and agingtimeof (3.5-8.5) h, the authors built objective functions, that represented the dependence of hardness and electrical conductivity on cold pre-deformation degree, agingtimeand temperature, and determined the optimal technological parameters for fabrication ofCuNiSSi alloy Variations of the experimental results with theoretical calculations does not exceed % Keywords: CuNiSSi alloy, thermomechanical treatment, cold deformation, aging, hardness, electrical conductivity