Volume 12 - Fractography Part 10 pdf

... SEM, 300×. Fig. 488: Enclosed area in Fig. 487. SEM, 100 0×. Fig. 489: Enclosed area in Fig. 488. Note numerous fine microvoids (dimples). SEM, 10, 000× (General Motors Research Laboratories)

Ngày tải lên: 10/08/2014, 13:20

... (194 0-1 942) (Member, 193 7-1 942) • L.B. Case (193 1-1 933) (Member, 192 7-1 933) • T.D. Cooper (198 4-1 986) (Member, 198 1-1 986) • E.O. Dixon (195 2-1 954) (Member, 194 7-1 955) • R.L. Dowdell (193 8-1 939) ... (Member, 194 4-1 951) • L.J. Korb (1983) (Member, 197 8-1 983) • R.W.E. Leiter (196 2-1 963) (Member, 195 5-1 958, 196 0-1 964) • G.V. Luerssen...

Ngày tải lên: 10/08/2014, 12:22

... da/dN, mm/cycle 4 3.5 4 × 10 -6 Air 12 11 4 × 10 -4 Vacuum 4 3.5 1 × 10 -7 The fatigue crack growth rate at ∆K = 12 MPa m (11 ksi in ) was 100 times greater in air and 200 times ... strain rates of 6.7 × 10 -3 s -1 and 6.7 × 10 -5 s -1 (Ref 247). For materials having an ASTM grain size greater than 3, testing at a strain rate of...

Ngày tải lên: 10/08/2014, 12:22

... View Cameras For laboratories doing frequent analyses of fractures, a camera with a 4- × 5-in. (10 0- × 125 -mm) Polaroid back is almost a necessity, because it provides immediate availability ... 1×, the lens-to-film distance (bellows length) begins to exceed the lens-to-object distance and approaches a limiting value of M c f. Similarly, at higher magnification, the lens-to-obj...

Ngày tải lên: 10/08/2014, 12:22

... wall thickness that was made from quenched-and-tempered AISI 103 0 aluminum-killed fine-grain steel with an impact transition temperature below -4 5 °C (-5 0 °F). At room temperature, ductile rupture ... in a cup-and-cone fracture or by an alternate slip method producing a double-cup fracture. Cup-and-cone fractures are observed in ductile iron-base alloys, brass, and Duralumin; do...

Ngày tải lên: 10/08/2014, 12:22

... μ m) iron-titanium-molybdenum-rich particles were also observed. The larger particles were either titanium- or zirconium-rich, and these may also be an MC-type precipitate. Such grain- boundary ... examination. Figure 4 shows the range of particle sizes and a typical distribution of particles from a fracture surface of an Fe-0.03C-18.5Ni-3Mo-1.4Ti-0.1Al maraging steel specimen that was ....

Ngày tải lên: 10/08/2014, 12:22

... 580 512 (c) 77 L p (mm) L ' p 66.6 84.8 106 .7 (b) 60 N L (mm -1 [N' L ] φ (a) 0.0731 0.0465 0.037 -4 9 N S (mm -2 ) N' A 3.45 × 10 -3 1.73 × 10 -3 1.95 × 10 -3 ... values Ref Al-4Cu 1.48 0-2 .390 18, 69 X7091 aluminum alloy 1 .1 2- 1.31 81 Ti-24V 1.064 82 Ti-28V 1.06 0-1 .147 16 4340 steels 1.44 7-1 .908 24, 6...

Ngày tải lên: 10/08/2014, 12:22

... of 100 to 125 μm corresponds to a ductile-to- brittle transition temperature of approximately 100 °C ( 212 °F). SEM, 450× (J.M. Rigsbee, University of Illinois) Fig. 124 Fig. 125 Fig. 126 ... Fig. 124 , 125 , and 126 . Fig. 127 : Craters and cavities on fractured collar. Note dark, roughly circular markings in large cavity. SEM, 8×. Fig. 128 : Close-up of dark patches. SEM,...

Ngày tải lên: 10/08/2014, 12:22

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Ngày tải lên: 10/08/2014, 13:20

... grain-boundary triple points. 100 ×. Fig. 689: Wedge-type cavities (wedge cracks) form at triple points due to grain-boundary sliding and may be promoted by decohesion at interfaces between grain- ... iron-aluminum alloys, especially those with higher aluminum contents. Shown here are fractographs of the flat fractures from tensile samples of an experimental iron-aluminum alloy (Fe-8Al-...

Ngày tải lên: 10/08/2014, 13:20