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4) (25) a) What are three combined factors that cause Stress Corrosion Cracking (SCC)? b) Which alloy is more resistance to SCC in Figure 4.17?
4) (25) a) What are three combined factors that cause Stress Corrosion Cracking (SCC)? b) Which alloy is more resistance to SCC in Figure 4.17? Why? c) With the evidence given in the case given below: Tell whether SCC, CFC, HIC or a combination of them may be cause of failure for the case. Highly-cold worked alloy, intergranular unbranced crack, sharp crack tip, room temperature failure" ii) "Alloy under constant stress, transgranular branched cracks, sharp cxactips" 1.1 10 NOBLE 09 0.8 Hastelloy C 276 a Hasty C Hastelloy B 07 0.6 05 POTENTIAL EVVS. SCE 011 O 03 02 01 D 01 ACTIVE -02 013 10 10 100 1000 10.000 CURRENT DENSITY (A/cm2) FIGURE 4.17 Comparison of potentiostatic anodic polarization of nickel alloys in H.SO, ambient temperature. (By courtesy of F. G. Hodge. Haynes International)
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