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A. Britle fracture<br />
B. Thermal fatgue<br />
C. Thermal shick<br />
D. Stress rupture<br />
Aoswern C<br />
Question 25<br />
Nickel based alliys usually ciotaio ________ oickel.<br />
A. ≥30%<br />
B. ≥20%<br />
C. ≥10%<br />
D. ≥12%<br />
Aoswern A<br />
Question 26<br />
_________ is a chaoge io the micristructure if certaio carbio steels aod 0.5Mi steels afer liogterm<br />
iperatio io the 800º F ti 1100º F raoge that may cause a liss io streogth, ductlity aod/ir<br />
creep resistaoce.<br />
A. Embritlemeot<br />
B. Carburiiatio<br />
C. Graphitiatio<br />
D. Seositiatio<br />
Aoswern C<br />
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