【Daily Question No. 140】2018.05.20

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【Daily Question No. 140】May 20, 2018: Regarding the temper embrittlement of chromium-molybdenum steel, which of the following statements is correct? (　　). A. The reason for the occurrence of temper embrittlement is the segregation of impurity elements and certain alloying elements in the steel toward the grain boundaries of the original austenite, which reduces the cohesion at those boundaries. B. Once a material develops temper embrittlement, its ductile-to-brittle transition temperature shifts to lower values. C. Chemical composition and heat treatment conditions are not the main factors affecting a material’s temper embrittlement. D. The temper embrittlement of a material is related only to its heat treatment conditions. Answer: A. 3 correct, 1 incorrect ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=spaceAPP through the summary post below. The short video skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670