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一、引言 回火马氏体脆(TME)是在高强度钢中经常遇到的一个重要问题。它的主要特征是:淬火钢在200～400℃范围内(钢的具体成份对这个温度范围有一定影响)回火时,尽管强度连续降低,室温夏比冲击试验断裂能却出现一个最低值,即在断裂能-回火温度曲线上出现一个“谷”,同时发生韧-脆转折温度的升高。“谷”的深度反映脆化的程度。一般情况下,平面应变断裂韧性试验(K_(1C)~-)也反映了这个脆化(但有例外,主
I. Introduction Tempering Martensite Brittle (TME) is an important issue often encountered in high-strength steels. Its main features are: hardened steel in the range of 200 ~ 400 ℃ (the specific composition of the steel has a certain impact on this temperature range) tempering, despite the continuous decrease in strength, room temperature Charpy impact test rupture can appear a minimum value, That is, a “valley” appears on the fracture energy-tempering temperature curve, and meanwhile, the temperature of the ductile-brittle transition increases. The depth of the valley reflects the degree of embrittlement. In general, the plane strain fracture toughness test (K_ (1C) ~ -) also reflects this embrittlement (with the exception that the main