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一、前言 由对奥氏体化加热温度过高而使钢变脆的现象,虽然早为人们所熟知,但是对于“过热”这个术语,人们至今却有不同的理解。 众所周知,高温加热导致的组织变化有三个阶段:①晶粒粗化;②硫化锰在高温下固溶,随后冷却时在高温奥氏体晶界上析出;③温度再高时,奥氏体晶界开始熔化,硫和磷向晶界偏析,随后冷却时,除有硫化锰析出外,还有磷化铁薄片和FeCr_2S_λ析出。
I. INTRODUCTION Although the phenomenon of embrittlement of steel by the overheating of the austenitizing temperature is well known, there is a different understanding of the term “overheating” so far. It is well-known that there are three stages of microstructure changes caused by high temperature heating: ① grain coarsening; ② solid solution of manganese sulfide at high temperature and subsequent precipitation at high temperature austenite grain boundaries; ③ when the temperature is high, austenite The world began to melt, sulfur and phosphorus to the grain boundary segregation, followed by cooling, in addition to manganese sulfide precipitation, as well as iron phosphide flakes and FeCr_2S_λ precipitation.