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本文报告了稀土元素含量为0～0.38％(或RE/S=0～1.5)的25MnTiB钢在1350～1400℃高温奥氏体化后再经热处理所获得的过热断口宏观和微观观察结果。发现这种断口的过热小平面上的主要第二相不是微细的α-MnS粒子,而是脆性的片状Ti_2SC、Ti(CN)和M_(23)(CB)_(60)确认这三种相在高温奥氏体晶界沉淀而脆化晶界的效果是这种钢形成过热断口的主要原因。文中还探讨了这种过热断口的形成机理以及稀土元素的作用。
In this paper, macroscopic and microscopic observations of overheat fracture of 25MnTiB steel with REE content of 0 ~ 0.38% (or RE / S = 0 ~ 1.5) after high temperature austenitization at 1350 ~ 1400 ℃ were obtained. It is found that the main second phase in the superheated facets of this fracture is not the fine α-MnS particles, but the brittle flaky Ti_2SC, Ti (CN) and M_ (23) (CB) _ (60) The effect of phase precipitation at high temperature austenite grain boundaries and embrittlement of grain boundaries is the main reason for the formation of overheated fracture of this steel. The paper also discusses the formation mechanism of this overheated fracture and the role of rare earth elements.