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采用金相、电子探针、透射电子显微镜及选区电子衍射等多种方法研究了几种低合金钢、不锈钢和高温合金中硫碳化钛的形态、光学特性、晶体结构和化学组成,论述了该相的两种不同形成机理以及稀土元素对显著减少钢中这种脆性相含量的有利作用. 所研究的硫碳化物可以用化学式(Ti_(1-m)X_m)_2S(C_(1-n)N_n)表示.它们在钢中呈现沿加工方向排列并沿原始奥氏体晶界分布的板条状以及沿奥氏体晶界沉淀的极薄的薄片状两种不同形态.前者是钢和合金凝固过程中形成的,而后者是经高温加热后的冷却过程中重新沉淀的.
The morphology, optical properties, crystal structure and chemical composition of sulfur titanium carbides in several low alloy steels, stainless steels and superalloys were studied by metallographic, electron probe, transmission electron microscopy and selected area electron diffraction. Two different formation mechanisms of rare earth elements and the beneficial effect of rare earth elements on reducing the brittle phase content in steel significantly.The sulfur carbides studied can be characterized by the chemical formula (Ti_ (1-m) X_m) _2S (C_ (1-n) N_n), which show two different forms of steel in the form of laths along the machine direction and distributed along the original austenite grain boundaries and extremely thin lamellae precipitated along the austenite grain boundaries, the former being steel and alloy The formation of the solidification process, which is re-precipitated during cooling after heating at high temperature.