通过对马氏体的显微组织进行分析，并结合线膨胀试验得到的相变动力学信息研究了30CrNi3MoV低合金超高强钢中的马氏体相变特征，结果表明：淬火冷却30CrNi3MoV钢的相变产物包括低碳板条状和高碳针状两种马氏体形态，两者的形成在动力学曲线中截然分开，板条马氏体形成于Ms以下的较高温（310℃～260℃），相变过程中发生了碳的重新分配，造成富碳奥氏体微区的形成；高碳针状马氏体形成于Ms以下的较低温（260℃～170℃），由富碳奥氏体微区转变而成，板条马氏体形成速率远高于针状马氏体。
Martensitic phase transformation characteristics in the 30CrNi3MoV low-alloy ultra-high strength steel were investigated by means of microstructure observation and dilatometric measurements. The results showed that the transformation products in the quenched 30CrNi3MoV steel were two kinds of martensite with different morphologies, lath martensite and acicular martensite, formation of which clearly separate each other in transformation dynamics curves. Lath martensites form in the relatively high temperature range (310℃ ~ 260℃ ) below the Ms, during which diffusion of carbon atoms occurred and resulted into carbonrich austenite micro regions around martensite lath bunches. Acicular martensites form in the relatively low temperature range (260℃ ~ 170℃ ) below the Ms, which are transformed from the carbon-rich austenite micro regions retained after the formation of lath martensites. Transformation rate of the lath martensite is obviously higher than that of the acicular martensite.
参考文献
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