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本文研究了PH15-7Mo沉淀硬化不锈钢的恒温马氏体转变。得出该钢以恒温马氏体转变为主。恒温转变速度随钢的稳定化程度的加深,转变初速减缓,孕育期增长,所形成的“C”曲线右移。恒温马氏体转变图呈双“C”型曲线,两个“C”型曲线的顶点分别约为-60℃和-100℃。恒温马氏体最大形成量可达65%。低温区的相变激活能Q1780卡/克分子。高温区的“C”曲线可看作是首先是γ——ε的转变曲线,低温区的“C”曲线是直接由γ转变到α′(马氏体)的。
In this paper, the temperature-controlled martensitic transformation of PH15-7Mo precipitation hardened stainless steel was studied. Draw the steel to constant martensitic transformation based. The constant temperature transformation rate deepens with the stabilization of the steel, the initial velocity of transformation slows down and the growth period increases. The formed “C” curve shifts to the right. The temperature-dependent martensitic transformation shows a double “C” curve with the vertices of the two “C” curves about -60 ° C and -100 ° C, respectively. The maximum formation of constant temperature martensite up to 65%. Phase change in the low temperature activation energy Q1780 card / mole. The “C” curve of the high temperature region can be regarded as the γ - ε transition curve first, and the “C” curve of the low temperature region changes directly from γ to α ’(martensite).