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前言 Cr12MoV钢含有高达1.5％的C和Cr,Mo,V等形成碳化物的合金元素。所以常温下钢的组织是马氏体基体上分布着许多碳化物,还有不少残余奥氏体。碳化物中包括结晶时形成的一次碳化物、从奥氏体中析出的二次碳化物和从马氏体中分解析出的三次渗碳体。而基体马氏体是位错板条型和孪晶针片型共存。过剩碳化物的类型,数量,大小和分布状态;从马氏体中分解出的三次渗碳体的析出程度;马氏体类型及其大小,似及残余奥氏体的数量都直接影响钢的各项性能。众所周知,Cr12MoV钢有着两种不同的热处理工艺路线。低温淬火配以低温回火,可以使钢获得高的硬度、耐磨性和适度的红硬性。而高温淬火配以多次高温回火,可以使钢获
Preface Cr12MoV steel contains up to 1.5% of C and Cr, Mo, V and other carbide-forming alloying elements. So at room temperature steel is martensite matrix distribution of many carbides, there are many residual austenite. Carbides include primary carbides formed during crystallization, secondary carbides precipitated from austenite, and cubic carbides decomposed from martensite. The matrix martensite is dislocation lath-type and twins needle-type co-existence. The type, amount, size and distribution of excess carbides; the degree of precipitation of tertiary cementite decomposed from the martensite; the type and size of the martensite and the amount of retained austenite all have a direct effect on the Various performance. As we all know, Cr12MoV steel has two different heat treatment process routes. Cryogenic quenching coupled with low temperature tempering, can make the steel get high hardness, wear resistance and moderate red hardness. The combination of high temperature quenching with high temperature tempering, steel can be obtained