本文用金相显微镜、透射电镜和扫描电镜观察了09SiCrMnMoRE钢经1100℃预淬及各种亚温温度不同保温时间淬火后所得双相组织的形貌,探讨了层片型双相组织的形成机理.观察表明,在亚温加热中,奥氏体优先在晶界及板条群界形核,也在板条界经碳化物析出与溶解而后形核.奥氏体与铁素体间存在K-S关系.奥氏体呈片状沿马氏作板条界及群界定向生长有利于减小界面能及应变能.其结果导致淬火后得到层片型双相组织.
The formation of the lamellar ferrite-martensite dual-phase structuredeveloped by prequenching and subcritical quenching in 09SiCrMnMoRE steel hasbeen studied. It is shown that during subcritical annealing, austenite pools are pref-erentially nucleated at prior austenite boundaries and martensite packet boundaries,and then austenite lamellae form at lath boundaries accompanied by cementite pre-cipitation and dissolution. The lamellar austenite growth along the lath and themartensite packet boundaries is beneficial to the decrease of both the interface andthe strain energies which are necessary for austenite formation. As a result, thelamellar ferrite-martensite dual-phase structure is developed after quenching.
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