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本文借助光学显微镜,透射电镜和扫描透射电镜,研究了回火析出碳化物对淬火—回火Mn-Cr-Ni-Mo-V低碳合金钢亚温加热转变的影响。研究结果表明,淬火马氏体经冷轧加速了回火过程中碳化物析出及铁索体再结晶,并细化了铁素体晶粒;亚温加热时,奥氏体优先在铁素体晶界和板条界上的碳化物处形核,铁素体晶内的碳化物不能成为核心;奥氏体生长受MaC型碳化物的溶解和碳及锰的扩散所控制;锰在各相中进行再分配,“回火再结晶马氏体”原始组织中奥氏体形成速率大于“回火马氏体”原始组织中的奥氏体形成速率,随加热温度升高,两者之间的差别减少;亚温加热时,奥氏体形态是组织敏感的,“回火马氏体”原始组织中形成“准网状”和“准纤维状”奥氏体,“回火再结晶马氏体”原始组织中形成等轴状奥氏体。
In this paper, the effects of tempering carbides on the subwarping heating transformation of quenched-tempered Mn-Cr-Ni-Mo-V low carbon alloy steels were studied by means of optical microscope, transmission electron microscope and scanning transmission electron microscope. The results show that the quenched martensite accelerates the precipitation of carbides during the tempering process and the recrystallization of the ferrite body through cold rolling, and the ferrite grains are refined. When the sub-temperature is heated, the austenite is preferentially ferrite Carbides at the boundaries and in the slab boundary form carbides in the ferrite crystals that do not become core; austenite growth is controlled by dissolution of the MaC-type carbides and diffusion of carbon and manganese; Re-distribution, “tempering recrystallized martensite ” austenite formation rate in the original tissue is greater than “austenitic martensite ” austenite formation rate in the original tissue, with the heating temperature increases, two The difference between the two is reduced; the austenite morphology is tissue-sensitized when heated in the sub-temperature, and the “quasi-fibrous” and “quasi-fibrous” forms in the original tissue of the “tempered martensite” Austenite, “Tempering recrystallized martensite” is formed in the original organization austenitic.