形变对超高碳钢组织细化的影响  

Effect of deformation on microstructure refinement of an ultrahigh carbon steel

作　　者：张占领[1,2] 柳永宁[2] 张柯柯[1] 朱杰武[2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《材料热处理学报》2009年第3期89-91,共3页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(50571077,50774029);河南省杰出青年基金(074100510011)

摘　　要：研究了超高碳钢（1．58％C）的控制轧制工艺，控制轧制包括在奥氏体加渗碳体两相区连续轧制、在共析转变温度以下较高温度（750～800℃）大变形轧制。轧后空冷的组织为超细等轴铁素体基体上均匀分布球状碳化物。在共析温度以下变形累积的形变储能引发形变诱导相变，直接析出等轴铁素体和粒状渗碳体。通过控制轧制可以同时实现超高碳钢晶粒超细化、碳化物球化。A controlled rolling processing of an ultrahigh carbon steel （1.58wt% C） was researched. The rolling processing involved deformation in austenite cementite （1050- 800℃） and ferrite-cementite field （750 - 800℃ ）, and then air cooling. The microstructure of extremely fine spheroidized cementite particles in a matrix of uhrafine ferrite grains is obtained for the steel deformed by the controlled rolling process. Deformation energy accumulated during rolling at 750 - 800 ℃ initiates deformation-induced transformation from austenite to equiaxed ferritic grain and carbide particle. The high density dislocations and vacancies introduced during hot deformation promote diffusion of carbon atoms, therefore cementite spheroidization is accelerated. Ultrafine grain and spheroidized carbide can be obtained simultaneously by controlled rolling.

关 键 词：超高碳钢 超细化 球化 

分 类 号：TG156.93[金属学及工艺—热处理] TG142.31[金属学及工艺—金属学]