轴类锻件用中锰钢的高温热塑性  

High temperature thermoplastic of medium manganese steel for shaft forgings

作　　者：栾玉琦 吴红艳[1] 王琬淇 高秀华[1] 杜林秀[1] Luan Yuqi;Wu Hongyan;Wang Wanqi;Gao Xiuhua;Du Linxiu(State Key Lab of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《金属热处理》2022年第10期52-57,共6页Heat Treatment of Metals

摘　　要：对轴类锻件用中锰钢进行了高温热塑性研究。在不同温度下对试验钢进行了不同应变速率的高温拉伸试验,绘制了试验钢在不同条件下的高温热塑性曲线,并通过研究高温拉伸断口的形貌和组织分布,分析其断裂机理。结果表明,试验钢在650~1200℃范围内断面收缩率均达60%以上,热塑性良好,无脆性温度区。试验钢的高温拉伸断口附近组织为马氏体组织,在热塑性稍差的温度点(750,900℃)对应的组织中含有少量先共析铁素体。试验钢在650~1050℃范围内的断裂方式为穿晶韧性断裂,在1100~1200℃的断裂方式为沿晶断裂。High temperature thermoplastic of medium manganese steel for shaft forgings was studied. High temperature tensile tests were carried out on the tested steel at different strain rates and different temperatures, and the thermoplastic curves of the tested steel under different conditions were drawn. The fracture mechanism of the tested steel was analyzed by studying the morphology and structure distribution of high temperature tensile fracture. The results show that the reduction of area of the tested steel is more than 60% in the range of 650-1200 ℃, and the steel has good thermoplasticity and no brittleness temperature zone. The microstructure near high temperature tensile fracture of the tested steel is martensitic and there is a small amount of proeutectoid ferrite in microstructure corresponding to the temperature point(750, 900 ℃) with poor thermoplasticity. The fracture mode of the tested steel is transgranular ductile fracture in the range of 650-1050 ℃, but intergranular fracture in the range of 1100-1200 ℃.

关 键 词：中锰钢 高温拉伸 高温热塑性 断口形貌 断裂方式 

分 类 号：TG142.33[一般工业技术—材料科学与工程]