奥氏体化温度对合金工具钢组织和扭转性能的影响  

Effect of Austenitizing Temperature on Microstructure and Torsion Property of Alloy Tool Steel

作　　者：余子权 姚赞[1] YU Ziquan;YAO Zan(Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China)

机构地区：[1]宝山钢铁股份有限公司,上海201900

出　　处：《上海金属》2021年第6期59-64,共6页Shanghai Metals

摘　　要：研究了一种成分(质量分数)为0.75%C、2.0%Si、0.65%Mn、0.55%Cr和0.3%Mo的合金工具钢经820~960℃保温30 min奥氏体化、淬火、230℃回火60 min后的显微组织和扭转性能。结果表明:试验钢的典型组织为回火马氏体+球状碳化物,随着奥氏体化温度的升高,碳化物逐渐溶解、马氏体板条逐渐变粗;820、880和960℃奥氏体化的钢的抗扭强度依次为1731、1847和1761 MPa;钢的断裂扭转角随着奥氏体化温度的升高而增大,820℃奥氏体化的钢断裂扭转角为597°,960℃奥氏体化的钢断裂扭转角增大到了871°。Microstructure and torsion property of an alloy tool steel containing 0.75%C,2.0%Si,0.65%Mn,0.55%Cr,and 0.3%Mo(mass fraction)were investigated after austenitizing at 820 to 960℃for 30 min,quenching and then tempering at 230℃for 60 min.The result showed that(a)the typical microstructure of the steel consisted of tempered martensite and spheroidal carbides,and with the increase in austenitizing temperature,the carbide dissolved gradually and the martensite lath became coarser;(b)the torsional strengths of the steel austenitized at 820,880 and 960℃were 1731,1847,and 1761 MPa in proper order;and(c)as the austenitizing temperature increased,so too did the fracture torsion angle of the steel,being 597°for the steel austenitized at 820℃,and 871°for the steel austenitizd at 960℃.

关 键 词：合金工具钢 奥氏体化温度 碳化物 扭转性能 

分 类 号：TG142.45[一般工业技术—材料科学与工程]