淬火温度对S590粉末冶金高速钢组织和性能的影响  

Effect of quenching temperature on microstructures and mechanical properties of S590 powder metallurgy high speed steels

作　　者：祁进坤 岳永文 胡剑 赵钢 寇晓磊 齐国强 王宏升 任淑彬 QI Jinkun;YUE Yongwen;HU Jian;ZHAO Gang;KOU Xiaolei;QI Guoqiang;WANG Hongsheng;REN Shubin(Hebei Wu Wei Aero&Power Technology Co.,Ltd.,Zhangjiakou 075699,China;Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]河北五维航电科技股份有限公司,张家口075699 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《粉末冶金技术》2024年第1期75-83,共9页Powder Metallurgy Technology

摘　　要：采用等离子旋转电极雾化和热等静压法制备S590粉末冶金高速钢,分别在1050、1100、1150和1180℃进行淬火热处理,并经过一次550℃回火(1 h),一次−196℃深冷处理(4 h)和两次550℃回火(1 h),研究不同淬火温度对S590粉末冶金高速钢微观组织和力学性能的影响。结果表明:热处理后S590高速钢微观组织主要包括马氏体、M6C型碳化物和MC型碳化物。随淬火温度升高,碳化物逐渐溶入基体中,数量减少,基体晶粒尺寸变大。高速钢硬度和抗压强度随淬火温度升高呈上升趋势,1180℃淬火试样经后续热处理后,硬度可达HRC 67.8,抗压强度为3827 MPa;抗弯强度随淬火温度的升高先上升后下降,冲击韧性随淬火温度升高而下降,1100℃淬火试样抗弯强度达到最高,为5473 MPa;1050℃淬火试样冲击韧性最高,为76.9 J·cm^(−2)。综合考虑显微组织和力学性能,S590粉末冶金高速钢的最优淬火温度为1100℃。S590 powder metallurgy high speed steels(S590 HSS)were prepared by plasma rotating electrode atomization and hot isostatic pressing.The S590 HSS samples were quenched at 1050,1100,1150,and 1180℃,respectively,followed by the tempering at 550℃for 1 h(once),−196℃cryogenic treatment for 4 h(once),and tempering at 550℃for 1 h(twice).The effect of quenching temperature on the microstructure and mechanical properties of S590 HSS was studied.The results show that,the microstructure of S590 HSS after the heat treatments mainly consists of martensite,M6C carbides,and MC carbides.With the increase of quenching temperature,the carbides gradually dissolve into the matrix,the carbide content decreases,and the matrix grain size increases.The hardness and compressive strength of S590 HSS increase with the increase of quenching temperature.After quenching at 1180℃and the subsequent heat treatments,the hardness of S590 HSS is up to HRC 67.8,and the compressive strength is 3827 MPa.With the increase of quenching temperature,the bending strength first increases and then decreases,and the impact toughness decreases.The bending strength of the samples quenched at 1100℃reaches the highest as 5473 MPa.The impact toughness of the samples quenched at 1050℃reaches the highest as 76.9 J·cm^(−2).Considering the microstructure and mechanical properties,the optimum quenching temperature of S590 HSS is 1100℃.

关 键 词：淬火温度 粉末冶金高速钢 热处理 力学性能 

分 类 号：TF124[冶金工程—粉末冶金]