球化温度对4Cr5Mo2V热作模具钢组织和性能的影响  

Effect of spheroidizing temperature on microstructure and properties of 4Cr5Mo2V hot work die steel

作　　者：常永 李立[1,2] 吴少君 左鹏鹏 吴晓春[1,2] Chang Yong;Li Li;Wu Shaojun;Zuo Pengpeng;Wu Xiaoehun(School of Materials Science and Engineering,Shanghai University,Shanghai 20044.,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444

出　　处：《金属热处理》2021年第3期46-50,共5页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFB0300402)。

摘　　要：采用光学显微镜和扫描电镜观察了4Cr5Mo2V钢在不同球化温度退火过程中的显微组织变化,利用图像处理软件Image Pro Plus定量分析了碳化物的数量、平均粒径及体积分数,进而研究了球化退火对4Cr5Mo2V钢淬回火状态下力学性能的影响。结果表明,当球化温度在820~900℃时,碳化物的单位面积个数、体积分数和平均粒径分别在(10.0~14.0)×10^(8)cm^(-2)、8.0%~10.0%和0.30~0.43μm之间。球化温度为840℃时,可有效消除不均匀退火组织,碳化物平均粒径为0.31μm;其室温冲击吸收能量为392 J,具备良好的力学性能。Metallographic microscope and scanning electron microscope were used to observe the microstructure change of 4Cr5Mo2V steel at different spheroidizing temperatures.The image processing software Image Pro Plus was used to quantitatively analyze the number,average particle size and volume fraction of carbides.Then the influence of annealing spheroidizing on the mechanical properties of the quenched and tempered 4Cr5Mo2 V steel was studied.The results show that when the spheroidizing temperature is 820-900℃,the number of carbides per unit area,volume fraction and average particle size are between(10.0-14.0)×10^(8)cm^(-2),8.0%-10.0%and 0.30-0.43μm,respectively.When the spheroidizing temperature is 840℃,the inhomogeneous annealing structure can be effectively eliminated,the average particle size of the carbide is 0.31μm,and the impact absorbed energy at room temperature is 392 J,with good mechanical properties.

关 键 词：4Cr5Mo2V热作模具钢 球化温度 退火组织 碳化物 

分 类 号：TG156.2[金属学及工艺—热处理]