40Cr钢转向节轴部直径对其淬火态组织和硬度的影响  

Influence of Diameter of Shaft Portion of 40Cr Steel Steering Knuckle on Its Microstructure and Hardness in As-quenched Condition

作　　者：祁斌 周文华 范志君 袁松 季欣威 姜能文 徐忠 周细应[2] QI Bin;ZHOU Wenhua;FAN Zhijun;YUAN Song;JI Xinwei;JIANG Nengwen;XU Zhong;ZHOU Xiying(Shanghai Jiashijiu Enterprise Development Co.,Ltd.,Shanghai 202150,China;School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201600,China)

机构地区：[1]上海嘉仕久企业发展有限公司,上海202150 [2]上海工程技术大学材料工程学院,上海201600

出　　处：《上海金属》2022年第1期8-11,共4页Shanghai Metals

基　　金：上海市崇明区科委资助项目(No.ckgy2021-13)。

摘　　要：将轴部直径为50和70 mm的40Cr钢转向节加热至860℃保温120 min水淬。检测了不同轴径的转向节淬火后的显微组织和硬度。结果表明:轴径为50 mm的转向节从表面到心部的组织主要为马氏体,而轴径为70 mm的转向节表面为马氏体,芯部为珠光体+少量铁素体。轴径为50 mm的转向节被淬透,从表面至15 mm深处的平均硬度为54 HRC;而轴径为70 mm的转向节未被淬透,从表面至15 mm深处的平均硬度为50 HRC。40Cr steel steering knuckles with shaft 50 and 70 mm in diameter were heated to 860 ℃ and helded at temperature for 120 min,and quenched in water.After this,the steering knuckles were subjected to microstructure survey and hardness measurements.The results showed that(a) the microstructure from surface to core in the steering knuckle with a 50-mm-diam shaft was predominantly martensite,whereas the steering knuckle with a 70-mm-diam shaft exhibited martensite at surface and pearlite and a small amount of ferrite in core;and(b) the steering knuckle with a 50-mm-diam shaft was throughout hardened,and had average hardness of 54 HRC from surface to a depth of 15 mm,whereas the steering knuckle with a 70-mm-diam shaft was not throughout hardened,and had average hardness of 50 HRC from surface to a depth of 15 mm.

关 键 词：汽车转向节 重新加热淬火 40CR钢 显微组织 硬度 

分 类 号：TG162.79[金属学及工艺—热处理]