大规格42CrMoS钢棒的横向冲击韧性及其主要影响因素  

Transverse Impact Toughness and Its Main Influencing Factors of Large Size 42CrMoS Steel Rod

作　　者：赖承班 张燕呢 闵永安(导师) 周坤 LAI Chengban;ZHANG Yanni;MIN Yongan;ZHOU Kun(State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Jiangsu Zhuhong Forging Co.,Ltd.,Wuxi 214154,China)

机构地区：[1]上海大学材料科学与工程学院,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 [2]江苏铸鸿锻造有限公司,无锡214154

出　　处：《机械工程材料》2023年第3期55-59,65,共6页Materials For Mechanical Engineering

基　　金：上海大学新材料(泰州)研究院资助项目(SDXCL-02)。

摘　　要：在直径为380 mm的锻态42CrMoS钢棒的不同部位处取样,进行850℃水冷淬火或风冷淬火以及相同工艺高温回火处理,研究了热处理后的显微组织、硫化物夹杂形貌和数量及其对横向冲击韧性的影响。结果表明:钢棒未出现严重的元素偏析;在水冷淬火和风冷淬火条件下不同部位的横向冲击吸收功分别在21.6~35.6 J和12.7~17.7 J;钢棒中硫化物的形貌比其数量对横向冲击韧性的影响更显著,细小、均匀分布的点状硫化物对横向冲击韧性的不利影响相对较小;在风冷淬火和高温回火试样中显微组织中每增加10%面积分数的贝氏体,其横向冲击功下降6%左右,回火索氏体组织对横向冲击韧性影响程度的权重大约是贝氏体组织的2.5倍。Samples were taken from different parts of the forged 42CrMoS steel bar with a diameter of 380 mm,and then were treated by water cooling quenching or air cooling quenching and high temperature tempering with the same process.The microstructure,morphology and quantity of sulfide inclusions and their effects on the transverse impact toughness after heat treatment were studied.The results show that there was no serious element segregation in the steel bar.The transverse impact absorption energy of different parts under water cooling quenching and air cooling quenching conditions was 21.6-35.6 J and 12.7-17.7 J,respectively.The morphology of sulfides in the steel bar had more significant influence on the transverse impact toughness than the quantity.The fine and uniformly distributed point sulfide had relatively little adverse effect on the transverse impact toughness.When every 10%area fraction bainite was introduced into the microstructure of the air cooling quenched and high temperature tempered samples,the transverse impact absorption energy decreased by about 6%,and the degree of the influence of tempered sorbite on the transverse impact toughness was about 2.5 times that of the bainite.

关 键 词：42CrMoS钢 横向冲击韧性 硫化物夹杂 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]