一种新型大直径锻造钢球B3的组织性能探究
Research on Microstructure Performance of New Type Large-diameter Forged B3 Steel Ball
任成艳 1张如华 1徐强 1曾效舒 2黄明富 3龚雪剑3
作者信息
- 1. 南昌大学 机电工程学院,江西 南昌 330031
- 2. 南昌大学 机电工程学院,江西 南昌 330031;共青科技职业学院,江西 九江 332020
- 3. 江西铜业集团(余干)锻铸有限公司,江西 上饶 335100
- 折叠
摘要
以性能较好的 φ125 mm锻球为参照,对新用于锻造钢球的B3 钢力学性能及微观组织进行研究.结果表明:φ140 mmB3 钢球的整体硬度在 56.0～59.5 HRC,冲击韧性在 23.00～29.90 J/cm2;B3 钢球表层组织主要为针状马氏体,心部除马氏体外还有较多的托氏体与贝氏体.导致该现象的原因是锻球心部Mn、Cr含量分布不均匀,以及淬火温度偏低,锻球心部冷速不够,过冷奥氏体易转变成细片团状托氏体,同时较高的含碳量降低了马氏体转变温度,加剧了锻球心部向贝氏体和托氏体转变的倾向.
Abstract
Taking φ125 mm forging ball as reference,the mechanical properties and microstructure of B3 steel newly used for forging steel balls were researched.The results show that the overal hardness of B3 ball is between 56.0-59.5 HRC,the impact toughness is between 23.00-29.90 J/cm2.The surface microstructure of B3 ball is mainly acicular martensite.There are much troostite and bainite in the heart besides the martensite.The reasons for the phenomenon are the Mn and Cr contents which are not uniform in the heart of B3 steel ball,and the quenching temperature is lower,the cooling rate of heart of forging ball is slow,the supercooled austenite easily transforms into fine flake troostite,while higher carbon content decreases the martensite transition temperature,which can accelerate the tendency of forging heart transforming into bainite and troostite.
关键词
锻造磨球/微观组织/扫描电镜/能谱仪Key words
forged grinding ball/microstructure/SEM/EDS引用本文复制引用
出版年
2024
NETL
NSTL
万方数据