热处理对差速器齿轮用SAE4320H钢组织及性能的影响
The influence of heat treatment on the microstructure and properties of SAE4320H steel used for limited slip differential gears
崔政 1孟祥英 1王瑞 1毛威昂1
作者信息
- 1. 建龙北满特殊钢有限责任公司研发部 黑龙江齐齐哈尔 016000
- 折叠
摘要
SAE4320H往往用于耐冲击耐磨损的高端制造业零件,热轧状态或退火状态进行锻造,其热处理相关的研究较少.为探究不同热处理下组织转变和力学性能的变化,将一炼钢通过BOF-LF-VD-CC工艺生产的差速器齿轮用SAE4320H钢采用水淬、油淬、空冷和炉冷的热处理工艺进行冷却并测定力学性能.试验结果表明:淬火对齿轮用SAE4320H钢的屈服强度和抗拉强度有着明显的提升,其中水淬的屈服强度和抗拉强度最高,但塑性最差.925℃正火-880℃淬火-180℃回火后,水淬得到回火马氏体组织,油淬得到回火马氏体+回火贝氏体+少量铁素体组织,空冷得到P+B+F组织,炉冷得到P+F组织.
Abstract
SAE4320H is often used for high-end manufacturing parts that are resistant to impact and wear,and is forged in hot rolled or annealed conditions.There is relatively little research on its heat treatment.To investigate the changes in microstructure and mechanical properties under different heat treatment methods,the SAE4320H steel used for the limited slip differential gears produced by BOF-LF-VD-CC process in the first melting steel plant were cooled using heat treatmentes including water quenching,oil quenching,air cooling,and furnace cool-ing,and the mechanical properties were measured.The experimental results show that quenching significantly im-proves the yield strength and tensile strength of SAE4320H steel used for limited slip differential gears,with water quenching having the highest yield strength and tensile strength but the worst plasticity.After normalizing at 925℃,quenching at 880℃,and tempering at 180℃,water quenching yields tempered martensite structure,oil quenching yields tempered martensite+tempered bainite+a small amount of ferrite structure,air cooling yields P+B+F struc-ture,and furnace cooling yields P+F structure.
关键词
SAE4320H/齿轮钢/合金/热处理/力学性能Key words
SAE4320H/limited slip differential gear steel/alloy/heat treatment/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据