摘要
齿轮混晶缺陷对齿轮性能和使用寿命具有显著危害。针对17CrNiMo6钢温锻行星齿轮经渗碳淬火后出现宏观混晶现象等问题,采用3种热处理工艺下的混晶样品进行试验,以探究消除混晶缺陷的方法。结果显示,细晶区对应锻造过程中应变较大区域,应变梯度和整体应变量影响混晶晶粒分布。等温正火处理后,组织为均匀分布的铁素体+珠光体组织,改善了锻造引入的不均匀应变和组织情况;高温奥氏体化处理后,较原始状态晶粒有所细化,但仍存在部分混晶现象,平均晶粒尺寸达到13.5μm,不均匀因子为2.79;双重淬火处理可较为迅速且高效地消除混晶缺陷,平均晶粒尺寸达到10.6μm,不均匀因子为2.54。研究结果,表明宏观混晶缺陷的出现与不均匀应变有关,且混晶遗传现象可通过热处理消除。
Mixed crystal defects in gear have a significant impact on the performance and service life of gear.Therefore,for the problem of macroscopic mixed crystal phenomenon occurred in 17CrNiMo6 steel warm forging planetary gear after carburizing and quenching,the mixed crystal samples by three kinds of heat treatment processes were tested to explore the method of eliminating mixed crystal defects.The results show that the fine grain area corresponds to the area with large strain during the forging process,and the strain gradient and overall strain affect the distribution of mixed crystal grains.After isothermal normalizing treatment,the microstructure is a uniformly distributed ferrite+pearlite,which improves the uneven strain and microstructure introduced by forging.After high-temperature austenitization treatment,the grains are refined compared with the original state,but there is still some mixed crystal phenomenon,the average grain size reaches 13.5μm,and the uneven factor is 2.79.Double quenching treatment can eliminate mixed crystal defects quickly and efficiently,the average grain size reaches 10.6μm,and the uneven factor is 2.54.The research results show that the appearance of macroscopic mixed crystal defects is related to uneven strain,and the phenomenon of mixed crystal inheritance can be eliminated by heat treatment.
作者
王礼银
左彪
孙万利
戴柯明
许宝玉
张朝磊
Wang Liyin;Zuo Biao;Sun Wanli;Dai Keming;Xu Baoyu;Zhang Chaolei(Technology Center,Zenith Steel Group Co.,Ltd.,Changzhou 213011,China;Jiangsu Airship Co.,Ltd.,Taizhou 225300,China;Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing 100083,China;Liaoning Academy of Materials,Shenyang 110179,China)
出处
《锻压技术》
北大核心
2025年第4期229-235,共7页
Forging & Stamping Technology
