18CrNiMo7-6钢渗碳淬火齿轮不同喷丸处理后的齿根表层应力分布  

Surface stress distribution of tooth root of carburized and quenched 18CrNiMo7-6 steel gear with different shot peening treatments

作　　者：陈永祥 李勇 张金梦 Chen Yongxiang;Li Yong;Zhang Jinmeng(Chongqing Gearbox Co.,Ltd.,Chongqing 402260,China)

机构地区：[1]重庆齿轮箱有限责任公司,重庆402260

出　　处：《金属热处理》2022年第10期234-237,共4页Heat Treatment of Metals

基　　金：国家重点研发计划(2018YFB2001605)。

摘　　要：对模数20 mm的18CrNiMo7-6钢渗碳淬火齿轮经不同喷丸处理后的齿根表层应力分布进行测试,并与未喷丸时进行了对比。结果表明,在喷丸前后18CrNiMo7-6钢渗碳淬火齿轮齿根最表层均为压应力状态,从表至里均呈先升高后降低的变化趋势。未喷丸时最表层残余应力约为-75 MPa,最大残余应力出现在次表层110~120μm处,约为-250 MPa;喷丸处理可使齿根表层残余压应力提高4~5倍,最表层残余应力在-350 MPa左右,最大残余应力出现在次表层90~110μm处,为-900~-1000 MPa。Surface stress distribution of tooth root of the carburized and quenched 18 CrNiMo7-6 steel gear with modulus of 20 mm after different shot peening treatment was tested and compared with the specimen without shot peening. The results show that the top layer of the tooth root of the carburized and quenched 18 CrNiMo7-6 steel gear before and after shot peening is all in compressive stress state, which increases first and then decreases from surface to inside. The residual stress at top layer of the tooth root without shot peening is about-75 MPa, and the maximum residual stress is about-250 MPa at the subsurface of 110-120 μm. Shot peening treatment can increase the surface compressive stress of tooth root by 4-5 times, the residual stress at top layer is about-350 MPa, and the maximum residual stress of-900 to-1000 MPa is beneath the subsurface of 90 to 110 μm.

关 键 词：18CrNiMo7-6钢 渗碳淬火 喷丸 应力 

分 类 号：TG156.3[金属学及工艺—热处理]