不同表面改性对超强耐热航空齿轮钢弯曲疲劳性能影响  

Influence of Different Surface Modifications on Bending Fatigue Performance of Super Heat-resistant Aviation Gear Steel

作　　者：朱文林 唐鑫[1,2] 朱如鹏 贺自强[3] 李发家[4] 陆凤霞 杨长树[3] ZHU Wenlin;TANG Xin;ZHU Rupeng;HE Ziqiang;LI Fajia;LU Fengxia;YANG Changshu(National Key Laboratory of Helicopter Aeromechanics,Aero Engine Corporation of China Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China;National Key Laboratory of Helicopter Aeromechanics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Aero Engine Corporation of China Beijing Institute of Aeronautical material,Beijing 100081,China;School of Mechanical Engineering,University of Jinan,Jinan 250022,China)

机构地区：[1]中国航发湖南动力机械研究所直升机动力学全国重点实验室,湖南株洲412002 [2]南京航空航天大学直升机动力学全国重点实验室,江苏南京210016 [3]中国航发北京材料研究院,北京100081 [4]济南大学机械工程学院,山东济南250022

出　　处：《湖南大学学报(自然科学版)》2025年第4期195-203,共9页Journal of Hunan University:Natural Sciences

基　　金：国家科技重大专项资助项目(J2019-Ⅲ-0023-0067,30104040201);国家自然科学基金资助项目(52075241)。

摘　　要：以超强耐热航空齿轮钢12Co14Ni6Cr5Mo4VNb圆柱齿轮为研究对象,采用高频脉冲法开展了不同表面改性齿轮弯曲疲劳性能试验研究,通过试验数据处理及轮齿失效机理分析,揭示了不同表面改性对超强耐热航空齿轮钢齿轮承载性能影响规律.研究结果表明:普通喷丸对超强耐热航空齿轮钢齿轮表面无明显强化效果,超强喷丸能够显著提高超强耐热航空齿轮钢齿轮表面残余压应力,相对于普通喷丸齿轮,超强喷丸齿轮弯曲疲劳极限提高了36.04%;超强耐热航空齿轮钢齿轮对齿面粗糙度敏感性较强,粗糙度Ra≤0.2的齿轮较粗糙度0.3≤Ra≤0.4的齿轮弯曲疲劳极限提高了16.58%;弯曲疲劳试验齿轮渗碳层近表面组织为高碳马氏体和细小弥散的颗粒状碳化物,并随渗层深度增加逐渐向超低碳板条马氏体过渡;试验齿轮失效模式均为轮齿疲劳断裂,断口上可见清晰疲劳条带,超强喷丸齿轮疲劳裂纹全部萌生于齿根圆角亚表面,普通喷丸齿轮疲劳裂纹大部分在齿根圆角表面萌生.Taking the super heat-resistant aviation gear steel 12Co14Ni6Cr5Mo4VNb cylindrical gear as the research object,the high-frequency pulse method was used to conduct bending fatigue performance tests on gears with different surface modifications.Through experimental data analysis and gear tooth failure mechanism analysis,the influence of different surface modification layers on the load-bearing performance of super heat-resistant aviation gear steel gears was revealed.The research results show that ordinary shot peening has no significant strengthening effect on the surface of super heat-resistant aviation gear steel gears.Super shot peening can significantly increase the residual compressive stress on the surface of super heat-resistant aviation gear steel gears.Compared with ordinary shot peening gears,the bending fatigue limit of super shot peening gears is increased by 36.04%;Super heat-resistant aviation gear steel gears are highly sensitive to the tooth surface roughness,gears with roughness Ra≤0.2 showing a 16.58%increase in bending fatigue limit compared with gears with a roughness of 0.3≤Ra≤0.4.In the bending fatigue test,the microstructure of carburized layer near the surface of the gear is high-carbon martensite and finely dispersed granular carbides,and it gradually transits to ultra-low carbon flat noodles martensite with the increase of carburized layer depth.The failure mode of the test gears is fatigue fracture of the gear teeth,with clear fatigue bands visible on the fracture surface.The fatigue cracks of the super shot peening gears all originate from the sub surface of the tooth root fillet,while the fatigue cracks of ordinary shot peening gears mostly originate from the surface of the tooth root fillet.

关 键 词：超强耐热钢 表面改性 残余压应力 弯曲疲劳 失效机理 

分 类 号：V252.1[一般工业技术—材料科学与工程]