9310航空齿轮真空渗碳热处理表面强化数值模拟及工艺参数优化
Numerical simulation and process parameter optimization of surface strengthening for 9310 aviation gear vacuum carburization heat treatment
张治中 1张银 2胡云波 3刘洲成2
作者信息
- 1. 中国航发湖南动力机械研究所,湖南 株洲 412002
- 2. 中南大学 极端服役性能精准制造全国重点实验室,长沙 410012;中南大学 机电工程学院,长沙 410012
- 3. 中南大学 极端服役性能精准制造全国重点实验室,长沙 410012;中南大学 机电工程学院,长沙 410012;湖南南方宇航高精传动有限公司,湖南 株洲 412000
- 折叠
摘要
为了改善航空齿轮的疲劳性能,基于真空渗碳热处理技术,对9310 航空齿轮进行热处理强化,采用有限元仿真分析方法,对表面渗碳层的碳浓度分布以及渗碳层深度进行预测,并基于正交实验法优化了真空渗碳工艺参数,最后开展了齿轮真空渗碳试验.试验结果表明:最佳优化工艺参数为渗碳温度960℃,强渗脉冲开始和结束时齿面碳浓度分别为0.84%与1.80%;渗碳后齿面微观组织为针状马氏体,心部微观组织主要为板条状马氏体以及部分残余奥氏体,表面硬度最大值740HV,心部硬度最大值 402HV;优化后的工艺参数能够有效提高渗碳层深度以及标准点碳浓度,相比优化前渗碳层标准点碳浓度提高了21.2%.
Abstract
To improve the fatigue performance of aviation gears,the 9310 aviation gears are strengthened by the vacuum carburizing heat treatment technology.The carbon concentration distribution and depth of the carburized layer on the surface are predicted by employing finite element simulation analysis method.The vacuum carburizing process parameters are optimized based on orthogonal experimental method,and finally the gear vacuum carburizing test is conducted.Our test obtains the optimal optimization process parameter with a carburizing temperature of 960℃and the carbon concentration on the tooth surface at the beginning and end of the strong carburizing pulse reaches 0.84%and 1.80%respectively.After carburizing,the tooth surface is needle-like martensite in microstructure whereas the core is mainly lath-like martensite and some residual austenite in microstructure.The maximum hardness of the surface is 740HV while the maximum hardness of the core is 402HV.Our optimized process parameters effectively improve the depth of the carburized layer and the standard point carbon concentration.Compared with the pre-optimization carburized layer standard point carbon concentration,the optimized process parameters increase the standard point carbon concentration by 21.2%.
关键词
9310航空齿轮/真空渗碳/碳浓度/有效渗碳层/工艺参数优化Key words
9310 aviation gears/vacuum carburizing/carbon concentration/effective carburizing layer/process parameter optimization引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据