排气系统用409不锈钢热疲劳性能试验研究

………………………………………………………张毅天 周锦佳 李武 王伟伟 林尚锦Experimental Research on Thermal Fatigue Performance of 409 Stainless Steel for Exhaust System ……………………………………………………………………………… Zhang Yitian, Zhou Jinjia, Li Wu, Wang Weiwei, Lin Shangjin

张毅天1 周锦佳2 李武2 王伟伟1 林尚锦1

（1.上汽通用五菱汽车股份有限公司，柳州 545007；2.柳州利和排气控制系统有限公司，柳州 545007）

SUH409L

摘要：不锈钢 在汽车排气系统广泛使用，在排气系统高温环境中零件材料承受高温应力和热振

SUH409L动疲劳，按照国内相关试验标准利用高温炉对 不锈钢进行高温拉伸试验，得到材料高温力学性能在

SUH409L 500 ℃、600 ℃、700 ℃时热疲劳S-N不同温度的屈服强度和抗拉强度；通过热疲劳试验，获得 在 曲

SUH409L线。试验结果对 在排气系统不同部位使用有指导作用，为排气系统产品设计时零件焊缝疲劳分析提供接近实际使用的热疲劳分析方法。

关键词：SUH409L 高温力学 热疲劳中图分类号：U465.1+1 文献标识码：B 10.19710/J.cnki.1003-8817.20200460 DOI:

Experimental Research on Thermal Fatigue Performance of 409 Stainless Steel for Exhaust System

Zhang Yitian1, Zhou Jinjia2, Li Wu2, Wang Weiwei1, Lin Shangjin1

（1.SAIC GM WULING Automobile Company Limited, Liuzhuo 545007; 2. Liuzhou Lihe Exhaust Control Systems Company Limited, Liuzhou 545007）

Abstract：stainless steel SUH409L is widely used in automobile exhaust system. Materials in exhaust system parts are subject to high temperature stress and thermal vibration fatigue in high temperature environment. In this research, SUH409L stainless steel is subject to high temperature tensile test in a high temperature furnace according to relevant domestic test standards, from which the yield strength and tensile strength of the materials at different temperatures are obtained. Through thermal fatigue test, SUH409L thermal fatigue S- N curve at 500 ℃, 600 ℃ and

700 ℃ is obtained. The test results are instructive for the use of SUH409L in different parts of exhaust system. It provides a thermal fatigue analysis method close to the actual use for the weld fatigue analysis in exhaust system design. Key words: SUH409L, High temperature mechanics, Thermal fatigue