Influence of retained austenite on short fatigue crack growth and wear resistance of case carburized steel
Influence of retained austenite on short fatigue crack growth and wear resistance of case carburized steel
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DOI：
10.1007/s11665-999-0007-5
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发表时间：
1999-10
影响因子：
2.3
通讯作者：
V. F. Silva;L. Canale;D. Spinelli;W. Bose-Filho;O. R. Crnkovic
中科院分区：
文献类型：
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作者：
V. F. Silva;L. Canale;D. Spinelli;W. Bose-Filho;O. R. Crnkovic
本文研究了残余奥氏体含量对渗碳SAE 8620钢短疲劳裂纹扩展和耐磨性的影响。通过渗碳工艺后采用的不同热处理途径，在渗碳外壳的显微组织中获得了不同含量的残余奥氏体。磨损测试是使用盘上销设备进行的。每转动 200 圈后，记录重量损失。在室温下进行四点弯曲疲劳试验，使用三种不同水平的应力且R=0.1。分析了裂纹长度与循环次数的关系以及裂纹扩展速率与平均裂纹长度的关系曲线。两次试验的结果均表明，渗碳层中残余奥氏体含量较高的试件表现出更长的疲劳寿命和更好的耐磨性。
The influence of the amount of retained austenite on short fatigue crack growth and wear resistance in carburized SAE 8620 steel was studied in this article. Different amounts of retained austenite in the microstructure of the carburized case were obtained through different heat treatment routes applied after the carburizing process. The wear tests were carried out using pin on disk equipment. After every 200 turns the weight loss was registered. Four point bend fatigue tests were carried out at room temperature, using three different levels of stress andR=0.1. Crack length versus number of cycles and crack growth rate versus mean crack length curves were analyzed. In both tests the results showed that the test pieces with higher levels of retained austenite in the carburized case exhibited longer fatigue life and better wear resistance.