Thermomechanical fatigue behavior and lifetime prediction of niobium-bearing ferritic stainless steels

详细信息	查看全文 | 推荐本文 |

• 作者：Yong-Jun Oh^a ; ^{yjoh@hanbat.ac.kr} ; Won-Jon Yang^b ; Jae-Gyu Jung^c ; Won-Doo Choi^a
• 关键词：Thermomechanical fatigue ; Life prediction ; Deformation behaviors ; Microstructures ; High temperature steels
• 刊名：International Journal of Fatigue
• 出版年：2012
• 期刊代码：79_01421123
• 类别：et
• 出版时间：July, 2012
• 卷：40
• 期：Complete
• 页码：36-42
• 文件大小：997 K

摘要

In this study, the thermomechanical fatigue (TMF) and isothermal low-cycle-fatigue (LCF) behaviors of niobium-containing ferritic stainless steels are presented for the temperature range from 100 掳C to the maximum temperatures between 500 and 800 掳C; furthermore, we propose a new fatigue failure criterion to predict the fatigue lives of the components for different thermal cycle ranges using the TMF condition. Higher maximum temperatures during TMF cycle resulted in shorter TMF life. By modifying the Coffin-Manson equation using the temperature factor, we obtained a new parameter that was successfully correlated with the life under different maximum temperatures. The deformation responses during fatigue cycling and the fatigue microstructure were compared to elucidate the different fatigue behaviors under the TMF and LCF conditions.