Effects of Long-term Creep at Elevated Temperatures on Rupture Ductility in 9Cr-1Mo-V-Nb-N Steel

作     者：Zhu, Lihui Zhao, Qinxin Gu, Haicheng Lu, Yansun 

作者机构：Xian Jiao Tong Univ Sch Mat Sci & Engn Xian 710049 Peoples R China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：1998年第14卷第3期

页      面：226-230页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Steel 

摘      要：Besides the creep strength, creep ductility has also been recognized as an important material parameter, since low ductility is often associated with notch sensitivity and concomitant premature failure, especially brittle fracture. Creep rupture data of 9Cr-1Mo-V-Nb-N show that the creep ductility decreases with decreasing stress at constant temperature or with decreasing temperature at constant stresses. SEM and TEM were used to investigate the mechanism of rupture ductility after long term creep was related to the decrease of mobile dislocation density, the coarsening and coalescence of carbides and the decrease of shear lip size. (Edited author abstract) 8 Refs.