1. Assessment of creep rupture properties for dissimilar steels welded joints between T92 and HR3C.
- Author
-
Yi Gong, Jian Cao, Li-Na Ji, Chao Yang, Cheng Yao, Zhen-Guo Yang, Jun Wang, Xiao-Ming Luo, Fu-Ming Gu, An-Fang Qi, Shang-Yun Ye, and Zheng-Fei Hu
- Subjects
WELDED joints ,FERRITIC steel ,AUSTENITIC stainless steel ,POWER plants ,FINITE element method ,RESIDUAL stresses ,FRACTOGRAPHY ,SCANNING electron microscopes - Abstract
Dissimilar steels welded joints, between ferritic steel and austenitic stainless steel, are always encountered in high-temperature components in power plants. As two new grade ferritic steel and austenitic stainless steel, T92 (9Cr0.5Mo2WVNb) and HR3C (TP310HCbN), exhibit superior heat strength at elevated temperatures and are increasingly applied in ultra-supercritical (USC) plants around the world, a complete assessment of the properties for T92/HR3C dissimilar steels welded joints is urgently required. In this paper, metallographic microstructures across the joint were inspected by optical microscope. Particularly, the creep rupture test was conducted on joints under different load stresses at 625 °C to analyse creep strength and predict their service lives, while their fractograph were observed under scanning electron microscope. Additionally, finite element method was employed to investigate residual stress distribution of joints. Results showed that the joints were qualified under USC conditions, and T92 base material was commonly the weakest part of them. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF