Assessment of creep rupture properties for dissimilar steels welded joints between T92 and HR3C |
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| Authors: | 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 ZHENG‐FEI HU |
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| Affiliation: | 1. Department of Materials Science, Fudan University, Shanghai 200433, PR China;2. Shanghai Institute of Special Equipment Inspection & Technical Research, Shanghai 200062, PR China;3. Shanghai Boiler Works Ltd., Shanghai 200245, PR China;4. School of Materials Science and Engineering, Tongji University, Shanghai 200092, PR China |
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| 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. |
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| Keywords: | creep rupture dissimilar steels welded joints finite element method HR3C T92 |
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