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| Effect of heat treatment on microstructure and mechanical properties of super alloy GH3128 weld joint |
| ZHAO Wei1,2, HUANG Jin2, XU Guo-hua2, WANG Lei1 |
1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China;
2. High-Temperature Materials Department, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China |
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Abstract With the increasing demand of electricity and awareness of environmental protection,nuclear is gradually replacing fossil. As the core component of ULTRA-high temperature gas cooled reactor (UHTR),intermediate heat exchanger (IHX) has also attracted extensive attention. The superalloy GH3128 is expected to become candidate material for ultra-high temperature gas cooled reactor intermediate heat exchanger (UHTRIHX) due to well weldability,excellent mechanical properties,superior thermal stability and outstanding creep resistance. The welding process is necessary for heat exchanger for production and manufacture. Due to the high degree of heat input concentration and the speedy cooling rate welding. During the subsequent high-temperature service process,brittle phase precipitation and recrystallization occur in this zone,which affects the mechanical properties and long-term service life. Therefore,the GTAW welding of superalloy GH3128 sheet was conducted,the microstructure evolution,residual stress and mechanical properties of weld joint was investigated. The results show that under the optimization of welding parameters,solid-solution plate joint shows the highest tensile strength and plasticity,both room temperature and high temperature tensile fracture position were the base metal. Residual stress in the HAZ was exist without post weld heat treatment (PWHT). The hardens,and the residual stress induces μ phase precipitate in the during high temperature deformation,the precipitation of μ phase deteriorates the creep rupture properties of weld joint. Post-weld heat treatment eliminated residual stress of the joint,precipitation of μ phases was decrease during high temperature deformation,and improved the creep rupture time of weld joint. Under the Temperature of 1 200 ℃,the residual stress can provide activation energy for recrystallization,recrystallization occured in the heat affected zone of the joint during the post-weld heat treatment process. The hardness decreases,and the plastic deformation was ununiform,induced the room temperature and 950 ℃ tensile fracture position was welded joints. After different post-welding heat treatment of the solid solution plate specimen,the EBSD results showed that after the joint heat treated at 1 100 ℃×10 min,the residual stress and strain disappeared,and with the temperature raised to 1 140 ℃,the heat affected zone began to recrystallize.
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Received: 17 March 2022
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2022, Vol. 57 
