Effect of Peak Temperatures on Microstructure and Properties of Welding Coarse Grain Heat-Affected Zone of SA508 Gr.4N Steel
Author:
Lu Shumeng,Wan Li,Yang Hongfu,Zheng Shanju,Li Mengnie,Duan Yonghua,Xu Zhongdong
Abstract
The effect of peak temperatures on the grain growth, microstructure transformation and Vickers hardness of the weld coarse grain heat-affected zone (CGHAZ) of SA508 Gr.4N steel for nuclear reactor pressure vessel was studied. The results show that different t8/5 time has no obvious effect on grain growth at the same peak temperature, but different peak temperatures have a great influence. The higher the peak temperature, the more obvious the effect on grain growth. The grain size distribution at different peak temperatures and t8/5 time conforms to the Gaussian normal distribution curve, and a grain growth model suitable for CGHAZ of SA508 Gr.4N steel has been established. The room temperature martensite structure can be obtained by treatment at different peak temperatures and t8/5 time. At the same peak temperature, there is no significant difference in martensite structure at different t8/5 time, and the size of martensite lath only increases with the increasing peak temperatures. At different peak temperatures and t8/5 time, grain size has less effect on the Vickers hardness, which is closely related to the room temperature microstructure of the material.
Funder
Yunnan Fundamental Research Projects
Yunnan Ten Thousand Talents Plan Young and Elite Talents Project
Innovation Team Cultivation Project of Yunnan Province
Natural Science Research Foundation of Kunming University of Science and Technology
Subject
General Materials Science,Metals and Alloys
Cited by
1 articles.
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