文献类型：期刊文献

英文题名：Assessing Toughness Levels for Nuclear Containment Vessels Steel to Determine the Need for Postweld Heat Treatment Based on the Master Curve Method

作者：Chen, Zehong[1];Zhang, Yalin[2];Huang, Song[1];Hui, Hu[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130,Meilong Rd, Shanghai 200237, Peoples R China;[2]Weichai Power Co Ltd, 197,Fushou East St,High Tech Ind Dev Zone, Weifang 261061, Shandong, Peoples R China

年份：2023

卷号：145

期号：3

外文期刊名：JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME

收录：;EI(收录号：20244417292474);WOS:【SCI-EXPANDED(收录号:WOS:000984501400007)】；

语种：英文

外文关键词：Fracture toughness - Pressure vessel codes - Steel heat treatment - Welded steel structures - Welding codes

摘要：In this paper, a minimum toughness assessment method of exempting postweld heat treatment (PWHT) based on the master curve method is proposed to replace the current method of determining whether to perform PWHT by material thickness. Reference temperature to prevent fracture (T0-required) for structure to be exempt from PWHT at minimum design metal temperature (MDMT) was obtained by using the master curve method under presumed stresses and flaw size. A series of exemption curves were generated for the steels used in pressure vessels with yield strength of 300 similar to 550 MPa, and the method was corrected for low-stress conditions. Then the feasibility of this method was verified by an engineering example. A SA-738Gr.B welded joint in the example was taken as the research object, the experiment showed that the weld metal was the worst part of the fracture toughness of the joint. The results of research objects which were exempted from PWHT by the proposed method are consistent with ASME Code Case N-841, which proves that this method is feasible in assessing the exemption from PWHT.