模拟焊后热处理工艺对压力容器用Q370R钢板组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.12.014

金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 92-96.DOI: 10.13251/j.issn.0254-6051.2023.12.014

模拟焊后热处理工艺对压力容器用Q370R钢板组织与力学性能的影响

邢梦楠^1,2, 胡昕明^1,2, 欧阳鑫^1,2, 王储^1,2, 刘晨希^1,2, 王勇^1,2

1.海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009;
2.鞍钢股份有限公司, 辽宁鞍山 114009

收稿日期:2023-07-18 修回日期:2023-10-14 出版日期:2023-12-25 发布日期:2024-01-29
作者简介:邢梦楠(1992—),女,工程师,硕士,主要研究方向为中厚板产品成形与工艺,E-mail:847967099@qq.com

Effect of simulated post-weld heat treatment on microstructure and mechanical properties of Q370R steel plate for pressure vessel

Xing Mengnan^1,2, Hu Xinming^1,2, Ouyang Xin^1,2, Wang Chu^1,2, Liu Chenxi^1,2, Wang Yong^1,2

1. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
2. Angang Steel Company Limited, Anshan Liaoning 114009, China

Received:2023-07-18 Revised:2023-10-14 Online:2023-12-25 Published:2024-01-29

摘要/Abstract

摘要： 研究了模拟焊后热处理工艺参数对Q370R钢板组织和力学性能的影响。结果表明,试验参数下的正火态Q370R钢板和模拟焊后热处理后得到的Q370R钢板组织均为铁素体+珠光体组织。模拟焊后热处理580 ℃×16 h(单次)和580 ℃×8 h(两次)钢板较正火态钢板晶粒度分别降低了1级和1.5级,带状物评级均降低1级;随着焊后热处理次数的增加和温度的升高,析出物发生粗化长大的趋势。随着模拟焊后热处理次数增多、模拟焊后热处理时间的延长,钢板强度降低,冲击吸收能量降低。580 ℃×16 h(单次)模拟焊后热处理钢板较正火态钢板抗拉强度、屈服强度和冲击吸收能量降低分别约50 MPa、30 MPa和40 J。580 ℃×8 h(两次)模拟焊后热处理钢板较正火态钢板抗拉强度、屈服强度和冲击吸收能量降低分别约50 MPa、45 MPa和45 J。580 ℃×16 h(单次)模拟焊后热处理钢板和580 ℃×8 h(两次)模拟焊后热处理钢板冲击吸收能量有离散现象,分析原因是成分偏析所致。

关键词: Q370R钢板, 模拟焊后热处理, 热处理工艺, 组织, 力学性能

Abstract: Effect of process parameters of simulated post-weld heat treatment (PWHT) on microstructure and mechanical properties of normalized Q370R steel plate was studied. The results show that the microstructure of the normalized Q370R steel plate and the Q370R steel plate treated by different PWHT processes is ferrite + pearlite. Compared with that of the normalized steel, the grain size of the steel plates treated by 580 ℃×16 h (single time) and 580 ℃×8 h (twice) processes is decreased by 1 and 1.5 grades, respectively, and the band grade is decreased by 1 grade. With the increase of PWHT times and temperature, the precipitates tend to coarsen and grow. As the number of simulated post-weld heat treatments increases and the simulated post-weld heat treatment time prolongs, the strength and the impact absorbed energy of the steel plate decrease. Compared with that of the normalized steel, the tensile strength, yield strength and impact absorbed energy of the 580 ℃×16 h treated steel are reduced by 50 MPa, 30 MPa and 40 J, respectively, and that treated by 580 ℃×8 h (twice) are reduced by about 50 MPa, 45 MPa and 45 J. The impact absorbed energy of the 580 ℃×16 h (single time) and the 580 ℃×8 h (twice) treated steel plates are scattered, which is analyzed to be caused by chemical segregation.

Key words: Q370R steel plate, simulated post-weld heat treatment, heat treatment process, microstructure, mechanical properties

中图分类号:

TG142.1

邢梦楠, 胡昕明, 欧阳鑫, 王储, 刘晨希, 王勇. 模拟焊后热处理工艺对压力容器用Q370R钢板组织与力学性能的影响[J]. 金属热处理, 2023, 48(12): 92-96.

Xing Mengnan, Hu Xinming, Ouyang Xin, Wang Chu, Liu Chenxi, Wang Yong. Effect of simulated post-weld heat treatment on microstructure and mechanical properties of Q370R steel plate for pressure vessel[J]. Heat Treatment of Metals, 2023, 48(12): 92-96.

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模拟焊后热处理工艺对压力容器用Q370R钢板组织与力学性能的影响

Effect of simulated post-weld heat treatment on microstructure and mechanical properties of Q370R steel plate for pressure vessel

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