热处理工艺对核电主蒸汽超级管道管嘴力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.11.024

金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 156-160.DOI: 10.13251/j.issn.0254-6051.2023.11.024

热处理工艺对核电主蒸汽超级管道管嘴力学性能的影响

郭彦辉, 邓冬, 张跃, 慎英才, 王岩

生态环境部核与辐射安全中心, 北京 102488

收稿日期:2023-09-06 修回日期:2023-10-10 出版日期:2023-11-25 发布日期:2023-12-27
通讯作者: 王岩,工程师,硕士,E-mail:Wangyan@chinansc.cn
作者简介:郭彦辉(1982—),男,高级工程师,博士,主要研究方向为先进焊接技术、金属材料性能评价、核安全设备审评,E-mail:guoyh2005@163.com。

Effect of heat treatment process on mechanical properties of super pipe nozzle for nuclear power plant

Guo Yanhui, Deng Dong, Zhang Yue, Shen Yingcai, Wang Yan

Nuclear and Radiation Safety Center, Beijing 102488, China

Received:2023-09-06 Revised:2023-10-10 Online:2023-11-25 Published:2023-12-27

摘要/Abstract

摘要： 研究了性能热处理(Performance heat treatment,PHT)与模拟焊接热处理(Simulated welding heat treatment,SWHT)工艺对顶拔锻造工艺生产的P280GH钢超级管道管嘴力学性能的影响及作用机理。采用光学显微镜、扫描电镜以及能谱分析仪研究了不同热处理工艺对显微组织的影响,并开展了室温与300 ℃高温拉伸、0 ℃冲击、布氏硬度测试等力学试验。结果表明,PHT热处理后和PHT+SWHT热处理后管嘴的微观结构均主要由铁素体和珠光体两相组成,但经PHT后珠光体主要分布在铁素体晶界处,而经PHT+SWHT后珠光体有球化趋势,而且在铁素体内部亦有珠光体形成。经PHT后的管嘴试样拉伸性能与未经热处理的母材性能基本一致,平均冲击吸收能量高于母材约15 J;而PHT+SWHT热处理后管嘴室温拉伸性能比母材性能平均下降约18 MPa,平均冲击吸收能量下降了约20 J。研究表明,顶拔锻造工艺制造的管嘴显微组织中珠光体的分解与球化是不同热处理工艺试样力学性能变化的主要原因。

关键词: 核电, 超级管道, P280GH钢, 性能热处理, 模拟焊接热处理

Abstract: Effect and mechanism of performance heat treatment (PHT) and simulated welding heat treatment (SWHT) on mechanical properties were investigated for the P280GH steel super pipe nozzles produced by top-drawing process. Effects of different heat treatments on the microstructure were studied by means of optical microscope, scanning electron microscope and energy dispersive spectroscope, and the mechanical tests such as tensile tests at room temperature and 300 ℃, impact test at 0 ℃, Brinell hardness test were carried out. The results show that after PHT or PHT+SWHT, the microstructure of the nozzles are mainly composed of two phases of ferrite and pearlite. However, after PHT, the pearlite appears mainly at the grain boundary of ferrite, while after PHT+SWHT, the pearlite has a tendency of spheroidization, and there is some pearlite inside the ferrite. The tensile properties of the PHT nozzle specimens are basically the same as that un-heat-treated main pipe, but its average impact absorbed energy is higher by about 15 J. The tensile properties of the PHT+SWHT nozzle specimens are reduced by about 18 MPa compared to that un-heat-treated main pipe, and the average impact absorbed energy is reduced by about 20 J. It is shown that fracture and spheroidization of the pearlite in the microstructure of the super pipe nozzle produced by top-drawing are the main causes of changes in the mechanical properties of the specimens with different heat treatments.

Key words: nuclear power, super pipe, P280GH steel, performance heat treatment, simulated welding heat treatment

中图分类号:

TG162

郭彦辉, 邓冬, 张跃, 慎英才, 王岩. 热处理工艺对核电主蒸汽超级管道管嘴力学性能的影响[J]. 金属热处理, 2023, 48(11): 156-160.

Guo Yanhui, Deng Dong, Zhang Yue, Shen Yingcai, Wang Yan. Effect of heat treatment process on mechanical properties of super pipe nozzle for nuclear power plant[J]. Heat Treatment of Metals, 2023, 48(11): 156-160.

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热处理工艺对核电主蒸汽超级管道管嘴力学性能的影响

Effect of heat treatment process on mechanical properties of super pipe nozzle for nuclear power plant

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