核用SA508-4N钢粗晶区再热裂纹敏感性评价

doi:10.11901/1005.3093.2018.290

材料研究学报

2019, Vol. 33

Issue (1): 72-80 DOI: 10.11901/1005.3093.2018.290

研究论文

本期目录 | 过刊浏览

核用SA508-4N钢粗晶区再热裂纹敏感性评价

陈重毅,麻永林(

),邢淑清,白庆伟,刘永珍

内蒙古科技大学材料与冶金学院包头 014010

Reheat Cracking Susceptibility in Coarse Grained Heat-affected Zone of SA508-4 Steel for Nuclear Pressure Vessel

Zhongyi CHEN,Yonglin MA(

),Shuqing XING,Qingwei BAI,Yongzhen LIU

Material and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou 014010, China

引用本文:

陈重毅,麻永林,邢淑清,白庆伟,刘永珍. 核用SA508-4N钢粗晶区再热裂纹敏感性评价[J]. 材料研究学报, 2019, 33(1): 72-80.
Zhongyi CHEN, Yonglin MA, Shuqing XING, Qingwei BAI, Yongzhen LIU. Reheat Cracking Susceptibility in Coarse Grained Heat-affected Zone of SA508-4 Steel for Nuclear Pressure Vessel[J]. Chinese Journal of Materials Research, 2019, 33(1): 72-80.

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摘要:

采用等温恒速拉伸方法评价了核用SA508-4N钢焊接粗晶区(CGHAZ)的再热裂纹敏感性。使用激光共聚焦、扫描电镜和透射电镜观测和分析粗晶区和断口处的组织、裂纹以及断口形貌，结果表明：SA508-4N钢的母材为回火马氏体，较高含量的碳和铬影响碳化物的大小和分布状态，粗晶区马氏体的形成不利于抑制再热裂纹的产生。碳化物的析出使晶内和晶界的强度不同，当晶内强度大于晶界强度时形成沿晶脆性断裂；当晶内和晶界强度的差距较小时断裂形式包括穿晶和沿晶断裂。SA508-4N钢粗晶区对再热裂纹不敏感，成分A粗晶区的抗再热裂纹能力比成分B的高。在实际生产中，优选的工艺参数为：成分A、焊接t_8/5为25 s、焊后热处理温度580℃。

关键词 ：金属材料, 再热裂纹, 焊接热模拟, 反应堆压力容器, 显微组织, 力学性能

Abstract：

The reheat cracking susceptibility of the coarse-grained heat affected zone (CGHAZ) of SA508-4N steel for nuclear pressure vessel was evaluated by stress-rupture tests at high temperature. The microstructure of the CGHAZ and base metal (BM), as well as the crack- and fracture- morphology were characterized by means of Laser confocal microscope, scanning electron microscopy and transmission electron microscopy. The results show that the microstructure of base metal is tempered martensite, while carbon and chromium content can affect the size and distribution of carbides. The formation of martensite in CGHAZ is not conducive to the suppression of reheat cracking. The precipitation of carbides causes the difference in the strength for grain and grain boundary. When the strength of grain is greater than that of grain boundary, intergranular brittle fracture could emerge. However, when the strength difference between the grain and grain boundary is small, both of the transgranular- and intergranular-fractures could occur. The CGHAZ of SA508-4N steel is not sensitive to reheat cracking, and the resistance to reheat cracking in the CGHAZ of steel A is better than that of Steel B. It follows that the optimum parameters in the actual welding for steel A are as follows: the welding t_8/5 is 25 s, and the post weld heat treatment temperature is 580^oC.

Key words： metallic materials reheat cracking welding thermal simulation reactor pressure vessel microstructure mechanical properties

收稿日期: 2018-04-24

ZTFLH:

TG407

基金资助:国家科技重大专项子课题(2009ZX04014-064-05);内蒙古自治区自然科学基金(2016MS0510)

作者简介: 陈重毅，男，1983年生，讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.290 或 https://www.cjmr.org/CN/Y2019/V33/I1/72

表1 SA508-4N钢的化学成分

图1 等温恒速试验方案

图2 拉伸试样的示意图

图3 SA508-4的显微组织

图4 SA508-4N钢粗晶区的显微组织

图5 粗晶区和母材的高温抗拉强度、断面收缩率和伸长率与热处理温度的关系

图6 不同参数条件下钢断口处的裂纹

图7 不同参数条件下钢裂纹扩展处的空洞

图8 不同参数条件下钢的断口形貌

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