核电站<strong>DMWJ</strong>中材料拘束的影响与优化

doi:10.11900/0412.1961.2019.00298

金属学报

2020, Vol. 56

Issue (6): 840-848 DOI: 10.11900/0412.1961.2019.00298

本期目录 | 过刊浏览

核电站DMWJ中材料拘束的影响与优化

杨杰(

), 王雷

上海理工大学能源与动力工程学院上海市动力工程多相流动与传热重点实验室上海 200093

Effect and Optimal Design of the Material Constraint in the DMWJ of Nuclear Power Plants

YANG Jie(

), WANG Lei

Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

引用本文:

杨杰, 王雷. 核电站DMWJ中材料拘束的影响与优化[J]. 金属学报, 2020, 56(6): 840-848.
Jie YANG, Lei WANG. Effect and Optimal Design of the Material Constraint in the DMWJ of Nuclear Power Plants[J]. Acta Metall Sin, 2020, 56(6): 840-848.

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摘要:

选用新一代核电安全端52M镍基合金异种金属焊接接头(DMWJ)为研究对象，以热影响区中危险位置为初始裂纹所在位置，系统研究了热影响区(HAZ)、熔合区(FZ)和近界面区(NIZ)材料拘束对DMWJ断裂行为的影响，并在此基础上对DMWJ各区域的材料拘束进行优化设计。结果表明，对于热影响区裂纹，当单独改变裂纹所在HAZ区域的强度时，J-R阻力曲线随着HAZ区域材料拘束失配系数(M_s)的增加而单调增加；当单独改变裂纹周边FZ或NIZ区域的强度时，J-R阻力曲线随着FZ或NIZ区域M_s的增加先增加后降低再不变。材料拘束优化后，DMWJ的J-R阻力曲线均明显高于实际DMWJ的J-R阻力曲线，同时改变3个区域的材料拘束失配系数，当M_s (HAZ):M_s (FZ):M_s (NIZ)=2:1.4:0.84时，得到了几倍于目前DMWJ的J-R阻力曲线。

关键词 ：材料拘束, 异种金属焊接接头, 断裂行为, 优化设计

Abstract：

The material constraint is an important factor affecting the fracture behavior of dissimilar metal welded joint (DMWJ). For accurately design, manufacture and structure integrity assessment, is necessary to clarify the influence of material constraint on the DMWJ. However, there is still a lack of a systematic research on the influence of material constraint on the fracture behavior of the DMWJ in the current nuclear power plants, and how to improve the fracture resistance of the DMWJ by the optimal design of the material constraint should be considered. In this work, a 52M nickel-based alloy DMWJ in nuclear power plants was selected, the initial crack which located in the heat affected zone (HAZ) was manufactured, and the fracture behaviors of the DMWJ under different material constraints of HAZ, fusion zone (FZ) and near interface zone (NIZ) were studied. In addition, the optimal design of the material constraint was investigated. The results show that for the HAZ crack, the J-resistance curves increase monotonously with increasing the strength of HAZ where the crack is located in. And the J-resistance curves increase firstly, then decrease and remain steady with increasing the strength of FZ and NIZ where the crack is nearby. The optimized DMWJs have higher J-resistance curves, and when M_s (HAZ): M_s (FZ):M_s (NIZ)=2:1.4:0.84, the optimized DMWJ has the highest J-resistance curve which is several times of the current J-resistance curve.

Key words： material constraint dissimilar metal welded joint fracture behavior optimal design

收稿日期: 2019-09-10

ZTFLH:

TH114

基金资助:国家自然科学基金项目(51975378);国家自然科学基金项目(51605292)

作者简介: 杨杰，男，1987年生，副教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00298 或 https://www.ams.org.cn/CN/Y2020/V56/I6/840

图1 异种金属焊接接头与核电压力容器接管嘴及安全端的连接示意图

图2 异种金属焊接接头及A508/52Mb界面附近子区域的细分

表1 异种金属焊接接头4种材料的化学成分[35] (mass fraction / %)

图3 异种金属焊接接头中所有材料及各子区域的真应力-真应变曲线

图4 SENB单边缺口弯曲试样的取样与尺寸示意图

表2 不同材料的Gurson-Tvergaard-Needleman (GTN)损伤参数[36]

图5 SENB单边缺口弯曲试样的整体网格与裂尖局部网格

图6 HAZ区域材料拘束改变对J-R阻力曲线与裂尖扩展路径的影响

图7 FZ区域材料拘束改变对J-R阻力曲线与裂尖扩展路径的影响

图8 材料拘束失配系数Ms=0.5时的裂纹扩展路径

图9 NIZ区域材料拘束改变对J-R阻力曲线与裂尖扩展路径的影响

图10 Ms=0.6时裂纹的扩展路径

图11 不同材料拘束优化设计所得到的J-R阻力曲线

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