超超临界火电机组异种钢焊接接头高温断裂机理综述

doi:10.3901/JME.2022.24.058

机械工程学报 ›› 2022, Vol. 58 ›› Issue (24): 58-83.doi: 10.3901/JME.2022.24.058

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超超临界火电机组异种钢焊接接头高温断裂机理综述

康举^1,2, 王启冰¹, 王智春³, 韩哲文³, 左月¹, 张华¹, 焦向东^1,2

1. 北京石油化工学院机械工程学院北京 102617;
2. 北京石油化工学院能源工程先进连接技术北京市高等学校工程研究中心北京 102617;
3. 华北电力科学研究院有限责任公司北京 100045

收稿日期:2022-03-20 修回日期:2022-09-20 出版日期:2022-12-20 发布日期:2023-04-03
通讯作者: 焦向东(通信作者),男,1962年出生,博士,教授。主要研究方向为焊接自动化、水下/压力环境下焊接工艺与设备。E-mail:jiaoxiangdong@bipt.edu.cn
作者简介:康举,男,1983年出生,博士,副教授。主要研究方向为异种金属焊接。E-mail:kangju@bipt.edu.cn;焦向东(通信作者),男,1962年出生,博士,教授。主要研究方向为焊接自动化、水下/压力环境下焊接工艺与设备。E-mail:jiaoxiangdong@bipt.edu.cn
基金资助:
国家自然科学基金（52175286）、北京市自然科学基金（3194048）、先进焊接与连接国家重点实验室开放课题研究基金（AWJ-21M13）、先进成形制造教育部重点实验室开放课题基金（202102）、清华大学高端装备界面科学与技术全国重点实验室开放基金（SKLTKF20B16）、北京石油化工学院交叉科研探索（BIPTCSF-004）和北京石油化工学院重要科研成果培育（BIPTACF-009）资助项目。

A Review on High Temperature Rupture Mechanisms of Dissimilar Metal Welded Joints for the USC Thermal Power Units

KANG Ju^1,2, WANG Qibing¹, WANG Zhichun³, HAN Zhewen³, ZUO Yue¹, ZHANG Hua¹, JIAO Xiangdong^1,2

1. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617;
2. Beijing Higher Institution Engineering Research Center of Energy Engineering Advanced Joining Technology, Beijing Institute of Petrochemical Technology, Beijing 102617;
3. North China Electric Power Research Institute Co., Ltd., Beijing 100045

Received:2022-03-20 Revised:2022-09-20 Online:2022-12-20 Published:2023-04-03

摘要/Abstract

摘要： 我国现役超超临界（Ultra-supercritical，USC）火电机组锅炉受热面管系中有大量由铁素体耐热钢与镍基合金/奥氏体耐热钢构成的异种钢焊接接头（Dissimilar metal welded joints，DMWJs）。生产实践表明，大量的DMWJs在服役7万～10万h后发生早期失效，使用寿命远低于设计寿命30年或20万h。DMWJs早期开裂事故的频发，不仅对机组的安全运行造成极大危害，而且给发电企业带来了巨大的经济损失和负面的社会影响，同时也反映了当前对异种钢焊接，尤其是DMWJs高温服役性能的认识仍存在不足。为深入解析DMWJs的早期失效原因，回顾并总结了国内外近20年对9-12% Cr钢/镍基合金、9-12% Cr钢/奥氏体耐热钢DMWJs在高温蠕变、高温疲劳等高温力学性能方面的研究结果；分别从环境温度、加载应力、DMWJs的热力学特性、焊接残余应力、微观组织演变等方面，总结了不同因素对DMWJs高温断裂模式和断裂特征的影响，详细阐述了DMWJs在高温蠕变和疲劳条件下的断裂机理，归纳了当前较流行的高温断裂损伤物理模型及其发展应用。最后，本文建议了两种较为有效的可改善接头高温力学性能的方法，并对未来的研究方向进行了建议和展望。

关键词: 异种钢焊接接头, 早期失效, 高温蠕变, 高温疲劳, 断裂机理

Abstract: There are numerous dissimilar metal welded joints (DMWJs) composed of ferrite heat-resistant steel and austenitic heat-resistant steel/nickel-based alloy in the boiler heating surface pipe system of ultra-supercritical (USC) thermal power units in China. The productive practices demonstrate that most of the DMWJs have early failure after service for 70 000-100 000 hours, and their service life is far less than the design life of 30 years or 200 000 hours. The frequent occurrence of early cracking accidents of DMWJs not only causes great harm to the safe operation of the unit, but also suffers great economic losses and negative social effects to the power generation enterprises. Meanwhile, it also reflects that the current understanding about weldability of dissimilar metals, especially the high temperature service performance of DMWJs, is still insufficient. In order to further reveal the early failure reasons of DMWJs, this work reviewed and summarized the research results of high temperature mechanical properties of 9-12%Cr/Nickel superalloy and 9-12% Cr/Austenitic dissimilar welded joints under high temperature creep and high temperature fatigue around China and other countries in the past two decades. The effects of various factors on the high temperature failure modes and failure characteristics of DMWJs were summarized through the ambient temperature, loading stress, thermodynamic characteristics, welding residual stress, microstructural evolution, et al. The fracture mechanisms of DMWJs under high temperature creep and fatigue conditions were expounded in detail, and it was also introduced a considerable of currently popular physical models about high temperature fracture damage and their development and application. Finally, it was proposed that two effective methods to improve the high temperature mechanical properties of DMWJs, and prospected for the relative researching trend in future.

Key words: dissimilar metal welded joints, early failure, high-temperature creep, high-temperature fatigue, facture mechanisms

中图分类号:

TG407

康举, 王启冰, 王智春, 韩哲文, 左月, 张华, 焦向东. 超超临界火电机组异种钢焊接接头高温断裂机理综述[J]. 机械工程学报, 2022, 58(24): 58-83.

KANG Ju, WANG Qibing, WANG Zhichun, HAN Zhewen, ZUO Yue, ZHANG Hua, JIAO Xiangdong. A Review on High Temperature Rupture Mechanisms of Dissimilar Metal Welded Joints for the USC Thermal Power Units[J]. Journal of Mechanical Engineering, 2022, 58(24): 58-83.

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超超临界火电机组异种钢焊接接头高温断裂机理综述

A Review on High Temperature Rupture Mechanisms of Dissimilar Metal Welded Joints for the USC Thermal Power Units

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