材料工程2025，Vol.53Issue(11)：63-71,9.DOI:10.11868/j.issn.1001-4381.2024.000346
超临界水反应器用GH4169合金服役后的微观组织和力学性能
Microstructure and mechanical properties of superalloy GH4169 for supercritical water reactor after service
摘要
Abstract
Microstructures and mechanical properties of GH4169 alloy cylinder and its weld joints in a supercritical water reactor are studied after operating 2000 h.The results show that the GH4169 alloy cylinder exhibits good corrosion resistance under conditions of high temperature,high pressure,and sucrose mixed solution;the thickness loss rate of the cylinder is 0.005-0.255 μm/h;the corrosion products primarily consist of oxides and phosphates.However,the welded joints connecting the cylinder and other components represent a vulnerable point that significantly impacts the remaining lifespan of the reactor.The calculated crack propagation rate of the GH4169 alloy cylinder is 5.25 μm/h,indicating that it would only take 762 h for the crack to penetrate through the wall of the connector.Additionally,severe fracture occurs(the circumferential length of the crack is approximately 1/4 of the circumference)at the weld joint between cylinder and stainless-steel,resulting from the synergistic effects of galvanic corrosion,crevice corrosion,and concentrated stress.Despite these challenges,the strength loss of the cylinder is relatively small,which means that the cylinder maintains satisfactory mechanical properties.关键词
超临界水氧化/GH4169合金/腐蚀速率/应力腐蚀开裂Key words
supercritical water oxidation/GH4169 superalloy/corrosion rate/stress corrosion cracking分类
矿业与冶金引用本文复制引用
刘刈,朱成,班子惠,李应举,冯亚鑫,张振涛,杨院生..超临界水反应器用GH4169合金服役后的微观组织和力学性能[J].材料工程,2025,53(11):63-71,9.基金项目
辽宁省应用基础研究计划项目(2023JH2/101300142) （2023JH2/101300142）
国家自然科学基金核技术创新联合基金(U226720033) （U226720033）
