焊管2026，Vol.49Issue(8)：64-69,6.DOI:10.19291/j.cnki.1001-3938.2026.08.007
新型17Cr4Ni2Mo1Cu三相不锈钢硫化物应力腐蚀开裂行为研究
Study on SSC Behavior of Novel 17Cr4Ni2Mo1Cu Triplex Stainless Steel
摘要
Abstract
The stress corrosion cracking(SSC)behavior of a novel 17Cr4Ni2Mo1Cu triplex stainless steel in acidic H2S enviroment was investigated in response to the demand for deep and high H2S environment in oil and gas extraction.The solution treatment process was determined via phase diagram calculation using Thermo-Calc software.The microstructure of the steel was characterized by X-ray diffraction(XRD)and electron backscatter diffraction(EBSD).SSC tests under constant load were performed in accordance with the NACE TM0177 Standard Method A,and the failure mechanism was analyzed through fracture morphology and cross-sectional crack analysis.The results show that the tested steel exhibits a high yield strength of 970 MPa but it undergoes brittle fracture within a short period of time in a harsh SSC environment.Fracture observation and secondary crack analysis on cross-sections demonstrate that cracks mainly propagate along martensitic regions,while the ferrite phase presents excellent resistance to sulfide stress corrosion.During crack propagation,the crack tip deflects when encountering ferrite grains and tends to extend along ferrite grain boundaries or propagate continuously via martensitic channels.The significant electrochemical corrosion difference between martensite and ferrite phases serves as the core driving factor for crack initiation and early propagation.Moreover,the ferrite phase and its grain boundaries can hinder and guide the propagation of crack tips,which substantially affects the propagation mechanism and growth rate of SSC cracks.关键词
三相不锈钢/硫化氢应力腐蚀开裂/微观组织/裂纹扩展/电化学差异Key words
triplex stainless steel/SSC/microstructure/crack propagation/electrochemical difference分类
矿业与冶金引用本文复制引用
幸雪松,杨芝乐,郑蔚茹,何松,岳小琪,张雷..新型17Cr4Ni2Mo1Cu三相不锈钢硫化物应力腐蚀开裂行为研究[J].焊管,2026,49(8):64-69,6.基金项目
中国海洋石油有限公司综合科研项目"高温动态腐蚀环境演化与经济型油套管防腐技术研究"(项目编号KJZH-2024-2301). （项目编号KJZH-2024-2301）
