热力发电2024，Vol.53Issue(11)：162-168,7.DOI:10.19666/j.rlfd.202405105
氯离子质量浓度对Inconel 740H合金应力腐蚀开裂性能的影响
Effect of chloride ion mass concentration on stress corrosion cracking performance of Inconel 740H alloy
摘要
Abstract
The effect of chloride ion mass concentration(0,1,20 mg/L)on stress corrosion cracking of Inconel 740H,a candidate nickel based alloy for high parameter ultra-supercritical units at 630～700℃,were investigated by slow strain rate tensile testing and stress corrosion crack propagation testing.Moreover,the relevant mechanism of high mass concentration chloride ions promoting the initiation and propagation of stress corrosion cracks was explored.The results showed that,high mass concentration of chloride ions promoted the stress corrosion cracking of 740H alloy,and the stress corrosion sensitivity index Iscc(δ)of the alloy increased with the chloride ion mass concentration.When the mass concentration of chloride ions increased to 20 mg/L,both the middle and edge of the fracture exhibited intergranular brittle fracture characteristics,with a large number of secondary intergranular cracks near the fracture.At this point,the alloy experienced stress corrosion cracking.The average crack propagation rate in a 20 mg/L chloride ion water environment reached 1.15×10-6 mm/s,which is 111.7 times the average crack propagation rate in high-purity water.关键词
Inconel 740H/应力腐蚀开裂/氯离子/慢应变速率拉伸/裂纹扩展Key words
Inconel 740H/stress corrosion cracking/chloride ion/slow strain rate tensile/crack propagation引用本文复制引用
李江,崔雄华,杨哲一,唐丽英,周荣灿,李季,王军民..氯离子质量浓度对Inconel 740H合金应力腐蚀开裂性能的影响[J].热力发电,2024,53(11):162-168,7.基金项目
陕西省自然科学基础研究计划项目(2023-JC-QN-0582) Natural Science Basic Research Program of Shaanxi Province(2023-JC-QN-0582) （2023-JC-QN-0582）
