摘要
通过高温高压C型环试验方法研究了国产690TT与800合金传热管在苛性钠溶液中的应力腐蚀开裂(SCC)行为。研究结果表明,在300℃饱和氧10%NaOH溶液中,690TT传热管与800合金传热管在局部位置发生沿晶/穿晶应力腐蚀开裂(IG/TGSCC),裂纹向纵深发展,生长速率分别达到0.059 mm/a、0.076 mm/a;在300℃饱和氧30%NaOH溶液中,690TT传热管与800合金传热管未发生应力腐蚀开裂,腐蚀形态主要为均匀腐蚀+晶间侵蚀(IGA)混合模式,690TT管最大均匀腐蚀速率为0.060 mm/a,IGA深度为20~30μm,综合腐蚀速率达到0.112 mm/a;800合金管最大均匀腐蚀速率为0.350 mm/a,IGA深度为10μm,综合腐蚀速率达到0.367 mm/a。
The stress corrosion cracking(SCC)behavior of domestic 690TT and 800 alloy heat transfer tubes in the caustic sodium solution was studied by high temperature and high pressure C-ring test method.The results show that in the saturated oxygen 10%NaOH solution at 300℃,the 690TT and the 800 alloy heat-transfer tubing have intergranular/transgranular stress corrosion cracking(IG/TGSCC)at local locations,and the crack develops in depth,and the growth rate reaches 0.059 mm/a, 0.076 mm/a respectively;in 300 ℃ saturated oxygen30% NaOH solution, the 690TT heat transfer tube and the 800 alloy heat transfer tube did nothave stress corrosion cracking phenomenon, and the corrosion form was mainly uniformcorrosion + intergranular attack (IGA) mixed mode. The maximum uniform corrosion rate of690TT tubing is 0.060 mm/a, the depth of IGA is 20~30 μm, and the comprehensive corrosionrate is 0.112 mm/a;for the 800 alloy tubing, the maximum uniform corrosion rate is 0.350mm/a, the IGA depth is 10 μm, and the comprehensive corrosion rate reaches 0.367 mm/a.
作者
施慧烈
但体纯
罗垚
汪潇
王先元
SHI Huilie;DAN Tichun;LUO Yao;WANG Xiao;WANG Xianyuan(Research Institute of Nuclear Power Operation,China National Nuclear Corporation(CNNC),Wuhan of Hubei Prov.430223,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2023年第5期1079-1089,共11页
Nuclear Science and Engineering
