高温高压下超声冲击改善S30408焊接接头抗氟离子应力腐蚀性能  

Improvement of Fluoride Stress Corrosion Resistance of S30408 Welded Joints by Ultrasonic Impact under High Temperature and High Pressure

作　　者：周新[1] 谭伟[1] 杨新俊 夏强[1] ZHOU Xin;TAN Wei;YANG Xinjun;XIA Qiang

机构地区：[1]江苏省特种设备安全监督检验研究院常熟分院 [2]江南大学机械工程学院

出　　处：《化工装备技术》2018年第5期1-5,共5页Chemical Equipment Technology

基　　金：南京市质量技术监督局系统重点科技项目(KJ2015001)

摘　　要：通过实验研究了在高压高温环境下,超声冲击处理对S30408不锈钢焊接接头抗氟离子应力腐蚀性能的影响。结果表明:随着温度的升高和氟离子质量浓度的降低,S30408焊接接头的应力腐蚀开裂敏感性降低;冲击处理能够有效提升S30408焊接接头抗应力腐蚀开裂性能,同时也增加了S30408焊接接头的点蚀倾向。在280℃的环境下,焊接接头出现一定程度的应力松弛现象;随着实验温度升高,应力松弛程度显著增加,有效降低了材料的位错密度和腐蚀敏感性。The effect of ultrasonic shock treatment on the resistance of S30408 stainless steel welded joints to stress corrosion by fluoride ion under high pressure and high temperature was studied experimentally. The results showed that the stress corrosion cracking sensitivity of S30408 welded joints decreased with the increase of temperature and the decrease of fluoride ion concentration. The impact treatment could effectively improve the stress corrosion cracking resistance of S30408 welded joint, and also increase the pitting corrosion tendency of S30408 welded joint. Under the condition of 280℃, the stress relaxation phenomenon of welded joints was observed. With the increase of test temperature, the degree of stress relaxation increases remarkably, which effectively reduces the dislocation density and corrosion sensitivity of the material.

关 键 词：超声冲击处理 氟离子 应力腐蚀 高温高压 S30408不锈钢 

分 类 号：TG142.71[一般工业技术—材料科学与工程]