摘要
采用扫描电镜、动电位极化曲线和慢应变速率试验研究了TP439不锈钢的组织形貌及其在高温高压水中的应力腐蚀开裂行为。结果表明:TP439不锈钢的微观组织为典型的铁素体等轴晶粒,晶内分布有一定数量的细小碳化物;3.5%(质量分数)NaCl溶液中,其腐蚀电位为-0.25V(SCE,下同),点蚀电位约为0.18V;三种温度条件下铁素体不锈钢的慢应变拉伸曲线相似,断口形貌主要为韧性断口;温度对铁素体不锈钢在高温高压水中应力腐蚀行为无明显影响,TP439不锈钢在此环境中的应力腐蚀敏感性较低。
The microstructure and stress corrosion cracking （SCC） behavior of TP439 ferrite stainless steel in high temperature and high pressure water were studied by scanning electron microscopy, potentiodynamic polarization curve, energy dispersive spectra and slow strain rate test （SSRT）. The results showed that the microstructure of TP439 ferrite stainless steel presented ferritic grains and the particles of fine carbide were distributed; the potential of TP439 stainless steel in 3.5% NaCl was -0.25 V （SCE）, and the pitting potential was 0. 18 V（SCE）. The stress vs strain curves of TP439 stainless steel at different temperatures were similar and their fracture morphology was ductile fracture. Temperature had no obvious effect on SCC and the TP439 stainless steel had the low susceptibility to SCC in high temperature and high pressure water.
出处
《腐蚀与防护》
CAS
北大核心
2016年第9期723-726,共4页
Corrosion & Protection
基金
国家自然科学基金(U1260201)
关键词
铁素体不锈钢
高温高压水
应力腐蚀开裂
断口形貌
ferritic stainless steel
high temperature and high pressure water
stress corrosion cracking
fracture morphology
