摘要
采用慢应变速率应力腐蚀方法,研究了化工压力容器用钢在不同温度和不同浓度NaOH碱性溶液中的应力腐蚀行为,并对断口形貌进行了观察。结果表明,在腐蚀介质浓度和应变速率相同的前提下,溶液温度的升高会使得压力容器用钢的断后伸长率和抗拉强度逐渐降低,同时会使压力容器用钢的应力腐蚀断裂时间逐渐缩短。在腐蚀溶液温度和应变速率相同的前提下,腐蚀介质浓度的提高会使试样的断后伸长率降低,同时应力腐蚀断裂时间逐渐缩短。在高温NaOH碱性溶液中化工压力容器用钢发生了沿晶和穿晶开裂,断口中还可见明显的腐蚀产物。
The stress corrosion behaviors of concentrations of NaOH alkaline solution were chemical pressure vessel steel in different temperature and different investigated by slow strain rate stress corrosion method, and the fracture morphology was observed. The results show that the concentration of corrosion medium and strain rate under the condition of the same solution temperature, the elongation and tensile strength of pressure vessel steel will decrease gradually, at the same time, the pressure vessel steel stress corrosion fracture time will be shortened. Under the same corrosion solution temperature and strain rate, the increase of the concentration of corrosive will reduce the break elongation of samples, the pressure vessel steel stress corrosion fracture time will be shortened, too. In high temperature NaOH alkaline solution chemical pressure vessel steel will be cracking by intergranular and transgranular, the corrosion products can be obviously found in the fracture.
作者
李会云
张小迪
LI Huiyun1, ZHANG Xiaodi2(1. Department of Chemical Engineering, Yan＇an Vocational and Technical College, Yan＇an 716000, China; 2. Chang＇an University, School of Materials Science and Engineering, Xi＇an 710064, Chin)
出处
《铸造技术》
CAS
2018年第3期723-726,共4页
Foundry Technology
关键词
压力容器
奥氏体不锈钢
应力腐蚀
应变速率
断口形貌
pressure vessel, austenitic stainless steel, stress corrosion, strain rate, fracture morphology
