摘要
基于液化石油气球罐的安全性,选用线弹性断裂的力学方法,以16MnR钢材球罐为对象,利用改进处理后的M-WOL预裂纹试样,置于湿硫化氢条件下做应力腐蚀开裂试验,观察不同硫化氢浓度以及不同焊接状态条件下的应力腐蚀开裂。结果表明:随着硫化氢体积分数的减少,16MnR钢材应力腐蚀裂纹扩展速率降低;在一定硫化氢浓度范围内,裂纹发生在热影响区时,M-WOL试样所呈现出的裂纹扩展速率要明显大于裂纹发生在母材的情况。16MnR钢材为原料予以热处理能够在一定程度上抑制裂纹扩展速率,16MnR钢材母材抗应力腐蚀开裂性能强于热影响区的。
Based on the safety spherical tanks of LPG, the method of linear elastic fracture mechanics was used to analyze the stress corrosion cracking mechanisms of spherical tank steel 16 MnR in wet sulfide hydrogen environment.Improved M-WOL pre-cracked specimens were used to perform the stress corrosion cracking tests in different sulfide hydrogen concentrations and under different welding conditions. The results showed that with the reduction in the volume fraction of sulfide hydrogen, the stress corrosion crack growth rate of 16 MnR steel decreased. Within a range of concentrations of sulfide hydrogen, the crack occurred in the heat affected zone, the M-WOL specimen showed the crack growth rate was significantly higher than the crack happened in the condition of the parent metal. Heat treatment could suppress the crack growth rate of 16 MnR steel to a certain extent. The crack resistance of 16 MnR steel was much better than that of the heat affected zone.
出处
《焊接技术》
2017年第1期5-8,共4页
Welding Technology
基金
国家自然科学基金项目(51104134)
浙江省自然科学基金项目(LY14E040001)
关键词
湿硫化氢环境
16MNR钢
应力腐蚀开裂
焊接
热处理
wet sulfide hydrogen environment
16MnR steel
stress corrosion cracking
welding
heat treatment
