电化学充氢条件下TWIP钢应力腐蚀敏感性的研究  

Study on Stress Corrosion Sensitivity of TWIP Steel on the Electrochemical Hydrogen Charging Condition

作　　者：王励钊[1] 李春福[1] 曹文豪[1] 

机构地区：[1]西南石油大学,成都610500

出　　处：《表面技术》2012年第4期39-41,共3页Surface Technology

摘　　要：通过慢应变速率拉伸和观察断口形貌等方法,研究了TWIP钢在电化学充氢条件下的应力腐蚀敏感性。结果表明,在电化学充氢条件下,TWIP钢具有应力腐蚀敏感性。恒定应变速率6.67×10-6 s-1时,具有单向奥氏体结构的TWIP钢有较小的应力腐蚀敏感性,具有形变孪晶的TWIP钢有较高的应力腐蚀敏感性。这是因为孪晶的形成导致氢在局部浓度更高,因而促进了局部塑性变形,降低了内氢压,导致TWIP钢的应力腐蚀敏感性上升。By slow strain rate tensile and fracture morphology observation methods, the stress corrosion suscepti- bility of TWIP steel was studied in the electrochemical hydrogen charging. The results show that TWIP steel have stress corrosion sensitivity on hydrogen changed conditions. Under constrain strain rate of 6.67 × 10^-6 S ^-1 , with one-way austenitic structure TWIP steel have smaller stress corrosion sensitivity, deformation twinshave TWIP steel have a higher stress corrosion sensitivity. This is because the formation of the twin lead to the hydrogen has higher concentration in some areas, so it promotes the local plastic deformation, reduces the hydrogen pressure and increases the stress corrosion sensitivity of the TWIP steel.

关 键 词：TWIP钢 应力腐蚀开裂 应力腐蚀敏感性 氢脆 

分 类 号：TG172.83[金属学及工艺—金属表面处理]