热充氢对高镍S31603不锈钢拉伸性能的影响

Effect of Internal Hydrogen on Properties of S31603 Stainless Steel

采用热充氢方法对S31603不锈钢进行预充氢,随后在空气环境中对未充氢与热充氢试验钢进行不同温度下的慢应变速率拉伸试验,研究了热充氢对试验钢显微组织和拉伸性能的影响。结果表明:相同温度下,热充氢前后试验钢的强度、延伸率和断面收缩率均没有明显变化,热充氢对试验钢的塑性及强度无明显影响;不同状态试样的拉伸断口形貌均为韧窝状断裂,热充氢、温度变化不改变试验钢的断裂性质;充氢前后试验钢屈服强度、抗拉强度、延伸率均随着温度升高而降低,但断面收缩率保持稳定,且均在高温铁素体所在位置优先发生断裂。

The S31603 stainless steel was precharged with hydrogen by hot hydrogen charging method,and then it was subjected to slow strain rate tensile tests at different temperatures in air environment.By comparing the tensile properties and microstructure of S31603,the effect of internal hydrogen on the tensile properties of S31603 was studied.The results show that the strength,elongation and section shrinkage of S31603 do not change significantly before and after hot hydrogen charging at the same temperature,and the plasticity and strength of S31603 is not significantly affected by hot hydrogen charging.The tensile fracture morphology of samples in different states is dimple-like fracture,and the fracture properties of S31603 are not changed by hot hydrogen charging and temperature change.The yield strength,tensile strength and elongation of samples decrease with the increase of temperature,but the area shrinkage remains stable.In addition,it is found that there is preferential fracture phenomenon in the position of high-temperature ferrite.