氢与应力联合作用下2.25Cr-1Mo钢回火脆性实验研究

Effect of Hydrogen and Stress on Temper Embrittlement of 2.25Cr-1Mo Steel

应用俄歇电子能谱实验及晶界偏聚理论分析了应力、氢、应力与氢联合作用对加氢反应器母材2.25Cr-1Mo钢的回火脆化影响以及三者之间的关系。实验结果表明,应力对2.25Cr-1Mo钢回火脆化具有一定的抑制作用,而氢对回火脆化具有促进作用,随着回火脆化程度的增加,应力、氢对回火脆化的影响逐渐增强;应力与氢对回火脆化的影响机理是降低或增加了杂质原子P晶界偏聚量,二者联合作用下2.25Cr-1Mo钢的回火脆化程度近似等于应力与氢单独作用引起回火脆化度的改变量的线性叠加。

The effect of stress and hydrogen,and the combined effect of stress and hydrogen on temper embrittlement of 2.25Cr-1Mo steel used in hydrogenation reactor were analyzed by Auger electron spectrometer testing and the grain boundary segregation theory,as well as their relationship.The experimental results indicate that stress restrains temper embrittlement of 2.25Cr-1Mo steel,but hydrogen promote it,and the influence strengthens gradually with the degree of temper embrittlement increase.The effect mechanism of stress and hydrogen on the temper embrittlement is that reduces or increases the grain boundary of impurity element P,and the temper embrittlement degree of 2.25Cr-1Mo steel on the combined effect of stress and hydrogen approximately equals to the linear superposition of the effect of stress and hydrogen alone.