【摘要】 研究了氢在2(1/4)Cr-1Mo钢中对四点弯曲缺口试样裂纹萌生和扩展的影响,发现氢使裂纹萌生的应变值降低,而对裂纹萌生和扩展的微观机理没有影响.氢的主要作用是促进裂纹萌生和扩展初期沿滑移带方向的微孔聚合过程.裂纹扩展后期,由于氢在对称面的偏聚促进了微孔的产生,从而使微孔聚合过程从滑移带转移到该面上.更多还原

【Abstract】 The role of hydrogen in the process of crack initiation and propagation for four point bending specimen of 21/4Cr-1Mo steel was studied. The results were found that the plastic strain for initial cracking was reduced by hydrogen, but the mechanism for crack initiation and propagation didn’t changed. The main role of hydrogen is to accelerate initial cracking and promote the process of microvoid cocalence along characteristic slip bands in the early period of crack propagation. In the later period of crack propagation, the process of micro old cocalence is transfered from characteristic slip bands to symmetry plane due to the accumulation of hydrogen atoms.更多还原