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本文研究了45号钢的微观结构和氢脆之间的关系;观察分析了氢对位错运动、分布和结构的影响。本文认为,影响45号钢氢脆敏感性的本质因素是组织和第二相分布状况,而不是强度。充氢试样的塑性变形的主要微观机制为共面滑移,而位错的交叉滑移受到抑制,从而加剧了位错的塞积,其结果导致了位错分布和塑性变形的不均匀性,这是氢致断裂的特征。研究表明,氢脆准解理断口是由于氢促进共面滑移,而导致材料沿(或穿)马氏体条(束)界按照一定晶面断裂所造成的。
In this paper, the relationship between microstructure and hydrogen embrittlement of steel 45 was studied. The effect of hydrogen on dislocation motion, distribution and structure was observed and analyzed. This paper argues that the impact of 45 steel hydrogen embrittlement sensitivity of the essential factor is the distribution of the organization and the second phase, rather than the intensity. The main microscopic mechanism of plastic deformation of hydrogen-filled samples is coplanar slip, and the cross-slip of dislocations is suppressed, thus exacerbating the plugging of dislocations. As a result, dislocation distribution and plastic deformation inhomogeneity , Which is a feature of hydrogen induced fracture. The results show that the fracture of hydrogen-induced quasi-cleavage is caused by the hydrogen-promoted coplanar slip, which leads to the fracture of the material along (or through) the martensite bar.