论文部分内容阅读
研究了未充氢和热充氢沉淀强化奥氏体合金的拉伸断裂行为,分析了其氢脆敏感性与拉伸断裂行为间的联系,研究了氢对合金局部塑性变形及微裂纹形核的影响。结果表明:氢使沉淀强化合金由单一的韧窝断裂转变为韧窝断裂、沿晶断裂和滑移带开裂的混合断裂方式。其原因是:一方面,氢促进位错平面化滑移趋势、加剧局部塑性变形;另一方面,滑移带被晶界、孪晶界以及不同取向的滑移带所阻碍,引起了位错塞积和氢聚集。
The tensile fracture behavior of austenitic stainless steel under uncharged hydrogen and hot hydrogen precipitation precipitation was studied. The relationship between hydrogen embrittlement susceptibility and tensile fracture behavior was analyzed. The effects of hydrogen on the local plastic deformation and micro-crack nucleation Impact. The results show that hydrogen makes the precipitation strengthened alloy change from a single dimple fracture to a dimple fracture and a mixed fracture mode of intergranular fracture and slip band cracking. The reason is: on the one hand, hydrogen promotes the tendency of planar sliding of dislocations and aggravates the local plastic deformation; on the other hand, slip bands are hindered by grain boundaries, twin boundaries and slip bands with different orientations, causing dislocations Plugging and hydrogen accumulation.