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本文用阴极选择方向充氢法研究了261超纯铁素体不锈钢和300M低合金超高强度钢冷轧板材的织构与氢脆方向性的关系。用冲击试验衡量脆性,用倒极图法测定板材三个方向的织构,用扫描电镜观察表面和断口形貌。结果证实冷轧板材的氢脆有明显的方向性,平行轧向的方向,充氢敏感性最强;垂直轧向的方向,充氢敏感性最弱。利用氢的位错短路通道扩散模型解释氢脆的方向性,得到了满意的结果。以的织构系数表示某方向上的位错线露头分布份数,则在位错密度相等条件下,〔P〕_E值与冲击值损失率成直线关系。因此取向集中在〈110〉,〈211〉和〈321〉方向的织构,氢脆更敏感。〔P〕_E值是氢脆控制因素之一。
In this paper, the relationship between the texture and hydrogen embrittlement direction of 261 ultra-pure ferritic stainless steel and 300M low-alloy ultra-high strength steel cold-rolled sheet was investigated by hydrogenation method with cathodic selective direction. The brittleness was measured by the impact test, the texture of the plate in three directions was determined by the inverted graph method, and the surface and the fracture morphology were observed by scanning electron microscopy. The results show that cold-rolled sheet of hydrogen embrittlement obvious direction, parallel to the direction of rolling, hydrogen charging sensitivity of the strongest; vertical rolling direction, charging hydrogen weakest sensitivity. The hydrogen dislocation short-circuit channel diffusion model was used to explain the directionality of hydrogen embrittlement, and satisfactory results were obtained. The texture coefficient represents the distribution of outcrop of dislocation lines in a certain direction. Under the condition of equal dislocation density, the value of [P] _E has a direct relationship with the loss of impact value. Therefore, the texture oriented in the <110>, <211> and <321> directions is more sensitive to hydrogen embrittlement. The [P] _E value is one of the control factors for hydrogen embrittlement.