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用电子背散射衍射技术(EBSD)研究了锻造以及锻后固溶处理处理对核级316LN奥氏体不锈钢(316LNss)的晶粒尺寸、残余应变和晶粒取向分布的影响,并分析了原始态(即未锻造态)和锻造且固溶处理态316LNss在核电高温高压水中短期氧化(190 h)后表面氧化膜的形貌和成分。结果表明,锻造和锻后的固溶处理能减小晶粒尺寸和降低残余应变,同时消除了原始态316LNss内部的织构。在高温高压水中316LNss表面生成的氧化膜具有双层特征,外层氧化膜由氢氧化物和富Fe尖晶石结构氧化物组成,内层氧化膜主要由富Cr尖晶石结构氧化物组成;与原始态316LNss相比,锻造且固溶处理态316LNss的氧化膜较薄且Cr含量较高,氧化速率较小。最后讨论了316LNss在高温高压水中的氧化机理。
The effect of forging and forging solution treatment on the grain size, residual strain and grain orientation distribution of 316LNss stainless steel was investigated by electron backscatter diffraction (EBSD) (Ie, unwrought state) and forged and solution-treated 316LNss in the nuclear power high temperature and pressure water oxidation (190 h) after the surface oxide film morphology and composition. The results show that the solution treatment after forging and forging can reduce the grain size and reduce the residual strain, while eliminating the texture of the original 316LNss. The oxide film formed on the 316LNss surface in high temperature and high pressure water has a double-layer structure. The outer oxide film is composed of hydroxide and Fe-rich spinel structure oxide, and the inner oxide film is mainly composed of Cr-rich spinel structure oxide. Compared with the original 316LNss, forged and solution-treated 316LNss thinner oxide film and higher Cr content, the oxidation rate is small. Finally, the oxidation mechanism of 316LNss in high temperature and pressure water is discussed.