锻造态316LN不锈钢在高温高压水中的短期氧化行为

发布时间：2018-03-10 12:56

本文选题：材料失效与保护　切入点：LN不锈钢　出处：《材料研究学报》2015年06期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The effects of forging and solution treatment after forging on the grain size, residual strain and grain orientation distribution of nuclear grade 316LN austenitic stainless steel have been studied by electron backscatter diffraction (EBSD). The morphology and composition of the oxide film on the surface of the original state (i.e. unforged state) and the wrought and solid solution treated state (316LNss) were analyzed after oxidation for 190 h in the high temperature and high pressure water of nuclear power plant. The solid solution treatment after forging and forging can reduce the grain size and residual strain, and eliminate the texture of the original state 316LNss. The oxide film formed on the surface of 316LNss in high temperature and high pressure water has double layer characteristics. The outer oxide film is composed of hydroxide and Fe-rich spinel structure oxide, the inner layer oxide film is mainly composed of Cr-rich spinel structure oxide, compared with the original state 316LNss, the oxidized film of wrought and solution-treated 316LNss is thinner and the Cr content is higher. The oxidation mechanism of 316 LNSS in high temperature and high pressure water was discussed.
【作者单位】：北京科技大学国家材料服役安全科学中心;中国科学院核用材料与安全评价重点实验室中国科学院金属研究所;
【基金】：国家科技重大专项课题2011ZX06004-009资助项目~~
【分类号】：TG142.71

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