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锻造态316LN不锈钢在高温高压水中的短期氧化行为

Short-term Oxidation Behavior of Domestic Forged and Solution Annealed 316LN Stainless Steel in High Temperature PressurizedWater

中文摘要英文摘要

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。

Effect of forging on the average grain size, residue strain and grain orientation distribution of nuclear grade 316LN stainless steel (316LNss) was studied by means of electron back scattering diffraction (EBSD). The morphology and chemical composition of the oxide films formed on the as-received 316LNss as well as the forged and solution annealed 316LNss after immersion in borated and lithiated high temperature pressurized water at 300 oC for 190 h were also investigated. The results show that the average grain size was reduced and the residual strain was eliminated by forging and followed solution annealing. There were no obvious textures in the forged and solution annealed 316LNss. A two-layered oxide film grew on 316LNss after immersion in high temperature pressurized water. The outer layer composes of hydroxides and Fe-enriched spinal oxides and the inner layer composes of Cr-enriched spinal oxides. The forged and solution annealed 316LNss exhibited a lower oxidation rate rather than the as received ones due to the formation of a thinner and more Cr-enriched oxide film. The oxidation mechanism was also discussed.

王俭秋、郭跃岭、韩恩厚

10.12074/202303.00288V1

材料科学金属压力加工金属学、热处理

材料失效与保护316LN不锈钢氧化膜高温高压水锻造腐蚀核电

王俭秋,郭跃岭,韩恩厚.锻造态316LN不锈钢在高温高压水中的短期氧化行为[EB/OL].(2023-03-18)[2025-08-18].https://chinaxiv.org/abs/202303.00288.点此复制

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