Study on mechanism of grain boundary embrittlement of austenitic stainless steel after irradiation using in-situ monitoring system of grain boundary separation

晶界分离原位监测系统研究奥氏体不锈钢辐照后晶界脆化机理

• 批准号: 24656563
• 负责人: HASEGAWA Akira
• 金额: $ 2.58万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656563/
• 关键词: 原子力材料・核燃料; ヘリウム脆化; 変形のその場観察; 変形その場観察; 原子力材料・核燃料; ヘリウム脆化; 変形のその場観察; 変形その場観察

Helium embrittlement of austenitic stainless steel by tensile mode was investigated though grain boundary observation of solution-annealed and He-implanted Fe-15Cr-20Ni at high temperature. The following results were obtained. Grain boundary separation appeared during the elastic deformation area at 923 and 1023K. The separated grain boundaries were observed only after yielding tested at 823K, and these were not observed below 723K. These separated grain boundaries were random or higher grain boundaries and their direction was near perpendicularly to the stress direction. With increasing plastic strain, separated grain boundaries of lower sigma boundaries were observed. With increasing the applied strain, separated grain boundaries were linked and formed grain boundary cracks and before the specimen rupture. In-situ observation system for surface crack formation during tensile test was designed and manufactured, and the analysis of deformation mode is under investigated.

尽管在高温下对溶液的溶液边界观察到了溶液的溶液边界观察，但通过拉伸模式研究了奥氏体不锈钢的氦覆盖。获得以下结果。晶粒边界分离出现在弹性变形区域923和1023K时。仅在823K下测试后才能观察到分离的晶界，并且在723K以下未观察到这些边界。这些分离的晶界是随机或更高的晶界，它们的方向垂直于应力方向。随着塑性应变的增加，观察到了较低的西格马边界的分离晶界。随着施加应变的增加，分离的晶界与样品破裂之前和样品破裂之前。设计和制造了在拉伸试验期间进行表面裂纹形成的原位观察系统，并研究了变形模式的分析。