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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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长期热老化对铸造奥氏体不锈钢组织和性能的影响
DOI: 10.3724/SP.J.1037.2010.00250, PP. 1186-1191
Keywords: 铸造奥氏体不锈钢,热老化,铁素体含量,力学性能
Abstract:
将铸造奥氏体不锈钢在400℃下时效至104h,通过力学性能测试和组织观察,分析了老化时间对力学性能和组织结构的影响.结果表明铁素体相的体积分数随老化时间没有变化;长期老化后材料的磁导率降低,同时铁素体相的纳米压入硬度增加;材料的Charpy冲击功随老化时间迅速下降,冲击断口形貌也随之不断变化;通过TEM观察发现,铁素体相在长期老化后析出了弥散的α'相和少量的G相,α'相是由铁素体发生调幅分解而生成的,是导致铸造奥氏体不锈钢热老化脆化的主要原因.
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