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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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热老化对Z3CN20-09M不锈钢微区力学性能和冲击断裂行为的影响
DOI: 10.3724/SP.J.1037.2011.00023, PP. 751-756
Keywords: Z3CN20-09M不锈钢,热老化,冲击,断裂行为,力学性能
Abstract:
通过纳米力学探针对铁素体相在热老化过程中的力学性能变化进行了研究.采用仪器化冲击试验机研究了材料的冲击行为,使用SEM观察冲击断口形貌.结果表明长期热老化导致铁素体相的塑性变形能力不断下降,材料的冲击韧性也显著下降.热老化过程中冲击功的损失主要是由于裂纹扩展能量的降低引起,在400℃热老化1×104h后裂纹稳定扩展能几乎降为0.热老化材料的冲击断裂过程为在冲击载荷下裂纹首先在铁素体内萌生并快速扩展,铁素体相发生解理断裂,裂纹扩展到奥氏体相,最后裂纹连接贯穿整个试样
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