OALib Journal期刊
ISSN: 2333-9721
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统一黏塑性模型对9%-12%cr马氏体耐热钢低周疲劳特性的数值模拟
DOI: 10.3969/j.issn.1671-7627.2014.06.013, PP. 72-77
Keywords: 马氏体耐热钢,低周疲劳,chaboche模型,微观损伤
Abstract:
9%-12%cr马氏体耐热钢凭借其优异的综合性能,广泛应用于超超临界发电厂的主要部件。简要地概述了9%-12%cr钢在循环载荷作用下的微观损伤机制,将材料微观组织演化过程与统一chaboche黏塑性模型中内变量的变化相关联,应用chaboche模型预测9%-12%cr钢中p91钢,在500℃时不同应变幅值和不同应变速率条件下的循环应力-应变迟滞回线,将预测结果与已报道的试验数据进行比较,结果表明:不同条件下,该模型可以很好地预测p91钢的循环应力-应变迟滞回线,模型中运动硬化变量x描述材料在循环初期的应变强化现象,各向同性硬化变量r主要描述材料软化现象。
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