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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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β－γ高Nb－TiAl合金准等温锻造过程模拟
DOI: 10.3724/SP.J.1037.2013.00518, PP. 1439-1444
Keywords: β－γ,高Nb－TiAl合金,准等温锻造,Deform－3D模拟,等效应力应变场,临界损伤因子
Abstract:
采用Deform－3D有限元软件模拟了β－γ高Nb－TiAl合金Ti－45Al－8.5Nb－0.2W－0.2B－0.02Y(原子分数,%)的准等温锻造过程,分析了合金内部等效应力场、等效应变场、温度场的分布以及结合热压缩实验确定了该合金在特定工艺参数下的临界损伤因子.结果表明,随应变速率的增大,锻件的温度损失不明显,等效应力增大,最大等效应变值增加,变形均匀性系数下降,工件变形更加均匀.结合模拟和实验结果,确定了β－γ高Nb－TiAl合金在1150℃,应变速率5×10-2s-1条件下进行包套准等温锻造过程中的临界损伤因子为0.206.
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