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材料工程  2013 

Ti-5Mo-5V-1Cr-3Al合金的热压缩变形行为研究

DOI: 10.3969/j.issn.1001-4381.2013.12.004, PP. 19-26

Keywords: Ti-5Mo-5V-1Cr-3Al合金,等温压缩,流变应力,应变诱发马氏体

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Abstract:

采用恒应变速率热压缩模拟实验,对Ti-5Mo-5V-1Cr-3Al(简称1Cr)钛合金在应变速率0.001~1s-1、变形温度700~900℃条件下进行研究。结果表明该材料的流变应力对温度与应变速率敏感当变形温度为700~800℃时,真应力-真应变曲线呈现动态再结晶单曲线特征;当变形温度为800~900℃时,低应变速率(0.001s-1)的真应力-真应变曲线呈现动态再结晶多应力峰值曲线特征,高应变速率(0.01~1s-1)的真应力-真应变曲线呈现动态回复曲线特征。1Cr合金在等温压缩变形时的流变行为可用包含Zener-Holomon参数的Arrhenius本构方程描述,变形激活能为456kJ/mol。金相结果显示,材料在热压缩过程中的动态行为除了与变形速率、变形温度等加工参数相关外,也与相应温度、变形速率下材料的组织及相结构有关。合金在低应变速率0.001s-1下热压缩变形时,在接近相变点或以上(800~900℃)温度范围内仍呈现动态再结晶行为,这与材料在此阶段发生的应变诱发马氏体转变密切相关,马氏体相的析出促使材料在热变形时趋向于发生动态再结晶行为。

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