TC4钛合金的热变形行为及其影响因素Behavior of Hot Deformation and its Effect Factors for TC4 Titanium Alloy
王清,李中华,孙东立,武高辉
摘要(Abstract)：
利用Gleeble1500热模拟机测试了Ti6Al4V合金在不同温度和不同应变速率下的真应力真应变曲线,观察热变形前后的组织,分析变形温度、应变速率、原始组织和热处理工艺对合金的热变形行为的作用及影响规律。结果表明,在应变速率为8.3×10-3s条件下,合金在600℃热变形时软化机制以动态回复为主,800℃至900℃热变形时软化机制以动态再结晶为主;700℃热变形时动态回复和动态再结晶可同时发生。淬火和时效可提高合金的热变形抗力。合金在600℃变形时,热变形抗力对在8.3×10-2s-8.3×100s范围变化的应变速率敏感性较差;当应变速率降至8.3×10-3s-1时,热变形抗力有较大幅度的降低。在相同的变形条件情况下,魏氏组织的流变应力高于等轴组织。
关键词(KeyWords)： Ti6Al4V钛合金;热压缩变形;显微组织
基金项目(Foundation): 国家自然科学基金资助项目(50371021)
作者(Author): 王清,李中华,孙东立,武高辉
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