利用Gleeble-1500热模拟机测试了Ti-6Al-4V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8.3×10-3/s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8.3×10-2/s-8.3×100/s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.
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