采用Gleeble-15 00D热加工模拟试验机及微观组织分析系统研究了热加工参数对GH738合金动态再结晶组织分布的影响规律.结果表明:影响GH738合金动态再结晶晶粒分布均匀性的主要因素是变形量,当变形量大于50％且接近70％时更易获得较均匀的再结晶组织.变形速度及温度对动态再结晶也有一定的影响:变形速率减小,变形温度升高,再结晶体积分数提高;变形速率增大,变形温度降低都导致再结晶晶粒的体积分数减小.进一步的电镜分析表明,GH738合金动态再结晶的形核机制以应变诱发形核为主.
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