李梦飞,张立文,张驰,申文飞,顾森东

• 1:大连理工大学材料科学与工程学院

摘要(Abstract)：

采用Gleeble-1500热模拟实验机对Nimonic 80A高温合金进行了双道次热压缩实验,研究了该合金在变形温度1050~1150℃,应变速率0.01~2.5 s-1,预应变0.08~0.14,不同间隙时间(0.5~5 s)下的静态再结晶行为。得到了Nimonic 80A高温合金不同变形条件下的真应力-应变曲线及变形后奥氏体晶粒组织,分析了变形温度、应变速率和预应变对该合金静态再结晶行为的影响。结果表明:变形温度、应变速率和预应变对Nimonic 80A高温合金的静态再结晶行为有着显著的影响。Nimonic 80A高温合金静态软化分数随着变形温度、应变速率和预应变的增大而增大,且静态再结晶晶粒尺寸随着温度的升高或应变速率的降低而增大。根据实验结果,建立了Nimonic 80A高温合金静态再结晶动力学模型。将静态再结晶动力学模型预测结果和实验结果进行比较,二者吻合良好,表明本文提出的模型可以较为准确的预测Nimonic 80A高温合金静态软化行为。

关键词(KeyWords)： Nimonic 80A高温合金;静态再结晶;静态软化;双道次热压缩实验

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李梦飞,张立文,张驰,申文飞,顾森东

DOI: 10.13289/j.issn.1009-6264.2016.10.033

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