N08800铁镍基合金热变形行为及组织演变

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在Gleeble-3800热模拟机上采用等温压缩实验研究了N08800铁镍基合金(/%:0.015C,20.8Cr,31.2Ni,0.42Al,0.35Ti)的高温压缩变形行为.获得合金在温度为1150~1280℃、应变速率为1~20 s-1条件下的真应力-真应变曲线.通过线性回归得到N08800合金的高温材料常数a为0.0092,n为4.34,热变形激活能Q为432780J/mol,建立了N08800合金的热变形峰值本构模型.结果 表明,N08800合金在热压缩变形过程中,高温低应变速率下,动态再结晶容易发生,其合适的热加工参数为1200~1250℃、应变速率1~10 s-1.生产实践表明,N08800合金1150℃初轧,粗轧道次压下率30% ~35%,终轧1000℃时5~6mm热轧卷边部质量良好.
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