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利用等温热压缩模拟试验机,对难变形高温合金GH4720Li初始均匀细晶合金不同温度及应变速率下的变形行为研究,计算了判定合金超塑性变形范围的应变速率敏感因子m及对相应变形组织进行分析。结果表明,均匀细晶合金在1040~1130℃、0.0001~0.005 s-1变形区间内,m值随变形温度升高和变形量增加而降低;1040~1100℃、0.0001~0.005 s-1条件下,该细晶合金具有超塑变形的能力,而1130℃时,无论应变速率如何,该合金已经不具备超塑性变形的能力;均匀细晶合金在较高变形温度下最佳超塑性变形所对应的应变速率较高,低温变形时最佳超塑性变形发生需要更低的应变速率。
The isothermal hot compression simulation test machine was used to study the deformation behavior of the initial uniform fine grained superalloy GH4720Li under different temperatures and strain rates. The strain rate sensitivity factor m for determining the superplastic deformation range of the alloy was calculated, Analyze. The results show that the m value decreases with the increase of deformation temperature and the increase of deformation at 1040 ~ 1130 ℃ and 0.0001 ~ 0.005 s-1 at 1040 ~ 1130 ℃ and 0.0001 ~ 0.005 s-1 , The fine-grained alloy has the ability of superplastic deformation, and at 1130 ° C, the alloy no longer has the ability of superplastic deformation no matter the strain rate; the optimal superplastic deformation of uniform fine-grained alloy corresponds to Of the high strain rate, low temperature deformation of the best superplastic deformation occurs when the need for lower strain rate.