期刊论文

Flow Behavior and Processing Maps of FGH4096 Alloy Including High Strain Rate

中文

材料导报

1005-023X

2020

34

20

20123-20129

10.11896/cldb.19070069

16A220:湖南省教育厅重点项目 2017JJ2403:湖南省自然科学基金面上项目 2014207:湖南省高等学校科技创新团队支持计划 CX20192078:中南林业科技大学研究生科技创新项目

本校为第一机构

在变形温度为1 020~1 140 ℃、应变速率为0.001~10 s~(-1)的条件下,采用热压缩实验研究了热等静压态FGH4096合金的热变形行为并建立了热加工图。在应变速率为0.001~1.0 s~(-1)时,流变应力在达到峰值后开始减小。当应变速率为10 s~(-1)时,合金的的真应力-真应变曲线剧烈下降,这与试样开裂有关。随着变形温度的降低或应变速率的提高,合金的流变应力增大。当应变速率在1.0 s~(-1)以上时,由于流变应力迅速减小后又增大,合金的真应力-真应变曲线出现了双峰形态,这与高应变速率下滑移系开动和位错转变有关。真应变为0.3的热加工图中含有两个明显的动态再结晶区域,耗散率峰值位置分别为:( 1)变形温度1 ...

The hot flow behavior and processing maps of hot isostatic pressed powder metallurgy FGH4096 superalloy were studied at the temperature range of 1 020-1 140 ℃ and strain rate range of 0.001-10 s~(-1).The flow stress decrease after the rapid peak strain points and then smoothly transfer to the steady state during the strain rates of 0.001-1.0 s~(-1).As for the strain rate of 10 s~(-1),it demonstrates no steady state and the curves drop down sharply,which corresponds with the cracks of specimens.It is found that the flow stresses increase with d...