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首页> 外文期刊>Materials Science and Engineering >Effect of powder preparation technology on the hot deformation behavior of HIPed P/M nickel-base superalloy FGH96
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Effect of powder preparation technology on the hot deformation behavior of HIPed P/M nickel-base superalloy FGH96

机译：粉末制备工艺对HIPed P / M镍基高温合金FGH96热变形行为的影响

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摘要

In this paper, the hot deformation characteristics of P/M nickel-base superalloy FGH96 prepared by different powder preparation technologies were studied in the deformation temperature range from 1000℃ to 1100℃ and the strain rate range from 0.001 s~(-1) to 1 s~(-1) using hot compression tests. The peak stress vs. deformation temperature curves and the peak stress vs. strain rate curves were established, respectively. The results show that the specimens prepared by plasma rotation electric pole (PREP) powder were more sensitive to deformation temperature and strain rate. On the basis of the dynamic material model, the processing maps for hot working were developed. The activation energies and Zener-Hollomon parameters were obtained by linear statistical regression method. For the specimens prepared by PREP powder, the peaks of power dissipation mainly located in lower temperature domain (1000-1030℃), and the efficiencies of power dissipation (EPD) obtained in the strain range from 0.1 to 0.7 were essentially similar. This indicated that strain had a slight influence on processing maps. For the specimens prepared by argon atomization (AA) powder, the effects of strain on EPD and instability domains were significant. The lower activation energies and Z values indicated that the workability of the specimens prepared by AA powder is better than that prepared by PREP powder. Moreover, it was found that effects of the heat treatment time on activation energy and Zener-Hollomon parameter were significant. With the increase of heat treatment time, the dislocation density and the volume fraction of precipitation phase gradually decreased. Microstructural observation demonstrated that the phenomenon of recrystallized grains coarsening existed in the specimens prepared by longer heat treatment time. The heat treatment time of the specimens prepared by AA powder should be appropriately shortened in order to prevent recrystallized grains coarsening.
机译：本文研究了不同粉末制备技术制备的P / M镍基高温合金FGH96的热变形特性，其变形温度范围为1000℃至1100℃，应变速率范围为0.001 s〜（-1）至1℃。使用热压缩测试1 s〜（-1）。分别建立了峰值应力-变形温度曲线和峰值应力-应变率曲线。结果表明，等离子旋转电极粉末制备的试样对变形温度和应变速率更敏感。在动态材料模型的基础上，绘制了热加工的加工图。通过线性统计回归法获得了活化能和齐纳-所罗门参数。对于由PREP粉末制备的样品，功率耗散的峰值主要位于较低的温度域（1000-1030℃），应变范围为0.1至0.7时获得的功率耗散效率（EPD）基本相似。这表明应变对加工图略有影响。对于用氩气雾化（AA）粉末制备的标本，应变对EPD和不稳定性域的影响非常明显。较低的活化能和Z值表明，AA粉末制备的样品的可加工性优于PREP粉末制备的样品。此外，发现热处理时间对活化能和齐纳-所罗门参数的影响是显着的。随着热处理时间的增加，位错密度和析出相的体积分数逐渐减小。显微组织观察表明，在较长的热处理时间下制备的试样中存在再结晶晶粒粗化的现象。为了防止再结晶晶粒粗大化，应适当缩短AA粉末制备的试样的热处理时间。

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