FGH96合金双道次热变形及其热加工图

发布时间：2018-04-03 14:54

本文选题：高温合金　切入点：双道次　出处：《工程科学学报》2015年03期

【摘要】：采用Gleeble-1500热模拟试验机对FGH96合金进行双道次真应变量为0.6+0.6和0.3+0.9的等温间断热压缩试验,研究了变形温度为1050~1125℃、变形速率为0.001~0.1 s-1时合金的热变形行为和组织演变.热变形过程中合金发生了再结晶,第一道次较小的真应变量减轻了合金的开裂.当第一道次真应变量小时,随着温度和变形速率的上升,合金道次间再结晶软化率增加.不同应变量以及不同道次真应变量均对合金热加工图产生明显影响.在相同变形条件下,当能量耗散率随应变量的增加而下降时,合金中组织由细晶向粗晶转变,反之则由粗晶向细晶转变;当能量耗散率不随应变量的变化而变化时,能量耗散率低于20%的合金中出现大量的不完全再结晶组织,能量耗散率高于35%的合金中出现细小完全再结晶组织.
[Abstract]:On FGH96 alloy by double pass really should be variable for the 0.6+0.6 and 0.3+0.9 continuous isothermal hot compression test using the Gleeble-1500 thermal simulation testing machine, the deformation temperature of 1050~1125, the deformation rate of 0.001~0.1 S-1 alloy hot deformation behavior and microstructure evolution during hot deformation. The alloy recrystallization occurred, the first. The true strain reduced alloy cracking. When the first true strain hours, with the rise of the temperature and strain rate, alloy Interpass recrystallization softening rate increased. The variables and different pass variables are really should have a significant impact on the processing of the alloy. Different under the same deformation conditions, when the energy dissipation rate increases with the increase of strain decreases when the change in the alloy organized by fine grain to coarse grain, and vice versa by coarse to fine grain change; when the energy dissipation rate does not change with the strain energy. A large number of incomplete recrystallized structures appear in the alloy with a dissipation rate of less than 20%, and the fine and complete recrystallized microstructure appears in the alloy with energy dissipation rate higher than 35%.

【作者单位】：北京科技大学材料科学与工程学院;北京航空材料研究院;
【基金】：国家重点基础研究发展计划资助项目(2010CB631204)
【分类号】：TG132.3

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