锻压技术

GH2907高温合金热加工工艺窗口的建立与验证

英文标题：Establishment and verification on hot working process window for superalloy GH2907

单位：西安建筑科技大学西北工业大学贵州安大航空锻造有限责任公司沈阳黎明航空发动机（集团）有限责任公司

分类号：TG316.3

出版年,卷(期):页码：2022,47(8):224-234

摘要：

为了确定GH2907高温合金的最佳等温热变形工艺参数，采用近等温热压缩实验及热变形后固溶实验分析了合金在不同热力学参数（温度及应变）下的组织演变规律，建立了GH2907高温合金的热加工工艺窗口（再结晶晶粒的百分比窗口和晶粒尺寸极差窗口）。结果表明：当变形温度越高、等效应变越大时，再结晶晶粒的百分比越大，晶粒尺寸极差先增大后减小；锻后随着固溶温度的升高，组织中的晶粒逐渐均匀化，1040 ℃×1 h固溶处理后，在相同变形温度时，不同等效应变处的组织呈现出匀晶状态。根据热加工工艺窗口得知，选择高温小变形（变形温度为1020 ℃、等效应变为0.4和980 ℃×1 h固溶处理）的工艺参数可获得较为均匀的组织。通过模拟环轧成形及环轧实验生产出的环件中各位置的组织较均匀，验证了热加工工艺窗口的准确性。

In order to determine the optimal isothermal thermal deformation process parameters for superalloy GH2907, the microstructure evolution laws of the alloy under different thermodynamic parameters (temperature and strain) were analyzed by the near isothermal thermal compression experiment and solution experiment after hot deformation, and the hot working process window was established (recrystallized grains percentage window and grain size range window). The results show that with the increasing of deformation temperature and equivalent strain, the percentage of recrystallized grains increases, and the range of grain size increases first and decreases afterwards. With the increasing of solution temperature after forging, the grains in the microstructure are gradually homogeneous, and after the solution treatment of 1040 ℃ × 1 h, the microstructure at different equivalent strains presents a homogeneous state at the same deformation temperature. According to the hot working process window, the relatively uniform microstructure can be obtained by selecting the process parameters of high temperature and small deformation (the deformation temperature of 1020 ℃, the equivalent strain of 0.4 and the solution treatment of 980 ℃×1 h). The structure in each position of the ring part produced by simulating the ring rolling and the ring rolling experiments shows a uniform state, which verifies the accuracy of the hot working process window.

基金项目：

国家自然科学基金资助项目（51504195）；陕西省重点研发项目(2017ZDXM-GY-027)

作者简介：陈益哲（1992-），男，硕士，E-mail：957698190@qq.com

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