锻压技术

GH4738合金热加工工艺窗口的表征与验证

英文标题：Characterization and verification on hot working process windows for GH4738 alloy

单位：航空工业贵州安大航空锻造有限责任公司西北工业大学中国航发沈阳黎明航空发动机有限责任公司陕西宏远航空锻造有限责任公司

分类号：TG316.3

出版年,卷(期):页码：2021,46(5):207-215

摘要：

为了研究GH4738合金的热变形特性，选用锥形试样采用近等温热压缩实验获得了GH4738合金不同热力学参数（温度、应变）下经过1020 ℃固溶后的组织，研究了GH4738合金不同热力学参数下的组织演变规律。通过对不同热力学参数条件下合金晶粒（主要包括再结晶小晶粒的百分比和晶粒尺寸极差）的研究，建立了GH4738合金热加工工艺窗口。通过对GH4738合金热加工工艺窗口的分析得出，在GH4738合金变形过程中要想获得较为均匀的组织，宜采取高温小变形（温度应高于1030 ℃，应变应小于0.5）或大变形（应变应在2.0以上）的变形方案。最后，采用模锻成形验证了热加工工艺窗口的准确性。

In order to study the hot deformation characteristics of GH4738 alloy, for the conical specimens, the microstructures of GH4738 alloy after solid solution at 1020 ℃ under different thermodynamic parameters (temperature and strain) were obtained respectively by near isothermal hot compression test, and the microstructure evolution of GH4738 alloy under different thermodynamic parameters was studied. Then, the hot working process window of GH4738 alloy was established by studying the grain sizes (mainly including the percentage of recrystallized small grains and the range of grain size) under different thermodynamic parameters. Through the analysis of the hot working process window of GH4738 alloy, if the more uniform microstructure during the deformation process of GH4738 alloy was obtained, the deformation scheme of high temperature and small deformation (the temperature should be higher than 1030 ℃, and the strain should be less than 0.5) or large deformation (the strain should be more than 2.0) should be adopted. Finally, the accuracy of the hot working process window was verified by die forging.

基金项目：

陕西省自然科学基础研究计划资助项目(2020JQ-182)；中央高校基本科研业务费专项资金项目(3102019ZX004)

王龙祥（1985-），男，硕士，高级工程师 E-mail：sonilgtcl@163.com 通讯作者：王建国（1987-），男，博士，助理研究员 E-mail：jianguow@nwpu.edu.cn

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