超细晶挤压态FGH4113A高温合金等温锻造过程中的本构特性及组织演变
Constitutive Characterization and Microstructure Evolution of As-extruded FGH4113A Superalloy with Ultrafine Grain During Isothermal Forging
李远 1何英杰 1马向东 1杨金龙 2肖磊 1郭建政 3冯干江4
作者信息
- 1. 深圳市万泽中南研究院有限公司,广东深圳 518000
- 2. 深圳市万泽中南研究院有限公司,广东深圳 518000;深圳市万泽航空科技有限责任公司,广东深圳 518000;中南大学粉末冶金研究院,湖南长沙 410083
- 3. 深圳市万泽中南研究院有限公司,广东深圳 518000;中南大学粉末冶金研究院,湖南长沙 410083
- 4. 深圳市万泽中南研究院有限公司,广东深圳 518000;深圳市万泽航空科技有限责任公司,广东深圳 518000
- 折叠
摘要
锻造是先进航空发动机粉末涡轮盘制备的关键成型工艺.合金的化学成分和挤压工艺很大程度上决定了挤压态合金的组织.新型镍基粉末高温合金FGH4113A(WZ-A3)热挤压之后晶粒度达到13级以上,挤压态合金呈现γ+γ'双相组织.细小均匀的双相组织为更为广阔的等温锻造工艺窗口提供可能.本研究采用超细晶挤压态合金FGH4113A进行温度分别为1000、1040、1080和1120 ℃,应变速率为0.001、0.01和0.1 s-1的Gleeble热压缩试验,压缩量为60％.结果表明合金试样在所有压缩条件下均未发生开裂,体现超细晶挤压态合金FGH4113A有广阔的等温锻造工艺窗口.合金的平均激活能仅为515.375 kJ/mol.低应变速率下(0.001 s-1),试样真应力-真应变曲线呈现出稳态流变特性;高应变速率下(0.1s-1),试样的真应力-真应变曲线呈现出加工硬化到再结晶软化的变化.γ'相对变形温度敏感,高的变形温度会引发γ'相的溶解而导致再结晶晶粒的长大.此外,超细晶挤压态合金FGH4113A在等温锻造过程中主要再结晶方式为不连续动态再结晶.本研究为超细晶挤压态合金FGH4113A的锻造工艺制定提供了实验依据.
Abstract
Forging is the key forming process for producing advanced aero-engine powder turbine disks.The microstructure of as-extruded alloy mostly depends on the chemical composition of alloy and extrusion processing parameters.The average grain size number is greater than 13 for the novel powder nickel-based superalloy FGH4113A after hot extrusion,and the as-extruded alloy has dual-phase microstructure of γ+γ'.The fine and homogeneous dual-phase microstructure makes it possible to broaden isothermal forging processing window.In this study,Gleeble hot compression experiments for as-extruded FGH4113A alloy with ultrafine grains were carried out at temperatures of 1000,1040,1080,1120 ℃ and strain rates of 0.001,0.01,0.1 s-1.Height reduction was 60％for samples under all experiment conditions.The results show that no crack is found on the surface of alloy samples under all experiment conditions,suggesting that the as-extruded FGH4113A alloy with ultrafine grains has a wide isothermal forging process window.The average activation energy for the alloy is 515.375 kJ/mol.True stress-true strain curves show a steady flow characteristic for samples under low strain rate(0.001 s-1)and the change from work hardening to recrystallization softening for the samples under high strain rate(0.1 s-1).γ'is sensitive to temperature,and recrystallization grains grow obviously at high deformation temperature due to the dissolution of a large amount of γ'.Furthermore,the main recrystallization way is discontinuous dynamic recrystallization for as-extruded FGH4113A alloy with ultrafine grains.This study offers experiment evidence for forging processing design of the as-extruded FGH4113A alloy with ultrafine grains.
关键词
超细晶/热挤压/FGH4113A/高温锻造/组织演变Key words
ultrafine grain/hot extrusion/FGH4113A/isothermal forging/microstructure evolution引用本文复制引用
基金项目
国家科技重大专项(2017-Ⅵ-0009-0080)
深圳市工业和信息化局项目(201806071114243770)
深圳市科技创新委员会项目(20150128085205453)
广东省珠江人才计划(607264877417)
出版年
2024
NETL
NSTL
万方数据