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金属学报  2017, Vol. 53 Issue (11): 1469-1477    DOI: 10.11900/0412.1961.2017.00172
  研究论文 本期目录 | 过刊浏览 |
镍基粉末高温合金热加工变形过程中显微组织不稳定性对热塑性的影响
张明1,2, 刘国权1,2(), 胡本芙1
1 北京科技大学材料科学与工程学院 北京 100083
2 北京科技大学钢铁共性技术协同创新中心 北京 100083
Effect of Microstructure Instability on Hot Plasticity During Thermomechanical Processing in PM Nickel-Based Superalloy
Ming ZHANG1,2, Guoquan LIU1,2(), Benfu HU1
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
引用本文:

张明, 刘国权, 胡本芙. 镍基粉末高温合金热加工变形过程中显微组织不稳定性对热塑性的影响[J]. 金属学报, 2017, 53(11): 1469-1477.
Ming ZHANG, Guoquan LIU, Benfu HU. Effect of Microstructure Instability on Hot Plasticity During Thermomechanical Processing in PM Nickel-Based Superalloy[J]. Acta Metall Sin, 2017, 53(11): 1469-1477.

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摘要: 

采用单轴热压缩实验,研究了热等静压态镍基粉末高温合金FGH98的热加工变形行为。观察了形变过程中的合金组织演变,分析了显微组织不稳定性对热塑性的影响。热压缩实验在等温、恒应变速率下进行,真应变分别为0.2、0.4和0.6,温度分别为1060、1105、1138和1165 ℃,应变速率分别为0.01、0.1、1和10 s-1。结果表明,随着真应变的增加,合金的真应力-真应变曲线上出现硬化-软化-稳态流变阶段。在低于γ′相完全溶解温度、合金处在稳态流变或高应变条件下时,发生应变诱发动态再结晶并形成特殊形态的γ+γ′显微双相晶粒组织。晶粒尺寸细小,达到1.2~6.8 μm,合金显示良好的热塑性。分析了变形过程中晶粒尺寸和流变应力的变化和γ+γ′显微双相晶粒组织形成机理,并对热加工过程中显微组织调控的可能性进行讨论。

关键词 粉末高温合金热变形晶粒尺寸析出相    
Abstract

High alloying Ni-based powder metallurgy (PM) superalloys show excellent fatigue performance and damage tolerance properties, and good creep resistance at 750 ℃, and are used for advanced gas turbine disks and other hot components. The hot-working window of high alloying PM superalloy is narrow because of its poor workability. The formation of the γ+γ′ microduplex structure during the thermomechanical processing always results in a decrease in flow stress and a promotion of hot plasticity. However, the stability of the γ+γ′ microduplex structure has not been evaluated. The high temperature flow behavior of a Ni-based superalloy FGH98 prepared by hot isostatic pressing has been examined by means of uniaxial compression testing isothermally at 1060, 1105, 1138 and 1165 ℃ and at constant true strain rates between 0.01 and 10 s-1. The microstructural evolution and instabilities during plastic flow have been studied. Under all testing conditions, the as-hipped material exhibits flow hardening, flow softening and steady-state flow sequentially with the true strain increased. The dynamic recrystallization occurs and the γ+γ′ microduplex structures are generated when steady state flow or highest strains achieved at temperatures below the γ′ solvus. The formation of the γ+γ′ microduplex structures results in a remarkable decrease in grain size and a promotion of hot plasticity. The relationships between steady-state grain sizes and steady-state stresses during deformation and the formation mechanism of the γ+γ′ microduplex structure were analyzed. The possibility of the microstructure controlling during hot working was discussed.

Key wordsPM superalloy    hot deformation    grain size    precipitate
收稿日期: 2017-05-08     
ZTFLH:  TG132.32  
基金资助:国家高技术研究发展计划项目No.2015AA034201及国家自然科学基金项目No.51371030
作者简介:

作者简介 张 明,男,1988年生,博士生

图1  晶粒尺寸测量示意图
图2  热等静压态FGH98合金显微组织与γ′相形貌
图3  不同热变形条件下热等静压态FGH98合金的真应力-真应变曲线
图4  形变温度为1105 ℃、应变速率(ε˙)为1 s-1时,FGH98合金在不同真应变下的显微组织
图5  真应变为0.6、应变速率为1 s-1时,FGH98合金在不同形变温度下的显微组织
图6  真应变为0.6、形变温度为1105 ℃时,FGH98合金在不同应变速率下的显微组织
图7  γ+γ′显微双相晶粒组织的TEM像
图8  应变诱发γ-γ′相界面迁移导致γ′相的溶解、再析出和长大
图9  不同真应变的热加工图
图10  真应变对晶粒尺寸、真应力和功率耗散因子的影响
图11  形变温度对晶粒尺寸、稳态应力和功率耗散因子的影响
图12  稳态应力和和稳态晶粒尺寸的关系
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