| 引用本文: | 陈爽,王涛,付书红,田军.时效处理工艺对GH6783组织和性能的影响[J].材料科学与工艺,2026,(2):16-24.DOI:10.11951/j.issn.1005-0299.20240166. |
| CHEN Shuang,WANG Tao,FU Shuhong,TIAN Jun.Effect of aging treatment on microstructure and properties of GH6783 alloy[J].Materials Science and Technology,2026,(2):16-24.DOI:10.11951/j.issn.1005-0299.20240166. |
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| 摘要: |
| 为了获得具有良好组织与综合力学性能的低膨胀GH6783合金,本文开展了基于GH6783环锻件的热处理实验,并运用金相显微镜、扫描电子显微镜以及断口分析等方法,对不同二级时效热处理工艺下该合金的微观组织形貌和力学性能进行深入探究。结果表明:随着二级时效第1阶段加热温度的升高,晶内一次γ′相的数量及颗粒尺寸均呈现出明显增加的变化趋势,晶内二次γ′相的数量逐渐降低,且当二级时效第1阶段温度升高至780 ℃时,晶内仅析出一种尺寸较大的γ′相,随着二级时效第1阶段温度的升高,合金的强度、塑性与持久性能均呈现出先升高后降低的变化趋势,在二级时效第1阶段温度为720 ℃时,合金的室温与750 ℃拉伸强度达到最高值,且在该时效温度下合金的持久性能与拉伸塑性也较优异。表明合金在720 ℃进行二级时效第1阶段保温时,能够获得较优的组织与综合力学性能。 |
| 关键词: 高温合金 GH6783合金 时效处理 显微组织 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20240166 |
| 分类号:TG146.1 |
| 文献标识码:A |
| 基金项目: |
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| Effect of aging treatment on microstructure and properties of GH6783 alloy |
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CHEN Shuang1, WANG Tao1, FU Shuhong1, TIAN Jun2
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(1.Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2.Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China)
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| Abstract: |
| In order to achieve a low-expansion GH6783 alloy with favorable microstructure and comprehensive mechanical properties, heat treatment experiments were conducted on GH6783 ring forgings. Optical microscopy (OM), scanning electron microscope (SEM) analysis, and fracture analysis were employed to investigate the microstructure and mechanical properties of the alloy under various secondary aging heat treatment processes. The results show that with the increase in the heating temperature of the first stage in secondary-aging process, both the fraction and particle size of primary γ′ phases increase obviously, while the fraction of secondary γ′ phases decreases gradually. Notably, when the temperature of the first stage of secondary aging reaches 780 ℃, only one larger-sized γ′ phase precipitates within the crystal. With the increase of the first stage in secondary-aging temperature, the strength, plasticity and stress-rupture life of the alloy show an initial increase followed by a decrease. At a temperature of 720 ℃ during the first stage of secondary aging, the tensile strength at room temperature and at 750 ℃ reaches its maximum, while the durability and tensile plasticity of the alloy are also notably superior at this aging temperature. This suggests that maintaining the alloy at 720 ℃ during the first stage of secondary aging can yield optimal microstructure and comprehensive mechanical properties. |
| Key words: superalloy GH6783 alloy aging treatment microstructure evolution mechanical properties |
