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| 预热处理对GH4698合金微观组织及性能的影响 |
| Effect of Pre-heat Treatment on Microstructure and Properties of GH4698 Alloy |
| Received:November 18, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.02.016 |
| 中文关键词: GH4698 预热处理 微观组织 力学性能 |
| 英文关键词: GH4698 pre-heat treatment microstructure mechanical properties |
| 基金项目:国家重点研发计划(2022YFB3706901，2022YFB3706903);湖北省重点研发计划(2022BAA024) |
| Author Name | Affiliation | | JIANG Quanan | State Key Laboratory of Materials Processing and Die & Mould Technology, School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | HUANG Liang | State Key Laboratory of Materials Processing and Die & Mould Technology, School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | LI Zhonghao | State Key Laboratory of Materials Processing and Die & Mould Technology, School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | BAN Yijie | State Key Laboratory of Materials Processing and Die & Mould Technology, School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | GAO Shoulei | Daye Special Steel Co., Ltd., Hubei Huangshi 435001, China |
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| 中文摘要: |
| 目的 针对锻后GH4698合金组织分布不均匀造成综合力学性能难以平衡的问题，提出通过预热处理来对合金的组织和性能进行优化，并深入探究不同预热处理制度对GH4698合金组织演化和性能的影响。方法 在标准四段式热处理之前增加预热处理实验(1 173~1 273 K，2~8 h)，观察不同预热处理条件下GH4698合金析出相尺寸和形貌，采用拉伸实验机与维氏硬度计获得不同预热处理条件下GH4698合金的力学性能，结合拉伸试样断口形貌，分析GH4698合金的断裂机制。结果 当预热处理温度为1 223 K时，合金内部大γ′相分布均匀，且小γ′相析出量达到峰值，尺寸为15~25 nm;在所研究的预热处理温度和时间范围内，GH4698合金的屈服强度、抗拉强度、延伸率和维氏硬度均呈现先上升后下降的趋势。GH4698合金的断裂形式为沿晶断裂+韧窝的混合断裂模式。结论 预热处理温度和时间对γ′相的形貌、尺寸及数量有着显著的影响，相较于未经预热处理的试样，最优的预热处理参数(1 223 K/4 h)下的合金屈服强度、抗拉强度、延伸率和维氏硬度分别提升了5.06%、5.48%、3.29%和10.30%。 |
| 英文摘要: |
| The work aims to propose a pre-heat treatment method to optimize the microstructure and properties of the alloy and delve into the influence of different pre-heat treatment regimes on the microstructural evolution and performance of GH4698 alloy, so as to address the challenge of unbalanced comprehensive mechanical properties resulting from uneven microstructure distribution in post-forged GH4698 alloy. Pre-heat treatment experiments (1 173-1 273 K, 2-8 h) were conducted prior to the standard four-step heat treatment. The size and morphology of the precipitated phases in GH4698 alloy under various pre-heat treatment conditions were observed. A tensile testing machine and a Vickers hardness tester were used to obtain the mechanical properties of GH4698 alloy under different pre-heat treatment conditions, and the fracture mechanisms were analyzed based on the fracture morphology of the tensile specimens. When the pre-heat treatment temperature was 1 223 K, the large γ′ phases were uniformly distributed within the alloy, accompanied by a peak precipitation of small γ′ phases with sizes ranging from 15 to 25 nm. Within the studied range of pre-heat treatment temperatures and times, the yield strength, tensile strength, elongation, and Vickers hardness of GH4698 alloy initially increased and then decreased. The fracture mode of the alloy exhibited a mixed mode of intergranular fracture and dimple fracture. In conclusion, the pre-heat treatment temperature and time significantly impact the morphology, size, and quantity of γ′ phases. Compared with untreated samples, the alloy under optimal pre-heat treatment parameters (1 223 K/4 h) shows improvements of 5.06%, 5.48%, 3.29%, and 10.30% in yield strength, tensile strength, elongation, and Vickers hardness, respectively. |
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