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| GH6159合金成分−组织−性能关联研究 |
| Relationship Between Composition, Microstructure and Properties of GH6159 Alloy |
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| DOI：10.3969/j.issn.1674-6457.2023.07.019 |
| 中文关键词: GH6159合金 合金成分 高温拉伸 室温拉伸 显微组织 |
| 英文关键词: GH6159 alloy alloy composition high-temperature tensile test room-temperature tensile test microstructure |
| 基金项目:国防基础科研计划(JCKYS2020213003) |
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| 中文摘要: |
| 目的 研究不同成分GH6159合金冷拉态和热处理态显微组织的变化情况，分析不同成分对合金室温和高温拉伸性能的影响规律，为GH6159合金成分优化与性能提升提供理论指导。方法 基于MP159合金成分，设计熔炼了4种不同成分的GH6159合金，经锻造开坯和热轧，进行了拉伸率为48%的冷拉变形和663 ℃/4 h的时效热处理，分别制成冷拉态和热处理态GH6159棒材，采用MTS 8810拉伸实验机进行室温和595 ℃的高温拉伸测试，获得了不同成分合金冷拉态和热处理态的室温和595 ℃高温拉伸性能，结合OLYMPUS−PM3光学显微镜和Tescan Mira 3 XMU扫描电子显微镜观察了显微组织的变化情况。结果 GH6159冷拉态棒材内存在大量的变形孪晶，热处理态组织内析出了弥散分布的强化相，合金拉伸性能主要受到基体元素和强化相元素的影响。结论 较高含量的Co、Cr、Ni基体元素有利于提高冷拉态GH6159合金的室温和高温拉伸强度，而Al、Ti、Nb强化相元素会提高热处理态GH6159合金的室温拉伸强度，但过高的Ti元素会降低合金强度，一定含量的Al、Ti、Nb元素有利于提高冷拉态和热处理态合金的高温塑性。 |
| 英文摘要: |
| The work aims to observe and study the microstructural variation of cold-drawn and heat-treated GH6159 alloy with different compositions, analyze the effect of different compositions on the tensile properties at room temperature and high temperature, and provide theoretical guidance for composition optimization and performance enhancement of GH6159 alloy. Based on the compositions of MP159 alloy, four GH6159 alloys with different compositions were designed and melted. After forging cogging and hot rolling, cold-drawn deformation with an elongation of 48% and aging treatment at 663 ℃/4 h were respectively carried out to prepare cold-drawn and heat-treated GH6159 bars. The tensile properties of the cold-drawn and heat-treated GH6159 bars with different compositions were tested at room temperature and high temperature of 595 ℃ with an MTS 8810 tensile tester to obtain the tensile properties, and the microstructure variation was observed with an OLYMPUS-PM3 optical microscope and a Tescan Mira 3 XMU scanning electron microscope. There were a large number of deformed twins in GH6159 cold-drawn bars. Dispersed strengthening phases were precipitated in the heat-treated alloy. The tensile properties of the alloy were mainly affected by the matrix elements and strengthening phase-forming elements. It is concluded that high content of Co, Cr and Ni matrix elements is beneficial to improve the room-temperature and high-temperature strength of the cold-drawn alloy. In contrast, Al, Ti and Nb strengthening phases could improve the room-temperature tensile strength of the heat-treated alloy. However, too high content of Ti element could reduce the strength of the alloy. A specific content of Al, Ti and Nb elements is beneficial to the high-temperature plasticity of cold-drawn and heat-treated alloy. |
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