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| 不同热处理制度对Ni30合金显微组织演变的影响 |
| Effect of Different Heat Treatment Technologies on the Microstructure Evolution in Ni30 Alloy |
| Received:July 30, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.10.008 |
| 中文关键词: Ni30合金 热处理制度 显微组织 析出行为 |
| 英文关键词: Ni30 alloy heat treatment process microstructure precipitation behavior |
| 基金项目:重庆市技术创新与应用发展重点专项(CSTB2023TIAD-KPX0021);国机集团科学技术研究院有限公司科研专项(SINOMAST-KYZX-2023-03);中国机械工业集团有限公司青年科技基金项目(QNJJ-ZD-2023-03) |
| Author Name | Affiliation | | WU Wei | Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China
National Engineering Research Center for Instrument Functional Materials, Chongqing 400707, China
Chongqing Key Laboratory of Corrosion-resistant Alloys, Chongqing 400707, China | | CHEN Lei | Guangzhou Bureau of Marine Equipment, Chongqing 400010, China | | LIU Haiding | Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China
National Engineering Research Center for Instrument Functional Materials, Chongqing 400707, China
Chongqing Key Laboratory of Corrosion-resistant Alloys, Chongqing 400707, China | | ZHANG Jieke | College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China | | CAO Yu | College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China | | WANG Dongzhe | Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China
National Engineering Research Center for Instrument Functional Materials, Chongqing 400707, China
Chongqing Key Laboratory of Corrosion-resistant Alloys, Chongqing 400707, China | | DONG Haipeng | Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China
National Engineering Research Center for Instrument Functional Materials, Chongqing 400707, China
Chongqing Key Laboratory of Corrosion-resistant Alloys, Chongqing 400707, China | | WAN Hong | Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China
National Engineering Research Center for Instrument Functional Materials, Chongqing 400707, China
Chongqing Key Laboratory of Corrosion-resistant Alloys, Chongqing 400707, China |
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| 中文摘要: |
| 目的 探究不同固溶和时效热处理制度对Ni30合金微观组织演化的影响规律，为制定和优化Ni30合金热处理制度提供指导。方法 将电镦件上所取样品在950、1 000、1 020和1 050 ℃下进行保温30 min后水冷的固溶处理，以及720 ℃保温4 h后空冷的时效处理。基于优选的固溶热处理制度，在700、720、740、760和780 ℃下分别进行2、4和24 h保温后空冷的时效处理。结合JMatPro数值模拟，采用扫描电子显微镜、透射电子显微镜和电子背散射衍射仪等手段，研究Ni30合金的显微组织演变。结果 在同一时效制度下，随着固溶温度的升高，大尺寸晶粒逐步吞噬周围的细小晶粒从而发生长大，Σ3n(n=1, 2, 3)晶界比例明显增大，共格孪晶界变得更加笔直细长，析出相以NbC、TiC、Cr23C6等为主。在同一固溶热处理制度下，时效温度的升高会促进晶粒尺寸的增加和γ′强化相的析出，能够有效阻碍位错的迁移运动;时效时间的延长能够促进晶粒尺寸的小幅增加和纳米尺度γ′、Cr23C6等二次碳化物复合强化相的析出。结论 Ni30合金电镦件推荐采用的固溶热处理制度为1 020 ℃×30 min+水冷，时效热处理工艺制度为720 ℃×4 h+空冷，在此条件下能够获得较好的显微组织。 |
| 英文摘要: |
| The work aims to explore the effect of different solution and aging heat treatment processes on the microstructure evolution in Ni30 alloy, so as to further provide reference for the formulation and optimization of heat treatment technologies. The electric upsetting samples were subject to solution treatment at 950, 1 000, 1 020, and 1 050 ℃ for 30 min, followed by water quenching, and then to aging treatment with air cooling after 4 h of holding at 720 ℃. Based on the selected solution treatment process, the aging treatment was kept at 700, 720, 740, 760 and 780 ℃ for 2, 4 and 24 h, followed by air cooling. Combined with JMatPro simulation, the microstructure evolution of Ni30 alloy was studied by scanning electron microscopy, transmission electron microscopy, and electron backscatter diffraction. With the increase of solution temperature under the same aging treatment, the large-size grains gradually engulfed the surrounding fine grains and coarsened. Meanwhile, the proportion of Σ3n (n=1, 2, and 3) grain boundaries exhibited an increasing trend and the coherent twin grain boundaries became more straight and slender. Besides, the precipitated phases were dominated by NbC, TiC, and Cr23C6, etc. Based on the same solution hot treatment regime, the increase of aging temperature could promote the increase of grain size and the precipitation of γ′ strengthened phase, which could effectively hinder the migration of dislocation. The prolongation of aging time could promote a slight increase of grain size and the precipitation of secondary carbide composite reinforced phase, such as nanoscale γ′ and Cr23C6. Finally, it can be concluded that the electric upsetting samples can obtain better microstructure when solution heated at 1 020 ℃ for 30 min with water quenching, and aged at 720 ℃ for 4 h with air cooling. |
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