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| GH4169合金锻造混晶组织的均匀细化机制与工艺 |
| Uniformly Refining Mechanism and Technology of Mixed-grain for Forged GH4169 Superalloy |
| Received:August 30, 2020 |
| DOI：10.3969/j.issn.1674-6457.2021.01.010 |
| 中文关键词: GH4169合金 锻造成形 混晶组织 δ相 双级热处理 |
| 英文关键词: GH4169 alloy forging mixed grain microstructure δ phase two-stage heat treatment |
| 基金项目:国家自然科学基金(51975593，51775564) |
| Author Name | Affiliation | | WANG Guan-qiang | College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China | | CHEN Ming-song | College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Light Alloy Research Institute, Central South University, Changsha 410083, China | | LIN Yong-cheng | College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Light Alloy Research Institute, Central South University, Changsha 410083, China | | MA Yan-yong | College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China |
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| 中文摘要: |
| 目的 消除GH4169合金锻造混晶组织，获得高品质GH4169合金锻件的制备工艺。方法 对变形后锻件进行后续的热处理退火，探明均匀细化锻造混晶组织的热处理工艺方法与机制。首先，设计并实施不同的单级退火工艺及双级退火工艺。随后，统计不同热处理退火工艺下锻造混晶组织的平均晶粒尺寸。最后，分析不同热处理退火工艺下混晶组织的细化机制与不足。在此基础上，获得能均匀细化锻造混晶组织的热处理工艺方法。结果 采用低温时效处理和后续的高温再结晶退火处理结合的双级热处理退火工艺，可以有效地将锻造混晶组织均匀细化至ASTM 10级以上。结论 变形后进行热处理可以通过再结晶行为显著改善锻造混晶组织的均匀性与细化程度。高温再结晶退火热处理前预先析出足够数量的δ相，有利于更好地均匀细化变形混晶组织。 |
| 英文摘要: |
| The work aims to explore the method for eliminating the deformed mixed grainmicrostructure of GH4169 superalloy, and obtain the preparation process of high-quality GH4169 superalloy forging. The annealing treatment was used for the deformed sample, and the method and mechanism for uniformly refiningdeformed mixed grain were investigated. Firstly, different single-stage annealing treatments and two-stage annealing treatments were designed and implemented. Afterwards, the average grain size of the final annealed grains obtained by different annealing treatments were counted and compared. Finally, the refinement mechanism of deformed mixed grain and shortcomings of different annealing treatments were analyzed. On this basis, the annealing treatment method that can uniformly refine the deformed mixed grain was obtained. It is found that the two-stage heat treatment process combined with low temperature aging treatment and subsequent high temperature recrystallization annealing treatment can effectively refine the deformed mixed grain to more than ASTM 10 levels. The results show that the annealing treatment can significantly improve the uniformity and refinement of the deformed mixed grainby recrystallization. Moreover, enough δ phases separated out before high temperature recrystallization annealing treatment is beneficial to uniformly refine deformed mixed grain. |
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