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通过再结晶退火实现剪切-压缩变形态 GH4169 高温合金的显微组织均匀化
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1.江苏大学 材料科学与工程学院,江苏 镇江 212013;2.江苏银环精密钢管有限公司 技术管理部,江苏 宜兴 214200;3.重庆大学 先进装备机械传动国家重点实验室,重庆 400044;4.江苏大学 机械工程学院,江苏 镇江 212013

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基金项目:

国家自然科学基金(SKLMT-MSKFKT-202219);江苏省自然科学基金(BK20220548);新金属材料国家重点实验室开放基金资助项目(2022-Z21);高端装备机械传动全国重点实验室开放基金资助(SKLMT-MSKFKT-202219)


Microstructure Homogenization of GH4169 Superalloy in Shear-Compression Deformation State by Recrystallization Annealing
Author:
Affiliation:

1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2.Technical Management Department, Jiangsu Yinhuan Precision Steel Tube Co., Ltd, Yixing 214200, China;3.State Key Laboratory of Mechanical Transmission for Advanced Equipment, Chongqing University, Chongqing 400044, China;4.School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Fund Project:

State Key Laboratory of Mechanical Transmission for Advanced Equipment Project (SKLMT-MSKFKT-202219); Natural Science Foundation of Jiangsu Province (BK20220548); Open Research Fund from the State Key Lab of Advanced Metals and Materials, University of Science and Technology Beijing (2022-Z21); National Natural Science Foundation of China (52005223)

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    摘要:

    GH4169 高温合金在剪切-压缩变形后容易出现区域性微结构特征,这不利于后续的冷轧加工。在1000~1080 ℃温度范围内,保温1~3 h条件下进行再结晶退火处理以研究GH4169高温合金的微观组织演变行为,并通过调节晶粒大小优化其冷成形性能。结果表明,静态再结晶(SRX)在1000 ℃时完全形核,原有的粗大晶粒完全被细小的再结晶晶粒取代。大角度晶界(HAGB)的弓出位置是SRX的首选形核点。经1020~1060 ℃退火后,部分相邻的SRX晶粒之间发生吞并,导致一部分晶粒的尺寸增大,而初始动态再结晶(DRX)晶粒在应变集中区域仍保持微小的尺寸。再结晶晶粒(包括SRX和DRX)经1080 ℃退火后均匀长大,平均晶粒尺寸为87.89 μm,此时显微组织的区域特征完全消失,组织均匀化程度明显提高。由于SRX的生长事故,经1080 ℃退火后出现了阶梯状孪晶,且孪晶界 (Σ3)的长度分数达到35.8%,这有利于提高GH4169高温合金的高温持久性能。剪切-压缩变形态GH4169高温合金的最佳再结晶退火工艺最终被确定为1080 ℃保温1 h,水冷。

    Abstract:

    Regional microstructure characteristic always appears in shear-compression deformed GH4169 superalloy, which is detrimental to subsequent cold-rolling process in engineering. Recrystallization annealing treatments within temperature range of 1000?1080 °C and holding time range of 1?3 h were carried out to investigate the microstructure evolution behavior, and the cold-forming property of GH4169 superalloy was optimized by regulating the grain size. Results show that static recrystallization (SRX) grains are fully nucleated at 1000 °C and the original coarse grains are completely replaced by fine recrystallized grains. Bulges of high angle grain boundaries are the preferred nucleation points of SRX. At 1020?1060 °C, grain annexation takes place among adjacent SRX grains, causing partial grains to increase, while the original dynamic recrystallization (DRX) grains keeps tiny in the strain con-centration region. Recrystallized grains (both SRX and DRX) uniformly grow up, with an average grain size of 87.89 μm at 1080 °C, at which the regional characteristic completely disappears, and the microstructure is significantly homogenized. Step twins appear at 1080 °C due to the SRX growth accidents, and the length fraction of twin boundaries (Σ3) reaches 35.8%, which can effectively improve the high temperature resistance of GH4169 superalloy. Ultimately, the optimal recrystallization annealing of shear-compression deformed GH4169 superalloy is determined as 1080 °C-1 h, followed by water cooling.

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陈乐利,高佩,罗锐,程晓农,孟宪凯.通过再结晶退火实现剪切-压缩变形态 GH4169 高温合金的显微组织均匀化[J].稀有金属材料与工程,2024,53(7):1882~1886.[Chen Leli, Gao Pei, Luo Rui, Cheng Xiaonong, Meng Xiankai. Microstructure Homogenization of GH4169 Superalloy in Shear-Compression Deformation State by Recrystallization Annealing[J]. Rare Metal Materials and Engineering,2024,53(7):1882~1886.]
DOI:10.12442/j. issn.1002-185X. E20230040

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历史
  • 收稿日期:2023-09-28
  • 最后修改日期:2024-01-18
  • 录用日期:2024-01-31
  • 在线发布日期: 2024-07-16
  • 出版日期: 2024-07-12