金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 279-282.DOI: 10.13251/j.issn.0254-6051.2023.09.047

• 测试与分析 • 上一篇    下一篇

эи866合金锻件径向条纹形成原因与消除工艺

杨树林1, 赵吉庆2, 闫磊1, 杨钢2   

  1. 1.中国航发沈阳黎明航空发动机有限责任公司, 辽宁 沈阳 110043;
    2.钢铁研究总院有限公司 特殊钢研究院, 北京 100081
  • 收稿日期:2023-04-30 修回日期:2023-07-31 出版日期:2023-09-25 发布日期:2023-10-25
  • 通讯作者: 赵吉庆,工程师,博士,E-mail:zhaojiqing@nercast.com
  • 作者简介:杨树林(1969—),男,高级工程师,博士,主要研究方向为金属材料的组织性能,E-mail: yangsl69@sina.com。
  • 基金资助:
    国家自然科学基金(51971226)

Formation cause and elimination process of radial stripes in эи866 alloy forgings

Yang Shulin1, Zhao Jiqing2, Yan Lei1, Yang Gang2   

  1. 1. AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang Liaoning 110043, China;
    2. Research Institute for Special Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, China
  • Received:2023-04-30 Revised:2023-07-31 Online:2023-09-25 Published:2023-10-25

摘要: 通过微观组织分析,力学性能、硬度测试等方法,分析了эи866合金锻件径向条纹的形成原因,并研究了消除径向条纹的热处理工艺。结果表明,径向条纹是由带状组织引起,锻件淬火后存在大量残留奥氏体,回火冷却过程中转变为二次马氏体,与回火马氏体呈带状交替分布,导致硬度不均匀,机加工后形成径向条纹。采用二次回火,能够使二次马氏体分解回复,改善带状组织,但难以完全消除。热处理前,增加预备热处理,能够提高Ms点,淬火后发生充分的马氏体转变,大幅度降低残留奥氏体含量,形成单一均匀的回火马氏体,消除带状组织。建议锻件采用预处理+性能热处理的热处理工艺,提高组织均匀性。

关键词: эи866合金, 带状组织, 残留奥氏体, 预备热处理

Abstract: Formation reason of radial stripes in эи866 alloy forgings were analyzed by microstructure observation, mechanical properties and hardness testing. The heat treatment process to eliminate the radial stripes was also studied. The results show that the radial stripes are caused by the banded structure. A large amount of retained austenite remains after quenching, and transforms to secondary martensite in the tempering cooling process. The secondary martensite distributes alternately with the tempered martensite to form the banded structure, which results in the hardness nonuniformity and appears stripes after machining. Adding a secondary tempering after the performance heat treatment can make the martensite to decompose and recover, and the banded structure can be improved, but it is difficult to be completely eliminated. Adding preheat treatment before the performance heat treatment can raise the Ms point, make the martensite transformation sufficiently, and reduce the amount of retained austenite greatly after quenching, then a single uniform tempered martensite is formed, and the banded structure is eliminated completely. Thus, it is suggested to couple the preheat treatment with the performance heat treatment to improve the uniformity of the structure in the эи866 alloy forgings.

Key words: эи866 alloy, banded structure, retained austenite, preheat treatment

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