金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 92-96.DOI: 10.13251/j.issn.0254-6051.2020.12.017

• 工艺研究 • 上一篇    下一篇

齿轮用TL-4521钢的锻后余热等温正火

王会珍, 翟月雯, 周乐育   

  1. 北京机电研究所有限公司, 北京 100083
  • 收稿日期:2020-07-13 出版日期:2020-12-25 发布日期:2021-01-14
  • 作者简介:王会珍(1984—),女,高级工程师,博士,主要研究方向为材料热处理,E-mail:wanghzh@jds.ac.cn
  • 基金资助:
    “高档数控机床与基础制造装备”国家科技重大专项子课题(2018ZX04024001-002)

Isothermal normalizing of TL-4521 steel for gear by residual heat after forging

Wang Huizhen, Zhai Yuewen, Zhou Leyu   

  1. Beijing Research Institute of Mechanical and Electrical Technology Ltd., Beijing 100083, China
  • Received:2020-07-13 Online:2020-12-25 Published:2021-01-14

摘要: 以TL-4521钢为研究对象,在Gleeble-3800热模拟试验机上对其进行模拟锻后余热等温正火处理,分析温锻后冷却速度、等温保温时间、变形量对其组织及硬度的影响。结果表明:随温锻后冷却速度增加,铁素体含量减少,组织显著细化,硬度升高;等温保温时间越长,珠光体转变越充分,且组织趋于均匀化,硬度降低。温锻变形量增大,奥氏体内形成更多变形带组织,在后续冷却时铁素体形核数量增多,晶粒得到细化,形变强化显著,硬度升高。

关键词: TL-4521钢, 切削加工, 等温正火, 显微组织, 硬度

Abstract: Taken TL-4521 steel as the research object, the isothermal normalizing process utilizing residual heat after simulated forging was carried out on Gleeble-3800 thermal simulation testing machine, and the effects of cooling rate, isothermal holding time and deformation on microstructure and hardness were analyzed. The results show that with the increase of cooling rate after warm forging, the ferrite content decreases, the microstructure is refined significantly, and the hardness increases; the longer the holding time, the more sufficient pearlite is, and the microstructure tends to be homogenized, and the hardness decreases. The larger the warm forging deformation, the more deformation bands are formed in austenite. During the subsequent cooling, the number of ferrite nucleation increases, the grains are refined, the deformation strengthening is significant, and the hardness increases.

Key words: TL-4521 steel, cutting, isothermal normalizing, microstructure, hardness

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