金属热处理 ›› 2025, Vol. 50 ›› Issue (2): 74-80.DOI: 10.13251/j.issn.0254-6051.2025.02.011

• 组织与性能 • 上一篇    下一篇

一种无碳化物贝氏体钢的CCT与TTT曲线

杨斯媛1, 李爱国2, 罗平1, 张文良1, 李贤君1, 张明皓1,3, 安伟骋1, 王恺择1   

  1. 1.中国机械总院集团北京机电研究所有限公司, 北京 100083;
    2.中国机械科学研究总院集团有限公司, 北京 100089;
    3.北京科技大学 机械工程学院, 北京 100083
  • 收稿日期:2024-06-13 修回日期:2024-12-11 发布日期:2025-04-10
  • 通讯作者: 李爱国,正高级工程师,E-mail:liag@jds.ac.cn
  • 作者简介:杨斯媛(1999—),女,硕士研究生,主要研究方向为先进热处理工艺,E-mail:m17822012378@163.com。

CCT and TTT curves of a carbide-free bainitic steel

Yang Siyuan1, Li Aiguo2, Luo Ping1, Zhang Wenliang1, Li Xianjun1, Zhang Minghao1,3, An Weicheng1, Wang Kaize1   

  1. 1. China Academy of Machinery Beijing Research Institute of Mechanical & Electrical Technology Co., Ltd., Beijing 100083, China;
    2. China Academy of Machinery Science and Technology Group Co., Ltd., Beijing 100089, China;
    3. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2024-06-13 Revised:2024-12-11 Published:2025-04-10

摘要: 利用DIL-805A相变仪对无碳化物贝氏体钢开展过冷奥氏体连续冷却转变和等温转变试验,获得了试验钢的CCT曲线和TTT曲线。结果表明,试验钢的奥氏体开始转变温度和终止转变温度分别760 ℃和860 ℃,马氏体开始转变温度约为300 ℃。当冷却速度在0.1~15 ℃/s之间,过冷奥氏体主要转变为贝氏体+马氏体复相组织;冷却速度在15~50 ℃/s之间,过冷奥氏体全部转变为马氏体组织;随着冷却速度增加,试验钢硬度增加,最高可达740 HV0.5。当试验钢进行等温转变时,其贝氏体转变温度范围为300~400 ℃,“鼻尖”温度约为360 ℃。

关键词: 无碳化物贝氏体钢, CCT曲线, TTT曲线

Abstract: Continuous cooling transformation and isothermal transformation tests of undercooled austenite were carried out on a carbide-free bainitic tested steel by using the DIL-805A phase transformation tester. The CCT and TTT curves of the tested steel were obtained. The results show that the starting and ending transformation temperatures of austenite of the tested steel are 760 ℃ and 860 ℃, respectively, and the starting transformation temperature of martensite is approximately 300 ℃. When the cooling rate is between 0.1-15 ℃/s, the undercooled austenite mainly transforms to bainite+martensite complex structure. When the cooling rate is between 15-50 ℃/s, the undercooled austenite transforms into martensite. The microhardness of the tested steel increases with the increase of cooling rate, up to 742 HV0.5. When the tested steel undergoes isothermal transformation, the bainite transformation temperature range is 300-400 ℃, and the "nose tip" temperature is about 360 ℃.

Key words: carbide-free bainitic steel, CCT curve, TTT curve

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