金属热处理 ›› 2020, Vol. 45 ›› Issue (8): 12-16.DOI: 10.13251/j.issn.0254-6051.2020.08.003

• 组织与性能 • 上一篇    下一篇

E690钢奥氏体化过程的内耗分析

杜晓洁1, 何宜柱2   

  1. 1.马鞍山学院 机械工程系, 安徽 马鞍山 243100;
    2.安徽工业大学 材料科学与工程学院, 安徽 马鞍山 243000
  • 收稿日期:2020-01-20 出版日期:2020-08-25 发布日期:2020-09-07
  • 作者简介:杜晓洁(1989—),女,讲师,硕士,主要研究方向为高性能金属材料,E-mail: dxjxjq@163.com
  • 基金资助:
    安徽工业大学优秀创新团队基金(201201)

Internal friction analysis on austenitizing process of E690 steel

Du Xiaojie1, He Yizhu2   

  1. 1. Mechanical Engineering Department, Ma'anshan University, Ma'anshan Anhui 243100, China;
    2. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan Anhui 243000, China
  • Received:2020-01-20 Online:2020-08-25 Published:2020-09-07

摘要: 利用内耗法并结合硬度测试与显微组织分析,研究了奥氏体化过程加热温度与保温时间对E690钢碳化物溶解量的影响。结果表明:奥氏体化温度低于Ac3时,升高温度可以显著增加淬火钢的SKK峰值,钢中碳化物的溶解量增加;当奥氏体化温度高于Ac3时,升高温度与延长保温时间使淬火钢的SKK峰值变化不明显,钢中碳化物的溶解程度较高。另外,延长保温时间会造成淬火态试样板条状马氏体组织粗化,奥氏体化保温5 min可以使得钢中碳化物接近完全溶解,淬火态试样显微组织为板条分布较细小的状马氏体。因此,可以通过在高于Ac3点的适当温度保温较短时间进行奥氏体化来提高调质热处理的效率。

关键词: 奥氏体化温度, 保温时间, 内耗, 碳化物溶解

Abstract: Effect of austenitizing temperature and holding time on carbides dissolved amount of E690 steel was studied by means of measuring internal friction, hardness testing and microstructure analysis. The results show that, when the austenitizing temperature is lower than Ac3 point, the strength of SKK peak can be significantly increased with the increase of temperature, and the dissolved amount of carbides is also increased. When the austenitizing temperature is over the Ac3 point, the strength of SKK peak does not change obviously with the increase of temperature and holding time, the degree of carbide dissolution in the steel is relatively high. Besides, the structure of coarsened martensite can be observed by the process of an extended holding time. The carbides in the steel can completely be dissolved during austenitizing for 5 min, in which the microstructure is a martensite with a relatively small distribution of strips. Therefore, it is feasible that the efficient of quenching and tempering is improved through selecting shorter holding time when the temperature is appropriately over Ac3 point.

Key words: austenitizing temperature, holding time, internal friction, carbide dissolving

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