金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 241-245.DOI: 10.13251/j.issn.0254-6051.2021.08.046

• 测试与分析 • 上一篇    下一篇

氧化时间对低合金弹簧钢奥氏体晶粒度测定的影响

陈继平1, 张乐1, 邢献强2, 孙国庆1, 钱健清1   

  1. 1.安徽工业大学 冶金工程学院, 安徽 马鞍山 243032;
    2.中钢集团郑州金属制品研究院有限公司, 河南 郑州 450001
  • 收稿日期:2021-03-26 出版日期:2021-08-25 发布日期:2021-12-09
  • 通讯作者: 钱健清,教授,硕士,E-mail:2376103484@qq.com
  • 作者简介:陈继平(1975—),男,副教授,博士,主要研究方向为淬火回火弹簧钢丝,E-mail:leavejames9443@163.com。
  • 基金资助:
    安徽省自然科学基金(1508085ME78)

Effect of oxidation time on evaluation of austenite grain size of low alloy spring steel

Chen Jiping1, Zhang Le1, Xing Xianqiang2, Sun Guoqing1, Qian Jianqing1   

  1. 1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
    2. Sinosteel Zhengzhou Research Institute of Steel Wire Products Co., Ltd., Zhengzhou Henan 450001, China
  • Received:2021-03-26 Online:2021-08-25 Published:2021-12-09

摘要: 氧化法可用于钢中晶粒度的测定。研究控制氧化时间对弹簧钢50CrV奥氏体晶粒度的影响。结果发现,氧化过程大致分为3个阶段:第一阶段,过剩铁素体相不断转变为奥氏体;第二阶段,基体与氧化膜之间的阴阳离子再次加快扩散,下层金属基体继续氧化脱碳,部分之前试样表面的奥氏体晶界被替代;第三阶段,一、二阶段的奥氏体晶粒逐渐长大,新旧氧化膜叠加生长,并在55SiCr、60Si2Mn、65Si2CrV钢得到验证。在不影响检测结果准确性的情况下,氧化时间可以由标准的60 min缩短至一半左右,再通过修正可得到晶粒度为10.96级,此结果与直接腐蚀法11.00级和氢致沿晶断口法11.09级相近。

关键词: 氧化法, 晶粒度, 弹簧钢, 氧化过程

Abstract: Oxidation method can be used to determine the grain size of steel. The effect of oxidation time on the evaluation of the austenite grain size of spring steel 50CrV was studied. It was found that the oxidation process can be divided into three stages. In the first stage, the excess ferrite phase is continuously transformed into austenite. In the second stage, the diffusion of anions and cations between the substrate and the oxide film is accelerated again, and the underlying metal substrate continues to oxidize and decarburize, and part of the austenite grain boundary on the surface of specimen is replaced. In the third stage, the austenite grains in the first and second stages gradually grow, and the old and new oxide films are superimposed to grow, which are verified in 55SiCr, 60Si2Mn and 65Si2CrV steels. Without affecting the accuracy of the test results, the oxidation time can be shortened from the standard 60 min to about half, and then the grain size can be obtained by modification, which is close to 11.00 grade of direct corrosion method and 11.09 grade of hydrogen induced intergranular fracture.

Key words: oxidation method, grain size, spring steel, oxidation process

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