东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (1): 149-152.DOI: 10.12068/j.issn.1005-3026.2014.01.034

• 物理 • 上一篇    

烘烤硬化钢的音频内耗研究

于宁1，刘永刚2，詹华2，戢景文1   

  1. (1.东北大学 理学院， 辽宁 沈阳110819； 2.马鞍山钢铁公司 技术中心， 安徽 马鞍山243000)
  • 收稿日期:2012-11-05 修回日期:2012-11-05 出版日期:2014-01-15 发布日期:2013-07-09
  • 通讯作者: 于宁
  • 作者简介:于宁(1965-)，女，辽宁本溪人，东北大学副教授；戢景文(1938-)，男，湖南长沙人，东北大学教授.
  • 基金资助:
    国家自然科学基金资助项目(51171044)；中央高校基本科研业务费专项资金资助项目(N110205001)；马鞍山钢铁公司合作项目.

Study of AudioFrequency Internal Friction in BakeHardening Steel

YU Ning1， LIU Yonggang2， ZHAN Hua2， JI Jingwen1   

  1. 1. School of Sciences， Northeastern University， Shenyang 110819， China; 2. Technological Center， Ma’anshan Iron & Steel Co.， Ltd.， Ma’anshan 243000， China.
  • Received:2012-11-05 Revised:2012-11-05 Online:2014-01-15 Published:2013-07-09
  • Contact: JI Jingwen
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摘要： 用音频内耗仪，在加与不加磁场(磁场强度为300Oe)的不同条件下，测量了H180钢热轧及烘烤不同时间试样的290~630K内耗.在Q-1-T谱中出现了两个较明显的内耗峰，一个在362K附近，另一个在474K附近(测量频率2300~2150Hz)；随着时效时间的增加，第一个峰不断减小，第二个峰不断增大.分析得出，第一个峰为Snoek峰，第二个峰为B峰.对比加与未加磁场测量的内耗看出，加磁场后的“背景”内耗反而比未加磁场时的“背景”内耗要高，而且音频测量引起的这种加磁场“背景”内耗比未加磁场时增强，却随温度升高下降.

关键词: 汽车钢, 烘烤硬化性, 音频, 内耗, 稀Cottrell气团

Abstract: The internal frictions from 290 to 630K in the H180 steel specimens hotrolled or baked for various time were measured under different conditions with and without a magnetic field (magnetic field strength is 300Oe) using an audiofrequency internal friction instrument. It is found that there are two clear peaks of internal friction in all the Q-1T curves， and that the first peak appears at about 362K， while the other one occurs at about 474K (measurement frequencies are 2300~2150Hz). With increasing baking time， the first peak continuously decreases but the second peak increases. Analysis demonstrates that the first peak is the Snoek peak and the second one is the B peak. A comparison of the internal frictions measured with and without a magnetic field shows that the background internal friction measured under a magnetic field is higher than that measured without a magnetic field. Such a background internal friction is enhanced under the present audiofrequency measurements， but it decreases with increasing the measurement temperature.

Key words: automobile steel, bake hardening property, audiofrequency, internal friction, thin Cottrell atmosphere

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