北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (11): 2312-2320.doi: 10.13700/j.bh.1001-5965.2018.0086

• 论文 • 上一篇    下一篇

热处理及测量方式对纵波声速评价材料硬度的影响

门平1,2, 董世运1, 闫世兴1, 康学良1, 李恩重1   

  1. 1. 陆军装甲兵学院 装备再制造技术国防科技重点实验室, 北京 100072;
    2. 中国人民解放军海军92601部队, 湛江 524009
  • 收稿日期:2018-02-08 修回日期:2018-05-25 出版日期:2018-11-20 发布日期:2018-11-27
  • 通讯作者: 董世运,E-mail:syd422@sohu.com E-mail:syd422@sohu.com
  • 作者简介:门平,男,博士研究生。主要研究方向:超声检测技术、材料力学性能无损检测与评价;董世运,男,博士,研究员,博士生导师。主要研究方向:表面工程、激光制造与再制造及其质量无损检测评价。
  • 基金资助:
    国家重点研发计划(2016YFB1100205,2017YFF0207905);国家自然科学基金(51705532);北京市科技专项(Z161100004916009);北京市科技计划(Z161100001516007)

Influence of heat treatment and measurement methods on material hardness evaluation by longitudinal wave velocity

MEN Ping1,2, DONG Shiyun1, YAN Shixing1, KANG Xueliang1, LI Enzhong1   

  1. 1. National Key Laboratory for Remanufacturing, Academy of Army Armored Forces, Beijing 10007;
    2. 92601 Troops, People's Liberation Army Navy, Zhanjiang 524009, China
  • Received:2018-02-08 Revised:2018-05-25 Online:2018-11-20 Published:2018-11-27
  • Supported by:
    National Key R&D Program of China (2016YFB1100205, 2017YFF0207905); National Natural Science Foundation of China (51705532); the Beijing Major Science and Technology Projects (Z161100004916009); the Beijing Municipal Science and Technology Projects (Z161100001516007)

摘要: 硬度是材料力学性能的重要指标之一,目前采用超声无损检测方法评价材料的硬度指标存在诸多挑战。通过搭建高精度声时测量系统,采用超声纵波脉冲反射回波法测量不同热处理45钢试件沿厚度方向的超声波传播声时,计算超声纵波声速。同时改变门信号的测量方式,研究不同热处理及门信号测量方式对超声纵波声速评价材料硬度的影响。建立材料硬度、微观组织以及超声纵波声速之间的映射关系,得到超声纵波声速评价45钢试件硬度指标的标定模型,并对标定模型进行验证。标定模型预测硬度误差满足工程应用误差10%的要求。

关键词: 纵波声速, 硬度, 微观组织, 测量信号, 映射关系

Abstract: Hardness is one of the important indexes of mechanical performance of materials, and employing ultrasonic nondestructive testing method for hardness evaluation faces many challenges now. In this paper, through setting up high-precision ultrasonic wave transmission time measurement system, the longitudinal wave propagation time in the thickness direction of different heat treated 45 steel specimens was measured by pulse reflected echo method, and the longitudinal wave velocity was calculated. Simultaneously, the gate signal measurement methods were changed, and the effects of different heat treatment and gate signal measurement methods on hardness evaluation by the longitudinal wave velocity were studied.On this basis, the mapping relationship among material hardness, microstructure and longitudinal wave velocity was obtained, and the calibration model for evaluating the hardness of 45 steel specimens by longitudinal wave velocity was established and verified. The hardness prediction error by the calibration model meets the error requirement of 10% for engineering application.

Key words: longitudinal wave velocity, hardness, microstructure, measurement signal, mapping relationship

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