Monitoring Microstructure and Properties Changes in 35CrMo Steel Components Using Magnetic Hysteresis Loop and X-Ray Diffraction Techniques

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Experimental Techniques Pub Date : 2024-10-23 DOI:10.1007/s40799-024-00760-7

H. Chen, B. Xu, Z.-X. Shen, Y.-P. Niu, J. Zhou, J.-D. Zhu, G.-M. Cao, Q. Wang

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引用次数: 0

Abstract

For the structural health monitoring of in-service structural components, an important topic is to accurately assess the changes in their microstructure and performance through effective methods. Conventionally, magnetic non-destructive testing technology is very sensitive to changes in microstructure, making it highly suitable for online monitoring of product quality. Based on hysteresis loop and X-ray diffraction techniques, the relationships between microstructure, residual stress and magnetic properties of the full-scale 35CrMo steel components during the heat treatment were studied. Compared to the original state, the quenching and tempering heat treatment processes resulted in significant variations in the magnetic coercive force and the surface residual stresses, which were effectively characterized by the X-ray diffraction cosα method with the Debye–Scherer ring. It was found that the increment in the coercive field has occurred due to the domain wall pinning caused by grain refinement, precipitated carbides and compressive residual stress, while the hardness was increased mainly by precipitation hardening. In particular, the coercivity exhibited a good fit with the hardness and strength, and the correlation coefficients were 0.96 and 0.98, respectively. The current state of the arts allows to forecast the possibility to apply magnetic coercivity measurements for monitoring the microstructure and properties of steel products. However, in order to ensure the reliability of the measurement, it is recommended to establish a standardized procedure for magnetic measurement to reduce the influence of external interference.

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利用磁滞回线和x射线衍射技术监测35CrMo钢构件的组织和性能变化

在役构件结构健康监测中，通过有效的方法准确评估构件的微观结构和性能变化是一个重要课题。传统的磁性无损检测技术对微观结构的变化非常敏感，非常适合于产品质量的在线监测。基于磁滞回线和x射线衍射技术，研究了35CrMo足尺钢构件在热处理过程中的组织、残余应力和磁性能之间的关系。与原始状态相比，淬火和回火热处理过程导致磁矫顽力和表面残余应力发生了显著变化，并用Debye-Scherer环的x射线衍射cosα法对其进行了有效表征。结果表明，合金矫顽力场的增加主要是由于晶粒细化、析出碳化物和残余压应力引起的畴壁钉钉作用，而硬度的提高主要是由于析出硬化作用。其中矫顽力与硬度和强度的相关系数分别为0.96和0.98。目前的技术水平允许预测应用矫顽力测量来监测钢产品的微观结构和性能的可能性。但是，为了保证测量的可靠性，建议建立标准化的磁测量程序，以减少外界干扰的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.