Analysis of the Microstructure and Hardness of Flake Graphite Cast Iron Using the Barkhausen Noise Method and Conventional Techniques

IF 2.6 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Journal of Nondestructive Evaluation Pub Date : 2024-04-27 DOI:10.1007/s10921-024-01065-w

Katarzyna Makowska, Zbigniew L. Kowalewski

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Abstract

The new brake disc was evaluated for microstructure and hardness by the conventional destructive tests and non-destructive Barkhausen noise method (BNM). Ten non-destructive measurements were carried out in different areas of a brake disc, which were then cut out and made into metallographic test samples. Qualitative and quantitative analysis of graphite precipitates was performed to assess their volume in material matrix, anisotropy and size. Subsequently, graphs showing the relationships between selected stereological parameters of graphite precipitates and parameters determined from the RMS envelope of Barkhausen noise were elucidated. Similar relationships between hardness and parameters coming from non-destructive tests were carried out. Magnetic parameters that specified the size of a graphite precipitate was selected. In addition, repeatability studies using BNM were carried out in the areas of the material with the smallest and largest average size of graphite precipitates. A linear relationship between amplitude of BN and length of graphite flakes was found. The paper presents the possibilities of assessing the volume and size of graphite precipitates, as well as cast iron hardness using BNM.

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使用巴克豪森噪声法和传统技术分析片状石墨铸铁的微观结构和硬度

通过传统的破坏性测试和非破坏性的巴克豪森噪声法（BNM），对新型制动盘的微观结构和硬度进行了评估。对制动盘的不同区域进行了十次非破坏性测量，然后将其切割成金相测试样品。对石墨析出物进行了定性和定量分析，以评估其在材料基体中的体积、各向异性和大小。随后，绘制了石墨析出物的选定立体参数与根据巴克豪森噪声有效值包络确定的参数之间的关系图。硬度与非破坏性测试参数之间也存在类似的关系。选择了指定石墨析出物尺寸的磁性参数。此外，还在石墨析出物平均尺寸最小和最大的材料区域使用 BNM 进行了重复性研究。结果发现，BN 的振幅与石墨薄片的长度呈线性关系。本文介绍了使用 BNM 评估石墨析出物的体积和尺寸以及铸铁硬度的可能性。

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

Journal of Nondestructive Evaluation 工程技术-材料科学：表征与测试

CiteScore

4.90

自引率

7.10%

发文量

审稿时长

9 months

期刊介绍： Journal of Nondestructive Evaluation provides a forum for the broad range of scientific and engineering activities involved in developing a quantitative nondestructive evaluation (NDE) capability. This interdisciplinary journal publishes papers on the development of new equipment, analyses, and approaches to nondestructive measurements.