Magnetic and Microstructural Characterization of Carburized 25Cr35NiNb Alloy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-18 DOI:10.1109/LMAG.2024.3376152

Shukai Chen;Minghao Zhang;Ke Huang;Genghao Jiao;Yihua Kang;Bo Feng

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Abstract

During the service of an HP tube, carbon diffuses into the tube wall, forming a carburization layer and reducing the mechanical strength. To quantitatively measure the carburization layer thickness, its magnetic properties should be accurately characterized. Magnetic properties, including saturation magnetization and magnetic permeability, of chromium-depleted HP alloy have been characterized by a vibration sample magnetometer and the eddy current method. The microstructural observations were made using optical microscopy and scanning electron microscopy. The change of the magnetic properties with chromium content has been quantitatively obtained. The results show that the saturated mass magnetization and magnetic permeability have abrupt increases when chromium content is less than 14.6% and 11.8%, respectively. The obtained properties were further used to quantitatively evaluate the carburization layer thickness in a slice of ex-serviced tube. The estimation error was less than 0.33 mm, indicating the characterized magnetic properties are effective for the carburization layer measurement.

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渗碳 HP 合金的磁性和微观结构表征

HP 管在使用过程中，碳会扩散到管壁，形成渗碳层，降低机械强度。要定量测量渗碳层厚度，就必须准确表征其磁性能。我们采用振动样品磁力计和涡流法对贫铬 HP 合金的磁性能（包括饱和磁化和磁导率）进行了表征。使用光学显微镜和扫描电子显微镜对微观结构进行了观察。定量分析了磁性能随铬含量的变化。结果表明，当铬含量低于 14.6% 和 11.8% 时，饱和磁化率和磁导率会突然增加。获得的特性被进一步用于定量评估退役钢管切片的渗碳层厚度。估算误差小于 0.33 毫米，表明所表征的磁性能对渗碳层测量有效。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.