Characteristic analysis of high-speed steel powder prepared by gas atomisation

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-04-24 DOI:10.1177/00325899241248995

Deyin Zhang, Tianyu Lu, Xu Hao, Jiyang Tian, Ying Yu, Baorui Jia, Haoyang Wu, Mingli Qin, Xuanhui Qu

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Abstract

The performance of high-speed steel (HSS) powder is a prerequisite for the preparation of high-performance powder metallurgy HSS. The physical properties, microstructure, and solidification characteristics of HSS powder prepared by nitrogen gas atomisation were systematically studied and analysed in detail. For the atomised TPM558 HSS powder, the morphology is spherical and the particle size distribution is wide. The smooth small particles of satellite powder attach to the surface of large particles. Shrinkage pits caused by solidification shrinkage exist on the surface of large particles. The average cooling rate is between 104 and 106 K·s−1, with the increase of cooling rate, the powder surface tends to be smooth, and the grain structure is transformed in the order of cellular to dendritic to radial. The single powder particle surface shows fine-equiaxed grains, while the internal presents columnar grains. The crystalline phases of the powder are austenite, ferrite, martensite, and carbide, and the carbide includes MC carbide with face-centred structure and M2C carbide with hexagonal structure. The average nano-hardness of the powder is 9.93 GPa, resulting in poor formability, and it can be pressed and formed only after adding binder.

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气体雾化制备高速钢粉末的特性分析

高速钢（HSS）粉末的性能是制备高性能粉末冶金高速钢的先决条件。本文对氮气雾化制备的高速钢粉末的物理性能、微观结构和凝固特性进行了系统研究和详细分析。对于雾化的 TPM558 高速钢粉末，其形貌为球形，粒度分布较宽。卫星粉末的光滑小颗粒附着在大颗粒表面。大颗粒表面存在凝固收缩造成的收缩坑。平均冷却速率在 104 至 106 K-s-1 之间，随着冷却速率的增加，粉末表面趋于光滑，晶粒结构按蜂窝状到树枝状再到放射状的顺序转变。单个粉末颗粒表面呈现细等轴晶粒，内部则呈现柱状晶粒。粉末的结晶相为奥氏体、铁素体、马氏体和碳化物，碳化物包括面心结构的 MC 碳化物和六方结构的 M2C 碳化物。粉末的平均纳米硬度为 9.93 GPa，因此成型性较差，只有在添加粘结剂后才能压制成型。

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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.