HRPD and TEM Study of P/M 58Fe17Cr25Ni Austenitic Stainless Steel Synthesized by Spark Plasma Sintering

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-12-13 DOI:10.36547/ams.28.4.1548

S. Mustofa, M. Dani, P. Parikin, T. Sudiro, B. Hermanto, D. R. Adhika, A. Insani, S. Syahbuddin, T. Hino, C. A. Huang

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Abstract

58Fe17Cr25Ni austenite stainless steel has been fabricated using metal powder through sintering with a spark plasma at temperatures of 900 and 950°C for 5 minutes. High purity Fe, Ni and Cr powders were used as materials for this steel. Before sintering, the powder was mixed in a milling equipment which was processed for 5 hours, then it is formed into a coin by pressing it under a load of 25 tons. High resolution powder neutron diffractometer was used for identifying the crystal structure in the 58Fe17Cr25Ni austenitic stainless steel. The sintering process at temperatures of 900C and 950°C generally forms microstructure having matrix of equiaxed austenite grains, with a crystal structure of face-centered cubic which included in the Fm3m space group. Some particles with high Cr content, a'-Cr, are distributed in all austenite grains. The austenite grains seen in the 58Fe17Cr25Niaustenitic stainless steel sintered at 900°C are twin grains. Dislocations, slip planes and bands are also existed in those grains. These defects are expected to decrease with increasing sintering temperatures up to 950° C. This change was followed by the appearance of air bubbles and sub-grains as the dominant sub-structures in the 58Fe17Cr25Ni austenitic stainless steel sintered at 950°C.

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放电等离子烧结法制备P/M58Fe17Cr25Ni奥氏体不锈钢的HRPD和TEM研究

用金属粉末在900℃和950℃的火花等离子体烧结5分钟制备了58Fe17Cr25Ni奥氏体不锈钢。采用高纯铁、镍、铬粉末作为该钢的原料。在烧结之前，将粉末混合在磨粉设备中，经过5小时的加工，然后在25吨的载荷下压成硬币。采用高分辨粉末中子衍射仪对58Fe17Cr25Ni奥氏体不锈钢的晶体结构进行了鉴定。在900℃和950℃的烧结过程中，一般形成以等轴奥氏体晶粒为基体的显微组织，具有面心立方的晶体结构，属于Fm3m空间群。在所有奥氏体晶粒中均分布有高Cr含量的a′-Cr颗粒。900℃烧结的58fe17cr25ni奥氏体不锈钢的奥氏体晶粒为双晶。晶粒中还存在位错、滑移面和滑移带。当烧结温度达到950℃时，这些缺陷随着烧结温度的升高而减少，在950℃烧结时，58Fe17Cr25Ni奥氏体不锈钢的主要亚组织是气泡和亚晶粒的出现。

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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.