Characterization of 17-4PH stainless steel powders produced by supersonic gas atomization

• Published in: International journal of minerals, metallurgy and materials Vol. 19; no. 1; pp. 83 - 88
• Main Authors: Zhao, Xin-ming, Xu, Jun, Zhu, Xue-xin, Zhang, Shao-ming, Zhao, Wen-dong, Yuan, Guo-liang
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 2012; Springer Nature B.V; National Engineering and Technological Research Center for Non-ferrous Metals Composites, General Research Institute for Non-ferrous Metals, Beijing 100088, China%National Engineering and Technological Research Center for Non-ferrous Metals Composites, General Research Institute for Non-ferrous Metals, Beijing 100088, China; Beijing COMPO Advanced Technology Co. Ltd., Beijing 100088, China
• Subjects: 17-4PH不锈钢; Atomizing; Cellular; Cellular structure; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Cooling rate; Corrosion and Coatings; Dendrites; Dendritic structure; Diameters; Diffraction; Gas atomization; Glass; Lasers; Martensitic stainless steels; Materials Science; Metal powders; Metallic Materials; Natural Materials; Particle size; Precipitation hardening steels; Scanning electron microscopy; Stainless steels; Supersonic nozzles; Surfaces and Interfaces; Thin Films; Tribology; X-ray diffraction; 不锈钢粉末; 扫描电子显微镜; 激光粒度分析仪; 表征; 表面微结构; 超音速喷嘴; 超音速气体雾化; gas atomization; stainless steel; metal injection molding; metal powder
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-012-0519-0

17-4PH stainless steel powders were prepared using a supersonic nozzle in a close-coupled gas atomization system. The characteristics of powder particles were carried out by means of a laser particle size analyzer, scanning electron microscopy （SEM）, and the X-ray diffraction （XRD） technique. The results show that the mass median particle diameter is about 19.15 prn. Three main types of surface microstructures are observed in the powders： well-developed dendrite, cellular, and cellular dendrite structure. The XRD measurements show that, as the particle size decreases, the amount of fcc phase gradually decreases and that of bcc phase increases. The cooling rate is inversely related to the particle size, i.e., it decreases with an increase in particle size.