Phase transformation and precipitation hardening behavior of Cr and Fe in BS40CrFeSn alloy
Phase transformation and precipitation hardening behavior of the water atomized copper alloy powder was studied by aging treatment, to develop high strength Cu–40Zn–X (X: Cr, Fe, Sn) alloys by powder metallurgy process. Super-saturated solid solution elements of Cr and Fe are formed in the brass matrix, and single β phase was retained in the raw powder after water atomization. Solid solubility of Cr and Fe decreased with increase of aging temperature, and phase transformation evolved from single β phase to α + β duplex phase structure after aged at the elevated temperature of 773 K and over. It was clarified that Cr showed higher precipitation potential than Fe in the brass matrix. The hardness depended strongly upon solid solubility of Cr and Fe, and upon phase transformation.
KeywordsSolid Solubility Aging Temperature Green Compact Fine Dispersoid Water Atomize Powder
This work was financially supported by Regional Research and Development Resources Utilization Program, Japan Science and Technology Agency (JST). The authors extend their thanks to Nihon atomized metal powders corporation (Project Manager: Mr. Koji Yamamoto, Mr. Motoi Takahashi, and Mr. Eisuke Yotsuka), for providing powders used in this study. And also grateful to San-Etsu metals Co. LTD. (Project Manager: Mr. Yoshiharu Kosaka and Mr. Akimichi Kojima), for their technical supports in this study. The authors sincerely thank the researchers of the Joining and Welding Research Institute (JWRI) in Osaka University, Mr. Yoshinori Muraki, Ms. Sachiyo Nakamura, and Mr. Kyugo Inui for assistant carrying out extrusion experiment.
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