Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures

• Autorzy: Chang Shih-Hsien , Chang Chih-Yao , Huang Kuo-Tsung

Identyfikatory

DOI

10.24425/amm.2020.131742

• Języki publikacji: EN

Abstrakty

EN

In this research, Co-30 mass% Cr alloys were fabricated by a vacuum hot-press sintering process. Different amounts of submicron cobalt and chromium (the mean grain size is 800 and 700 nm, respectively) powders were mixed by ball milling. Furthermore, this study imposed various hot-press sintering temperatures (1100, 1150, 1200 and 1250°C) and pressures (20, 35 and 50 MPa), while maintaining the sintering time at 1 h, respectively. The experimental results show that the optimum parameters of hot-press sintered Co-30 mass% Cr alloys are 1150°C at 35 MPa for 1 h. Mean while, the sintered density reaches 7.92 g·cm^-3, the closed porosity decreases to 0.46%, and the hardness and transverse rupture strength (TRS) values increase to 77.2 HRA and 997.1 MPa, respectively. While the hot-press sintered Co-30 mass% Cr alloys at 1150°C and 20 MPa for 1 h, the electrical conductivity was slightly enhanced to 1.79 × 10⁴ S·cm^-1, and the phase transformation (FCC → HCP) of cobalt displayed a slight effect on sintering behaviors of Co-30 mass% Cr alloys. All these results confirm that the mechanical and electrical properties of Co-30 mass% Cr alloys are effectively improved by using the hot-press sintering technique.

Słowa kluczowe

EN

Co-30 mass% Cr alloys; hot-press sintering; hardness; TRS; electrical conductivity

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2020
• Tom: Vol. 65, iss. 1
• Strony: 393--402
• Opis fizyczny: Bibliogr. 23 poz., fot., rys., tab., wzory

Twórcy

autor

Chang Shih-Hsien

• National Taipei University of Technology, Department of Materials and Mineral Resources Engineering, Taipei 10608, Taiwan, ROC

autor

Chang Chih-Yao

• National Taipei University of Technology, Department of Materials and Mineral Resources Engineering, Taipei 10608, Taiwan, ROC

autor

Huang Kuo-Tsung

• National Kangshan Agricultural Industrial Senior High School, Department of Auto-Mechanics, Kaohsiung 82049, Taiwan, ROC

Bibliografia

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Uwagi

EN

1. This research is supported by the ASSAB STEELS TAIWAN CO., LTD. The authors would like to express their appreciation for Dr. Harvard Chen, Michael Liao and Mr. Meng-Yu Liu.

PL

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).