Effect of Vacuum Hot-Press Process on The Sintered Characteristics and Mechanical Properties of A High-Density Cr-31.2 Mass% Ti Alloy

• Autorzy: Chang S.-H. , Li C.-L. , Huang K.-T. , Yang T.-H.

Identyfikatory

DOI

10.24425/amm.2018.125097

• Języki publikacji: EN

Abstrakty

EN

In this study, two different compositions of submicron-structured titanium (760 nm) and micron-structured chromium (4.66 μm) powders were mixed to fabricate Cr-31.2 mass% Ti alloys by vacuum hot-press sintering. The research imposed various hot-press sintering pressures (20, 35 and 50 MPa), while the sintering temperature maintained at 1250°C for 1h. The experimental results showed that the optimum parameters of the hot-press sintered Cr-31.2 mass% Ti alloys were 1250°C at 50 MPa for 1h. Also, the relative density reached 99.94%, the closed porosity decreased to 0.04% and the hardness and transverse rupture strength (TRS) values increased to 81.90 HRA and 448.53 MPa, respectively. Moreover, the electrical conductivity is enhanced to 1.58 × 10⁴ S·cm^-1 However, the grain growth generated during the high-temperature and high-pressure of the hot-press sintering process resulted in the grain coarsening phenomenon of the Cr-31.2 mass% Ti alloys after 1250°C hot-press sintering at 50 MPa for 1h. In addition, the Cr-31.2 mass% Ti alloys were fabricated with the submicron-structured titanium (760 nm) and chromium (588 nm) powders showed more effective compaction than the micron-structured titanium (760 nm) and chromium (4.66 μm) powders did. The closed porosity decreases to 0.02% and the hardness values increase to 83.23 HRA. However, the agglomeration phenomenon of the Cr phase and brittleness of the TiCr₂ Laves phases easily led to a slight decrease in TRS (400.54 MPa).

Słowa kluczowe

EN

Cr-31.2 mass% Ti alloy; vacuum hot-press sintering; relative density; 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: 2018
• Tom: Vol. 63, iss. 4
• Strony: 1715--1723
• Opis fizyczny: Bibliogr. 28 poz., fot., rys., tab., wzory

Twórcy

autor

Chang S.-H.

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

autor

Li C.-L.

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

autor

Huang K.-T.

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

autor

Yang T.-H.

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

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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 w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).