Contributions of carbon content and cooling rate on phase transformations and mechanical properties of sintered Fe-1.5Cr-0.2Mo-xC alloys

Mantana  YARUAN; Wantana  KOETNIYOM; Thanyaporn YOTKAEW; Nattaya TOSANGTHUM; Ruangdaj TONGSRI

doi:10.55713/jmmm.v36i1.2346

Authors

Mantana YARUAN Department of Industrial Physics and Medical Instrumentation (IMI), Faculty of Applied Science, King Mongkut University of Technology North Bangkok, Bangkok 10800, Thailand.
Wantana KOETNIYOM Department of Industrial Physics and Medical Instrumentation (IMI), Faculty of Applied Science, King Mongkut University of Technology North Bangkok, Bangkok 10800, Thailand; Lasers and Optics Research Center (LANDOS), King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand https://orcid.org/0000-0002-8785-4054
Thanyaporn YOTKAEW Particulate Materials Processing Technology Laboratory (PMPT), Metal and Manufacturing Process Research Group (MMP), National Metal and Materials Technology Center,114 Phaholyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand.
Nattaya TOSANGTHUM Particulate Materials Processing Technology Laboratory (PMPT), Metal and Manufacturing Process Research Group (MMP), National Metal and Materials Technology Center,114 Phaholyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand.
Ruangdaj TONGSRI Particulate Materials Processing Technology Laboratory (PMPT), Metal and Manufacturing Process Research Group (MMP), National Metal and Materials Technology Center,114 Phaholyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand.

DOI:

https://doi.org/10.55713/jmmm.v36i1.2346

Keywords:

Sintering, Ferrite carbide mixture, martensite-austenite constituent, Mechanical property

Abstract

Microstructural development in sintered Fe-1.5Cr-0.2Mo-xC alloys, produced under different cooling rates of 0.1℃∙s^‒1and 5.4℃∙s^‒1, was investigated. It was found that, in slowly sintered Fe-1.5Cr-0.2Mo-xC alloys, the microstructure changed from hypoeutectoid to eutectoid and to hypereutectoid steel microstructural features with increasing carbon content. Under the fast-cooling rate of 5.4℃∙s^‒1, the microstructural change with respect to the increase of carbon content involved the competition between the formation of ferrite + carbide mixture and that of martensite-austenite constituent. The increase of tensile strength of slowly cooled sintered Fe-1.5Cr-0.2Mo-xC alloys with increasing carbon content was attributed to the increase of pearlite fraction, while the increase of tensile strength of fast-cooled sintered Fe-1.5Cr-0.2Mo-xC alloys was attributed to ferrite morphology change, the formation of ferrite + carbide mixture, and the formation of martensite-austenite constituent.

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