Effects of graphite additive contents and processing parameters on the mechanical properties of sintered and case-hardened compacts made of molybdenum hybrid-alloyed steel powder

Shigeru Unami, Yukiko Ozaki

Research output: Contribution to journalArticle

Abstract

Effects of graphite additive contents and processing parameters on the mechanical properties of sintered and case-hardened compacts made of molybdenum hybrid-alloyed steel powder have been investigated. High tensile strength and impact value were obtained in the conditions of the medium internal carbon content, higher sintering temperature, lower carbon potential or shorter carburizing time. The mechanical properties are deteriorated due to increasing hard martensite phases with high carbon content. It is believed that the reduction of these mechanical properties are mainly caused by increasing of brittle fracture by an internal notch effect of the pores, because the hard martensite phase have a high notch sensitivity.

Original languageEnglish
Pages (from-to)579-584
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume63
Issue number7
DOIs
Publication statusPublished - Jan 1 2016

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Molybdenum
Graphite
Steel
Powders
Carbon
Martensite
Mechanical properties
Processing
Carburizing
Brittle fracture
Tensile strength
Sintering
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "Effects of graphite additive contents and processing parameters on the mechanical properties of sintered and case-hardened compacts made of molybdenum hybrid-alloyed steel powder have been investigated. High tensile strength and impact value were obtained in the conditions of the medium internal carbon content, higher sintering temperature, lower carbon potential or shorter carburizing time. The mechanical properties are deteriorated due to increasing hard martensite phases with high carbon content. It is believed that the reduction of these mechanical properties are mainly caused by increasing of brittle fracture by an internal notch effect of the pores, because the hard martensite phase have a high notch sensitivity.",
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AB - Effects of graphite additive contents and processing parameters on the mechanical properties of sintered and case-hardened compacts made of molybdenum hybrid-alloyed steel powder have been investigated. High tensile strength and impact value were obtained in the conditions of the medium internal carbon content, higher sintering temperature, lower carbon potential or shorter carburizing time. The mechanical properties are deteriorated due to increasing hard martensite phases with high carbon content. It is believed that the reduction of these mechanical properties are mainly caused by increasing of brittle fracture by an internal notch effect of the pores, because the hard martensite phase have a high notch sensitivity.

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