Effect of copper addition on mechanical properties of sintered and case-hardened compacts made of low molybdenum prealloyed steel powder

Shigeru Unami, Yukiko Ozaki

Research output: Contribution to journalArticle

Abstract

The effect of copper powder addition on properties of sintered and case-hardened compacts made of the 0.45 mass%Mo prealloyed steel powder has been investigated. The tensile strength of sintered and case-hardened compacts made of the powder increased with 1 mass%Cu addition, but leveled off with 2mass%Cu addition. The rotating bending fatigue strength of sintered and case-hardened compacts made of the powder increased with 1 mass%Cu addition. However, the fatigue strength decreased with 2mass%Cu addition and was lower than that of Cu free material. The tensile and fatigue strengths of sintered and case-hardened compacts made of the powder with 1 mass%Cu addition are equal to those made of the conventional 4mass%Ni diffusion-alloyed steel powder. The reduction of fatigue strength with 2mass%Cu addition should be attributed to an increase in size of the maximum pore due to Cu liquid phase and probably an increase in fatigue crack growth rate due to Cu addition.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume56
Issue number6
DOIs
Publication statusPublished - Jun 1 2009

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Molybdenum
Steel
Powders
Copper
Mechanical properties
Tensile strength
Copper powder
Fatigue crack propagation
Fatigue strength
Liquids

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Effect of copper addition on mechanical properties of sintered and case-hardened compacts made of low molybdenum prealloyed steel powder",
abstract = "The effect of copper powder addition on properties of sintered and case-hardened compacts made of the 0.45 mass{\%}Mo prealloyed steel powder has been investigated. The tensile strength of sintered and case-hardened compacts made of the powder increased with 1 mass{\%}Cu addition, but leveled off with 2mass{\%}Cu addition. The rotating bending fatigue strength of sintered and case-hardened compacts made of the powder increased with 1 mass{\%}Cu addition. However, the fatigue strength decreased with 2mass{\%}Cu addition and was lower than that of Cu free material. The tensile and fatigue strengths of sintered and case-hardened compacts made of the powder with 1 mass{\%}Cu addition are equal to those made of the conventional 4mass{\%}Ni diffusion-alloyed steel powder. The reduction of fatigue strength with 2mass{\%}Cu addition should be attributed to an increase in size of the maximum pore due to Cu liquid phase and probably an increase in fatigue crack growth rate due to Cu addition.",
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AU - Unami, Shigeru

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N2 - The effect of copper powder addition on properties of sintered and case-hardened compacts made of the 0.45 mass%Mo prealloyed steel powder has been investigated. The tensile strength of sintered and case-hardened compacts made of the powder increased with 1 mass%Cu addition, but leveled off with 2mass%Cu addition. The rotating bending fatigue strength of sintered and case-hardened compacts made of the powder increased with 1 mass%Cu addition. However, the fatigue strength decreased with 2mass%Cu addition and was lower than that of Cu free material. The tensile and fatigue strengths of sintered and case-hardened compacts made of the powder with 1 mass%Cu addition are equal to those made of the conventional 4mass%Ni diffusion-alloyed steel powder. The reduction of fatigue strength with 2mass%Cu addition should be attributed to an increase in size of the maximum pore due to Cu liquid phase and probably an increase in fatigue crack growth rate due to Cu addition.

AB - The effect of copper powder addition on properties of sintered and case-hardened compacts made of the 0.45 mass%Mo prealloyed steel powder has been investigated. The tensile strength of sintered and case-hardened compacts made of the powder increased with 1 mass%Cu addition, but leveled off with 2mass%Cu addition. The rotating bending fatigue strength of sintered and case-hardened compacts made of the powder increased with 1 mass%Cu addition. However, the fatigue strength decreased with 2mass%Cu addition and was lower than that of Cu free material. The tensile and fatigue strengths of sintered and case-hardened compacts made of the powder with 1 mass%Cu addition are equal to those made of the conventional 4mass%Ni diffusion-alloyed steel powder. The reduction of fatigue strength with 2mass%Cu addition should be attributed to an increase in size of the maximum pore due to Cu liquid phase and probably an increase in fatigue crack growth rate due to Cu addition.

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