Effects of nickel or copper addition on mechanical properties of sintered and carburized compacts made of molybdenum hybrid-alloyed steel powder

Shigeru Unami, Yukiko Ozaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effects of Ni or Cu powder addition on the mechanical properties of the sintered and carburized compacts made of the Mo hybrid-alloyed steel powder, which is based on 0.6 mass% Mo prealloyed steel powder diffusion-bonded with 0.2 mass% Mo powder particles, have been investigated. The tensile and rotating bending fatigue strengths of the 1% Ni added material increase compared to the additive-free material. In the case of 2% Ni addition, the tensile strength is almost same and the fatigue strength decreases compared to 1%Ni added material. The shrinkage of pores is observed with Ni additions, and should result in the improvement of the fatigue strength. However, more than 1%Ni addition forms Nirich austenitic phase, which causes the strength reductions. The tensile and rotating bending fatigue strengths decrease with Cu additions. The Cu added material shows the structure including coarse pores formed by outflow of melted Cu during sintering. Such coarse pores should cause the strength reductions.

Original languageEnglish
Title of host publicationAdvances in Powder Metallurgy and Particulate Materials - 2008, Proceedings of the 2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008
Pages10129-10139
Number of pages11
Publication statusPublished - 2008
Externally publishedYes
Event2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008 - Washington, DC, United States
Duration: Jun 8 2008Jun 12 2008

Other

Other2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008
CountryUnited States
CityWashington, DC
Period6/8/086/12/08

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All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Surfaces and Interfaces

Cite this

Unami, S., & Ozaki, Y. (2008). Effects of nickel or copper addition on mechanical properties of sintered and carburized compacts made of molybdenum hybrid-alloyed steel powder. In Advances in Powder Metallurgy and Particulate Materials - 2008, Proceedings of the 2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008 (pp. 10129-10139)