Steel powder and die-lubricated warm compaction for automotive sintered parts with high density and excellent fatigue property

Shigeru Unaml, Yukiko Ozaki, Satoshi Uenosono

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

JFE Steel has developed a new powder metallurgical process named die-lubricated warm compaction method for producing high-density sintered parts using premixed steel powder containing only small amount of internal lubricant. In this method, a newly developed spraying equipment precisely controls the amount of lubricant applied over the die wall. The sintered and brightquenched compacts were prepared by this method using partially alloyed steel powder. KIP SIGMALOY 415S, containing 4 mass% Ni, 1.5 mass% Cu, and 0.5 mass% Mo. They gave a density as high as 7.5 Mg/m 3 and rotating bending fatigue strengths of 450 MPa and 470 MPa with carbon contents of 0.52 mass% and 0.92 mass% respectively. The density and fatigue strength were superior to those obtained by the conventional double-pressing and double-sintering method. Presumably, the fatigue strength was enhanced by increasing the carbon content because the amount of retained austenite was increased.

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalJFE Technical Report
Issue number4
Publication statusPublished - Nov 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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