Influence of density and nickel content on fatigue strength of powder-forged gears - Comparison with ingot steel and sintered steel

Masanori Seki, Masahiro Fujii

Research output: Contribution to journalArticle

Abstract

In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-Tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. The densities of the sintered and powder-forged rollers and gears were in the range 7.01 g/cm3 to 7.84 g/cm3, and the nickel contents of the metal powders were chosen as 0.5 % and 3.0 %. These experimental results were compared with the results for ingot steel ones. The hardness near the surface of the test specimens with a nickel content of 3.0 % was lower than that of the other ones. The pores in the sintered rollers became smaller or disappeared upon hot forging. The failure modes of the rollers and gears were mainly spalling due to subsurface cracking and pitting due to surface cracking, respectively. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was roughly equivalent to that of the ingot steel ones, respectively. The fatigue strength of the test specimens increased as their density increased. It was clear that the fatigue strength of the sintered and powder-forged rollers and gears was proportional to the hardness at the failure depth for nickel contents of 0.5 % and 3.0 %. In other words, the fatigue strength of the rollers and gears with a nickel content of 3.0 % was similar to those of the others because of the toughness effect of nickel under the same material density.

Original languageEnglish
JournalJournal of Advanced Mechanical Design, Systems and Manufacturing
Volume11
Issue number6
DOIs
Publication statusPublished - Nov 1 2017

Fingerprint

Steel ingots
Gears
Nickel
Powders
Steel
Hardness
Spalling
Fatigue strength
Powder metals
Testing
Forging
Pitting
Failure modes
Toughness
Fatigue of materials

Keywords

  • Density
  • Fatigue strength
  • Gear
  • Nickel content
  • Powder forging
  • Sintering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

@article{c266dc05ca4e4619b2574ee270c4c4e5,
title = "Influence of density and nickel content on fatigue strength of powder-forged gears - Comparison with ingot steel and sintered steel",
abstract = "In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-Tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. The densities of the sintered and powder-forged rollers and gears were in the range 7.01 g/cm3 to 7.84 g/cm3, and the nickel contents of the metal powders were chosen as 0.5 {\%} and 3.0 {\%}. These experimental results were compared with the results for ingot steel ones. The hardness near the surface of the test specimens with a nickel content of 3.0 {\%} was lower than that of the other ones. The pores in the sintered rollers became smaller or disappeared upon hot forging. The failure modes of the rollers and gears were mainly spalling due to subsurface cracking and pitting due to surface cracking, respectively. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was roughly equivalent to that of the ingot steel ones, respectively. The fatigue strength of the test specimens increased as their density increased. It was clear that the fatigue strength of the sintered and powder-forged rollers and gears was proportional to the hardness at the failure depth for nickel contents of 0.5 {\%} and 3.0 {\%}. In other words, the fatigue strength of the rollers and gears with a nickel content of 3.0 {\%} was similar to those of the others because of the toughness effect of nickel under the same material density.",
keywords = "Density, Fatigue strength, Gear, Nickel content, Powder forging, Sintering",
author = "Masanori Seki and Masahiro Fujii",
year = "2017",
month = "11",
day = "1",
doi = "10.1299/jamdsm.2017jamdsm0073",
language = "English",
volume = "11",
journal = "Journal of Advanced Mechanical Design, Systems and Manufacturing",
issn = "1881-3054",
publisher = "Japan Society of Mechanical Engineers",
number = "6",

}

TY - JOUR

T1 - Influence of density and nickel content on fatigue strength of powder-forged gears - Comparison with ingot steel and sintered steel

AU - Seki, Masanori

AU - Fujii, Masahiro

PY - 2017/11/1

Y1 - 2017/11/1

N2 - In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-Tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. The densities of the sintered and powder-forged rollers and gears were in the range 7.01 g/cm3 to 7.84 g/cm3, and the nickel contents of the metal powders were chosen as 0.5 % and 3.0 %. These experimental results were compared with the results for ingot steel ones. The hardness near the surface of the test specimens with a nickel content of 3.0 % was lower than that of the other ones. The pores in the sintered rollers became smaller or disappeared upon hot forging. The failure modes of the rollers and gears were mainly spalling due to subsurface cracking and pitting due to surface cracking, respectively. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was roughly equivalent to that of the ingot steel ones, respectively. The fatigue strength of the test specimens increased as their density increased. It was clear that the fatigue strength of the sintered and powder-forged rollers and gears was proportional to the hardness at the failure depth for nickel contents of 0.5 % and 3.0 %. In other words, the fatigue strength of the rollers and gears with a nickel content of 3.0 % was similar to those of the others because of the toughness effect of nickel under the same material density.

AB - In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-Tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. The densities of the sintered and powder-forged rollers and gears were in the range 7.01 g/cm3 to 7.84 g/cm3, and the nickel contents of the metal powders were chosen as 0.5 % and 3.0 %. These experimental results were compared with the results for ingot steel ones. The hardness near the surface of the test specimens with a nickel content of 3.0 % was lower than that of the other ones. The pores in the sintered rollers became smaller or disappeared upon hot forging. The failure modes of the rollers and gears were mainly spalling due to subsurface cracking and pitting due to surface cracking, respectively. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was roughly equivalent to that of the ingot steel ones, respectively. The fatigue strength of the test specimens increased as their density increased. It was clear that the fatigue strength of the sintered and powder-forged rollers and gears was proportional to the hardness at the failure depth for nickel contents of 0.5 % and 3.0 %. In other words, the fatigue strength of the rollers and gears with a nickel content of 3.0 % was similar to those of the others because of the toughness effect of nickel under the same material density.

KW - Density

KW - Fatigue strength

KW - Gear

KW - Nickel content

KW - Powder forging

KW - Sintering

UR - http://www.scopus.com/inward/record.url?scp=85040240156&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85040240156&partnerID=8YFLogxK

U2 - 10.1299/jamdsm.2017jamdsm0073

DO - 10.1299/jamdsm.2017jamdsm0073

M3 - Article

AN - SCOPUS:85040240156

VL - 11

JO - Journal of Advanced Mechanical Design, Systems and Manufacturing

JF - Journal of Advanced Mechanical Design, Systems and Manufacturing

SN - 1881-3054

IS - 6

ER -