Application of electromagnetic processing for development of high-performance sintered powder metal parts

Daudi Rigenda Waryoba, Winston Roberts

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electromagnetic processing was used to study the effects of electro-magneto forming on the dimensional control and thermal stability of sintered powder metal (PM) parts. The investigation was carried out on sinter-hardened, low chromium-molybdenum bainitic steel. The results show an increase in the microhardness of about 14% for the electromagnetic processed parts compared to the as-sintered parts. This was attributed to the 2% increase in the density, 17% and 29% reduction in the volume fraction of porosity and width of the bainitic lath, respectively, due to the electromagnetic processing. Dimensional characterization was carried out using a vertically aligned push-rod dilatometer. After four thermal cycles of heating and cooling, at a controlled rate of 5 °C/min to 1000 °C, the electromagnetic processed parts exhibited reduced dimensional change of about 44% lower than for the as-sintered parts. This is significantly important for applications that demand high dimensional tolerance and performance, especially at elevated temperatures.

Original languageEnglish (US)
Pages (from-to)1288-1297
Number of pages10
JournalCurrent Applied Physics
Volume17
Issue number10
DOIs
StatePublished - Oct 1 2017

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metal powder
Powder metals
electromagnetism
Dilatometers
Molybdenum
Steel
Chromium
Processing
Microhardness
Volume fraction
Thermodynamic stability
Porosity
bainitic steel
control stability
Cooling
Heating
dimensional stability
extensometers
microhardness
molybdenum

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

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title = "Application of electromagnetic processing for development of high-performance sintered powder metal parts",
abstract = "Electromagnetic processing was used to study the effects of electro-magneto forming on the dimensional control and thermal stability of sintered powder metal (PM) parts. The investigation was carried out on sinter-hardened, low chromium-molybdenum bainitic steel. The results show an increase in the microhardness of about 14{\%} for the electromagnetic processed parts compared to the as-sintered parts. This was attributed to the 2{\%} increase in the density, 17{\%} and 29{\%} reduction in the volume fraction of porosity and width of the bainitic lath, respectively, due to the electromagnetic processing. Dimensional characterization was carried out using a vertically aligned push-rod dilatometer. After four thermal cycles of heating and cooling, at a controlled rate of 5 °C/min to 1000 °C, the electromagnetic processed parts exhibited reduced dimensional change of about 44{\%} lower than for the as-sintered parts. This is significantly important for applications that demand high dimensional tolerance and performance, especially at elevated temperatures.",
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Application of electromagnetic processing for development of high-performance sintered powder metal parts. / Waryoba, Daudi Rigenda; Roberts, Winston.

In: Current Applied Physics, Vol. 17, No. 10, 01.10.2017, p. 1288-1297.

Research output: Contribution to journalArticle

TY - JOUR

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