Effects of solid loading and cooling rate on the mechanical properties and corrosion behavior of powder injection molded 316 L stainless steel

Muhammad Rafi Raza, Faiz Ahmad, Norhamidi Muhamad, Abu Bakar Sulong, M. A. Omar, Majid Niaz Akhtar, Muhammad Aslam

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Solid loading and post-sintered cooling rates are two effective parameters used to control the mechanical properties of powder-injection molded parts. In the case of 316 L stainless steel (SS), these parameters also influence mechanical properties and corrosion resistance. In this study, four formulations with powder loading above and below the critical powder loading were prepared and sintered at 1325. °C in vacuum with cooling rates varying from 3. °C/min to 10. °C/min. Solid loadings above the critical loading caused reductions in final properties (i.e. mechanical properties and corrosion resistance) because of increased porosity. The high cooling rate of 10. °C/min improved the mechanical properties due to the formation of large number of grains and corrosion resistance due to formation of chromium oxide layer at the surface of PIM 316 L SS. Solid loading of 65 vol.%, sintered at 1325. °C with a cooling rate of 10. °C/min showed improvements in terms of mechanical properties and corrosion resistance compared with conventional 316 L SS. Such improvements were considered due to reduced grain sizes and formation of a chromium oxide layer on the sample surface. This study identifies the solid loading (65. vol.%) below the critical powder loading and a high post-sintered cooling rate, i.e., 10. °C/min, are suitable to achieve optimum mechanical properties and corrosion resistance in 316 L SS. The developed material may be recommended for biomedical applications.

Original languageEnglish
Pages (from-to)135-142
Number of pages8
JournalPowder Technology
Volume289
DOIs
Publication statusPublished - 1 Feb 2016

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Stainless Steel
Powders
Stainless steel
Corrosion resistance
Corrosion
Cooling
Mechanical properties
Chromium
Oxides
Porosity
Vacuum

Keywords

  • Cooling rate
  • Corrosion behavior
  • Mechanical properties
  • Morphology
  • Powder-injection molding
  • Solid loading

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Effects of solid loading and cooling rate on the mechanical properties and corrosion behavior of powder injection molded 316 L stainless steel. / Raza, Muhammad Rafi; Ahmad, Faiz; Muhamad, Norhamidi; Sulong, Abu Bakar; Omar, M. A.; Akhtar, Majid Niaz; Aslam, Muhammad.

In: Powder Technology, Vol. 289, 01.02.2016, p. 135-142.

Research output: Contribution to journalArticle

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