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Influence of Sintering Atmosphere on Densification Development of 17-4 PH Stainless Steel Powder

  • : Szewczyk-Nykiel, A1
  • : 1Cracow University of Technology
  • : PDF Download
  • : 2012

Abstract

The 17-4 PH precipitation-hardening alloy has been widely used for metal injection molding applications. In fact a conventional PM process up to now has not been considered as an acceptable method for manufacturing structural parts from 17-4 PH based powders due to their inability to produce components with near-full sintered densities. However, the undertaken research indicates that it is possible to obtain high strength of sintered compacts by the conventional pressing and sintering technique. In the present work water atomized powder delivered by Ametex was compacted and sintered in different atmospheres: hydrogen, hydrogen/nitrogen and vacuum. The aim of research was to establish the relationship between the sintering densification of 17-4 PH alloy powder occurring in different sintering atmospheres and temperature-time schedule. Base on experimental results it was found that sintering atmosphere and temperature play an important role in densification behavior of investigated powder. The highest sintered density resulting from the highest densification rate during sintering was obtained when sintering under pure hydrogen. The higher sintering temperature supports the delta ferrite formation and is favorable for pore rounding and higher densification.
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