The effect of hot isostatic pressing on surface integrity, microstructure and strength of hybrid metal injection moulding and laser-based powder bed fusion stainless-steel components

Aldi Mehmeti, Donal Lynch, Pavel Penchev, Raff Martinez Ramos, Denis Vincent, Johannes Maurath, David Wimpenny, Khamis Essa, Stefan Dimov

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Abstract

Hybrid manufacture of components by combining capabilities of replication and Additive Manufacturing processes offer a flexible and sustainable route for producing cost-effectively small batches of metal parts. At present, there are open issues related to surface integrity and performance of such parts, especially when utilising them in safety critical applications. The research presented in this paper investigates the ductility amplification of hybrid components produced by using Metal Injection Moulding preforms and then build on them customisable sections by Laser-based Powder Bed Fusion. The properties of such hybrid components are studied and optimised through the use of non-conventional post treatment techniques. In particular, Hot Isostatic Pressing (HIP) is employed to improve mechanical strength and to produce hybrid components that have consistent properties across batches and throughout the samples, minimising microstructural heterogeneities between fabrication processes. Thus, the investigated post-processing method can offer extended service life of hybrid components, especially when operating under severe conditions. The optimised post treatment was found to increase the hybrid components’ strength compared to as-built ones by 68 % and ~11% in Yield strength (YS) and Ultimate tensile strength (UTS), respectively. Subsequently, led to a great pitting resistance; thus, making HIP samples suitable for corrosive environments. The advantages of the HIP treatments in comparison to the conventional heat-treatment of hybrid components are discussed and also some potential application areas are proposed.
Original languageEnglish
Article number7490
Number of pages15
JournalApplied Sciences
Volume11
Issue number16
DOIs
Publication statusPublished - 15 Aug 2021

Keywords

  • hot isostatic pressing (HIP)
  • hybrid manufacturing
  • L-PBF
  • MIM
  • 316 L
  • stainless steel
  • hybrid components manufacturing (HCM)
  • properties
  • microstructure

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