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Full Densification in PM Steels Through Liquid Phase Sintering and HIP Approach
Chalmers University of Technology.ORCID iD: 0000-0001-5759-8160
Dalarna University, School of Technology and Business Studies, Materials Technology.ORCID iD: 0000-0001-7938-9909
Chalmers University of Technology.
CEIT, Pº Manuel Lardizábal 15, 20018 San Sebastián, Spain.
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2018 (English)In: Euro PM2018 Proceedings, 2018Conference paper, Published paper (Refereed)
Abstract [en]

High-density powder metallurgy (PM) components are required for high-performance applications. Liquid phase sintering (LPS) is one such method to improve the densification, especially the master alloy route is preferred due to the flexibility in tailoring the alloying contents. In this study, gas atomised Ni-Mn-B master alloy powder of size fraction < 45 µm was admixed with water atomised iron and Mo-prealloyed powder. During sintering, there was a significant densification due to LPS where the liquid formation occurred in two stages, one from the master alloy melting and another from the eutectic liquid formation, enabling densities > 95%. The microstructural investigation revealed that the surface densification was achieved after sintering in H2 containing atmosphere. Capsule free hot isostatic pressing was performed on these samples to achieve full density. This approach of combining LPS and capsule free hot isostatic pressing demonstrates the potential in reaching full densification in high-performance PM steel components.

Place, publisher, year, edition, pages
2018.
Keywords [en]
liquid phase sintering, master alloy, PM steel, HIP, full density, surface densification
National Category
Metallurgy and Metallic Materials
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-28801OAI: oai:DiVA.org:du-28801DiVA, id: diva2:1257404
Conference
Euro PM2018 Bilbao, Spain, 2018-10-14 - 2018-10-18
Available from: 2018-10-19 Created: 2018-10-19 Last updated: 2018-10-22Bibliographically approved

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Surreddi, Kumar Babu

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Vattur Sundaram, MaheswaranSurreddi, Kumar Babu
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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
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