Characterization of Boron Doped 316L Powder Metallurgy (PM) Stainless Steel

Deniz Uzunsoy; H. Aygül Yeprem

doi:10.3139/120.100912

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Characterization of Boron Doped 316L Powder Metallurgy (PM) Stainless Steel

Deniz Uzunsoy und H. Aygül Yeprem

Veröffentlicht/Copyright: 26. Mai 2013

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Abstract

Powder Metallurgy (PM) is a shaping technology which is based on forming powder particles in a mold under high pressure. This method influences cost of parts significantly due to direct molding. Sintering is one of the most critical steps of a PM process. Mechanical and physical properties of the final product are enhanced by the optimisation of sintering conditions (temperature, time, and type of the atmosphere). The demand for PM products with high performance is increasing day by day. In this context, one way to increase the strength of the part is to perform sintering process by alloying powder. Boron was found to be useful for the activation of sintering process of iron powder in the previous study. In recent times, research is increasingly focused on the Boron addition to improve the density of PM stainless steel parts after sintering process. In this study, the influence of Boron addition into PM 316L stainless steel materials on the microstructure and properties of the final part has been investigated in detail. Boron addition is varied from 0.2 to 1 wt.-%, and the effect of Boron on the densification and distortion behaviour of stainless steel has also been studied. All samples are characterised by using several techniques such as SEM, EDX, image analysis.

Kurzfassung

Die Pulvermetallurgie ist eine Formgebungstechnologie, die auf der Formierung von Pulverpartikeln in einer Schmelze unter hohem Druck basiert. Aufgrund des direkten Schmelzens lassen sich die Kosten der Teileherstellung mit diesem Verfahren signifikant reduzieren. Das Sintern ist einer der kritischen Schritte während der Pulvermetallurgie. Die mechanischen und physikalischen Eigenschaften des Endproduktes können durch die Optimierung der Sinter-Bedingungen (Temperatur, Zeit und Atmosphärentyp) erheblich verbessert werden. Der Berdarf an Pulvermetallurgie-Produkten mit hohen Gebrauchseigenschaften steigt täglich. In diesem Zusammenhang besteht eine Möglichkeit, die Festigkeit eines Teiles zu erhöhen darin, Pulver während des Sintern hinzu zu legieren. In einer vorherigen Studie hat sich herausgestellt, dass Bor geeignet ist, um das Sintern von Eisenpulver zu aktivieren. In der letzten Zeit konzentrierten sich die Forschungsarbeiten zunehmend auf die Zugabe von Bor, um die Dichte von Teilen aus hochlegierten Stählen nach dem Sintern zu erhöhen. In dem vorliegenden Beitrag wird über eine Studie berichtet, in der der Einfluß von Bor-Zugaben in den Prozess der Pulvermetallurgie auf die Mikrostruktur und die Eigenschaften der Endprodukte aus einem hochlegierten Stahl des Typs 316 L untersucht wurde. Alle Proben wurden anhand verschiedener Verfahren charakterisiert, u. a. mittels REM, EDX und Bildanalyse.

Dr. Uzunsoy obtained her BSc and MSc degree from Yildiz Technical University, Turkey in 1995 and 1997, respectively. She completed her PhD at The University of Birmingham, UK in 2003. Currently, she is working at Yildiz Technical University, Turkey as an assistant professor. Her main research interest includes powder metallurgy, processing of metallic nanopowders, material chracterizations.

Dr. H. Aygül Yeprem is currently working as an assistant professor at Yildiz Technical University, Department of Metallurgy and Materials Engineering, Istanbul, Turkey. She received both, her BSc and MSc degrees from the Yildiz Technical University, Department of Chemical Engineering in 1985 and 1988, respectively. She obtained her PhD degree from the same university, Department of Metallurgy and Materials Engineering in 2003. Her main research interest includes refractories, ceramics and material characterization.

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Published Online: 2013-05-26

Published in Print: 2008-09-01

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https://doi.org/10.3139/120.100912