Overview of Properties, Features and Developments of PM HIP 316L and 316LN

Overview of Properties, Features and Developments of PM HIP 316L and 316LN

Martin Östlund, Tomas Berglund

Abstract. PM HIP 316L is an alloy that is of increased interest for nuclear applications since its recent ASME code case approval. Over the years, comprehensive data and understanding of the properties and features have been collected and evaluated which will be summarized in this article. Since the early developments of the PM HIP technology it has been observed that PM HIP alloys generally exhibit higher yield strengths compared to their conventional counterparts, a feature that applies well for 316L/LN. In this article this is demonstrated, both by using the Hall-Petch relationship as well as Pickering´s and Irvine´s empirically derived relationship between composition and grain size for austenitic stainless steels. Furthermore, a mechanism generating the increased yield strength in PM HIP vs conventionally manufactured 316L and 316LN will be proposed. Results also show that low oxygen contents itself is not a guarantee for good or increased performance in form of mechanical properties, but that there are other features that is of similar or perhaps even higher importance in order to achieve good properties. The results of this article include microstructural properties derived from EBSD measurements as well as tensile and impact properties in a wide range of test temperatures of PM HIP 316L and 316LN from several powder batches manufactured at different locations and processed with various HIP and heat treatment procedures. Finally, some results regarding creep properties of PM HIP 316L is presented.

Keywords
Powder Metallurgy, HIP, 316L, 316LN, Oxides, Inclusions, Microstructure, Impact Toughness, Tensile Properties, PPB

Published online 2/11/2019, 7 pages
Copyright © 2019 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Martin Östlund, Tomas Berglund, Overview of Properties, Features and Developments of PM HIP 316L and 316LN, Materials Research Proceedings, Vol. 10, pp 121-127, 2019

DOI: https://dx.doi.org/10.21741/9781644900031-17

The article was published as article 17 of the book Hot Isostatic Pressing

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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