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Licensed Unlicensed Requires Authentication Published by De Gruyter May 23, 2016

Analysis of deformation induced martensite in AISI 316L stainless steel

Analyse des verformungsinduzierten Martensits im rostfeien Stahl AISI 316L
Darko Jagarinec, Peter Kirbiš, Jožef Predan, Tomaž Vuherer and Nenad Gubeljak
From the journal Materials Testing

Abstract

Metastable austenite stainless steel AISI 316L is sensitive to cold deformation, where transformation from austenite to martensite occurred. The bending deformation as the formation process leads to tensile and compression troughout the thickness of the billet. Tensile testing of the specimen causes differences in the true stress-strain along the contraction neck prior to fracture as well. The aim of the paper is to find correlation between microhardness as brief inspection parameters and extension of martensitic transformation. The total equivalent plastic strain extend diagram obtained by numerical simulation of bending was compared with tensile true stress-strain diagram. Results show very good correlation between hardness, true strain and martesite content. Therefore, one can conclude that by hardness measurement, it is possible to measure the level of equivalent plastic strain until ultimate tensile stress as a linear correlation between hardness, true strain and martesite content.

Kurzfassung

Metastabiler austenitischer rostfreier Stahl AISI 316L ist empfindlich gegenüber Kaltverformung. Die Kaltverformung ist verbunden mit einer Phasenumwandlung von Austenit in Martensit. Das Biegen als Gestaltungsprozess führt zu Zug- und Druckverformung über die Balkendicke. Der Zugversuch führt zu Unterschieden in der wahren Dehnung entlang der Einschnürung am Probenhals sowohl vor, als auch während des Bruchs. Ziel der vorliegenden Arbeit ist eine Korrelation zwischen der Mikrohärte als Parameter der Erstinspektion und der Martensitumwandlung zu finden. Das Diagramm der totalen plastischen Vergleichsdehnung wurde für Biegung über die numerische Simulation ermittelt und mit dem wahren Spannungs-Dehnungs-Diagramm für Zug verglichen. Die Ergebnisse zeigen eine sehr gute Korrelation zwischen Härte, wahrer Dehnung und Martensitgehalt. Daher kann geschlussfolgert werden, dass es durch Härtemessung möglich ist, die Höhe der plastischen Vergleichsdehnung bis zur Zugfestigkeit über die lineare Korrelation zwischen Härte, wahrer Dehnung und Martensitgehalt zu bestimmen.


*Correspondence Address, Prof. Nenad Gubeljak, University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia. E-mail:

Darko Jagarinec, born 1986, graduated with a BSc Degree from the University of Maribor, Faculty of Mechanical Engineering, Slovenia, in 2010. He continued to study at the same faculty as a PhD student. In the same year, he started working in the company Metalna IMPRO d.o.o. in Project Department for pressure vessel. His main research and work areas are fracture mechanics and pressure vessel design.

Peter Kirbiš, born 1989, is currently working as a doctor candidate. His work experience centers around metallographic/failure analysis and characterization of metals using various techniques with an emphasis on “in situ” electrical resistance measurements. His research is focused towards phase transformations in steels, with special attention towards the bainite reaction at very low temperatures, as well as welding and continuous casting of high carbon steels.

Assoc. Prof. Dr. Jožef Predan, born 1976, graduated with a BSc Dregree from the University of Maribor, Faculty of Mechanical Engineering, Slovenia, in 1999. He continued to study at the same faculty and completed his PhD in 2005. He is employed as an assistant and researcher at the same faculty. His main research areas are fatigue and fracture testing and analysis of fracture behavior of welded joints (especially strength mismatch of welded joints, heterogenous and also lamellas materials), Finite element analyses of homogeneous and inhomogeneous materials, especially fracture mechanics of 2D and 3D cracks.

Tomaž Vuherer, born 1970, graduated with a BSc Degree from the University of Maribor, Faculty of Mechanical Engineering, Slovenia, in 1999. He continued to study at the same faculty and completed his MSci in 1999. He continued work and study at the same faculty and completed his PhD in 2008. He finished his specialization as International Welding Engineer (IWE) in 2009, and his specialization as International Welding Inspector – comprehensive level (IWI-c) in 2015. From 2009 to 1010, he spent a year at TMF Technology Metallurgical Faculty, University of Belgrade, Serbia, as a guest researcher. He is employed as Head of Welding Laboratory at the Faculty of Mechanical Engineering, University of Maribor, Slovenia. His main research areas are welding, material characterization, fatigue and fracture testing, testing of welded joints and NDT inspection.

Prof. Dr. Nenad Gubeljak, born 1963, graduated with a BSc Degree fromthe University of Maribor, Faculty of Mechanical Engineering, Slovenia, in 1988. He continued to study at the same faculty and completed his PhD in 1998. From 2000 to 2001, he spent a year at GKKS Research Centre Geesthacht in Germany as a guest researcher. He is employed as Head of Institute of Mechanics and Chair of Mechanics at the Faculty of Mechanical Engineering, University of Maribor. His main research areas are fatigue and fracture testing, analysis of fracture behavior of welded joints and structure integrity assessment.


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Published Online: 2016-05-23
Published in Print: 2016-06-01

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