University of Oulu

Uusikallio, Sampo; Miettunen, Ilkka; Anttila, Severi; Manninen, Timo; Nevasmaa, Pekka (2017) Suitability of size adjustment in impact toughness transition region for sub-sized ferritic stainless steel Charpy-V results. In: Conference proceedings of the 9th European Stainless Steel Conference - Science & Market & 5th European Duplex Stainless Steel Conference & Exhibition. 25-27 May 2017, Bergamo, Italy, Article nro 027.

Suitability of size adjustment in impact toughness transition region for sub-sized ferritic stainless steel Charpy-V results

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Author: Uusikallio, Sampo1; Miettunen, Ilkka1; Anttila, Severi1;
Organizations: 1University of Oulu, Finland
2Outokumpu, Tornio R&D Center, Finland
3VTT, Espoo, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.7 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202001283749
Language: English
Published: Associazione Italiana di Metallurgia, 2017
Publish Date: 2020-01-28
Description:

Abstract

In this paper, it is examined whether SINTAP/FITNET size adjustment formula can be reliably used for two 11% Cr utility ferritic stainless steels in order to derive safe, yet not overly conservative T28J transition temperature estimates. Charpy-V notched specimens were machined into five thicknesses and the T35J/cm2 transition temperatures were determined using hyperbolic tangent fitting function. The transition temperatures were then compared against the ideal size adjustment given by the formula. Microstructural characterization and fractographic examinations were carried out using laser confocal and scanning electron microscopy.

It is seen that the size adjustment formula only partially satisfied the examined steels. Specifically, the specimens in 6–10 mm thickness range had little or no change in the transition temperatures and the projected size adjustment did not meet the actual results in these cases. To some extent, extensive splitting/delamination that occurred with steel A in the transition region could have affected the correlation, but it did not affect the results with steel B. Average grain sizes were relatively similar and uniform in the two examined steels through-thickness, but finer 90th percentile grain size and lower interstitial content in steel B was thought to be responsible for improved toughness over steel A.

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ISBN Print: 978-88-98990-12-2
Article number: 027
Host publication: Conference proceedings of the 9th European Stainless Steel Conference : Science & Market & 5th European Duplex Stainless Steel Conference & Exhibition. 25-27 May 2017, Bergamo, Italy
Conference: European Stainless Steel Conference - Science & Market & European Duplex Stainless Steel Conference & Exhibition
Type of Publication: B3 Article in conference pro-ceedings
Field of Science: 216 Materials engineering
Subjects:
Funding: The works of the S.U. and I.M. were also partly funded and supported by the Fundamentals and Modelling Doctoral School (FUNMODE) of DIMECC. The work of S.A. was partly funded by the University of Oulu Graduate School of Advanced Materials Doctoral Programme (ADMA-DP). The authors are grateful to the Finnish Funding Agency for Technology and Innovation (TEKES) and Outokumpu Stainless Oy for financial support
Copyright information: © Aimnet. Published in this repository with the kind permission of the publisher.