PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 23 (2019) 354–359

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. stra - control and in the temperature range of 100 °C to 800 °C. The two TMF-t st condition IP- and OP-cycl g performed on the investigated materials did not differ that much in harden ng behaviour. Howev r, the plastic strain range were in general great r for IP- ycle cond tio . An observed barrelling eff ct was simula ed by a simplified finite lement analysis (FEA), hich showed influence of specim geometry. The degree of deformation of the test sp cimens was measured by the use of low angle grain boundary (LAGB) density calculations and it showed no barrelling effect before 500 OP-cycles. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Influence of ageing on thermomechanical fatigue of austenitic stainless steels Hugo Wärner a *, Robert Eriksson a , Guocai Chai a,b , Johan Moverare a , Sten Johansson a , Mattias Calmunger a a Department of Management and Engineering, Linköping University, 58183 Linköping Sweden b B Sandvik Materials Technology R&D Center, 81181 Sandviken, Sweden The increasing demands on efficiency and flexibility results in more detrimental operating conditions for the materials used in the boiler section of biomass power plants. Hence, the materials will be exposed to cyclic operation, increased temperature and higher pressure where austenitic stainless steels have shown to be promising candidates to cope with the increasing demands. However, their behaviour under these conditions are not yet fully understood. This work investigates the response of the commercial austenitic stainless steels Sanicro 25, Sanicro 31HT and Esshete 1250 and focus on the material degradation from cyclic operating condition and long-term usage. Pre- aged specimens (2000 hours at 800 °C) were exposed to thermomechanical fatigue (TMF) testing under strain- control and in the temperature range of 100 °C to 800 °C. The two TMF-test conditions IP- and OP-cycling performed on the investigated materials did not differ that much in hardening behaviour. However, the plastic strain range were in general greater for IP-cycle condition. An observed barrelling effect was simulated by a simplified finite element analysis (FEA), which showed influence of specimen geometry. The degree of deformation of the test specimens was measured by the use of low angle grain boundary (LAGB) density calculations and it showed no barrelling effect before 500 OP-cycles. 9th International Conference on Materials Structure and Micromechanics of Fracture Influence of ageing on thermomechanical fatigue of austenitic stainless steels Hugo Wärner a *, Robert Eriksson a , Guocai Chai a,b , Johan Moverare a , Sten Johansson a , Mattias Calmunger a a Department of Managem nt and Engineering, Linköping University, 58183 Linköping Sweden b B Sandvik Materials Technology R&D Center, 81181 Sandviken, Sweden Abstract The increasi g demand on efficiency and fl xibility r sult in more detrimental operating conditions for th aterials use in the boiler s ction of biomass power plants. Henc , t e ma erials will be exposed to cycli ration, increased temper ture and higher pr ssure where aust nitic stai less steels have shown to b pr mising candidates o cope with the increasing de ands. How ver, the r behaviour under these co diti ns are not yet fully understood. This work invest gates the response of the commercial austen tic stainless st els S nicro 25, Sanicro 31HT and Esshete 125 and focus on the ma erial degradatio from cyclic operating condition and long-term usage. Pre- aged specime s (2000 hours at ) were exposed to thermomechanical fatigue (TMF) t sting under Abstract

Keywords: Thermomechanical fatigue, austenitic stainless steels, ageing, barrelling effect Keywords: Thermomechanical fatigue, austenitic stainless steels, ageing, barrelling effect

* Corresponding author. Tel.: +46 13282213. E-mail address: hugo.warner@liu.se * Correspon ing author Tel.: +46 13282213. E-mail address: hugo.warner@liu.se

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.112