PSI - Issue 28

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 28 (2020) 2110–2117

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Cyclic life under loading-unloading cycles of a precipitation hardening austenitic steel Fe – 0.40 С – 18 Mn – 2 Si – 2 V steel (mass percent) specimens was studied experimentally and simulated by means of a microstructural model. This steel with the shape memory possessing rather high strength around 1000 MPa demonstrates also rather good fatigue properties withstanding 20000 cycles at the maximum stress of the loading-unloading cycle 800 MPa. The microstructural model of the deformation of FeMnSi-based SMA, which takes into account the specific features of the martensitic transformation and the micro plastic deformation, and supplemented with a deformation-and-stress criterion of fracture proved to be an adequate tool for describing the fatigue fracture of steels undergoing fcc-hcp martensitic transformation. A good agreement between the calculation and the experimental data was obtained. Thus, this model can be expected to be suitable for estimations of the cyclic life of SMA working elements under various thermal and mechanical loadings. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: FeMn; FeMnSi; shape memory; reorientation; plasticity; defects; fatigue; fracture criterion. 1. Introduction Nonferrous TiNi-based alloys are the most widely used for practical applications among “smart” shape memory alloys (SMA). Meanwhile, some technical conditions demand machining which is too expensive or even impossible 1st Virtual European Conference on Fracture Experimental Study and Modeling of the Fatigue Fracture of High-Strength FeMnSi-based Shape Memory Alloy Fedor S. Belyaev a , Margarita E. Evard a *, Eugeny S. Ostropiko a , Aleksandr E. Volkov a a Saint Petersburg State University, 7/9 Universitetskaya Emb., 199034, Saint Petersburg, Russian Federation

* Corresponding author. Tel.: +7-812-428-4220; fax: +7-812-428-7079. E-mail address: m.evard@spbu.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.037