PSI - Issue 28

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2020) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2020) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 2378–2381

1st Virtual European Conference on Fracture Fatigue and fracture crack paths in spheroidized steel 1st Virtual European Conference on Fracture Fatigue and fracture crack paths in spheroidized steel

Jesús Toribio*, Beatriz González, Juan-Carlos Matos Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Jesús Toribio*, Beatriz González, Juan-Carlos Matos Fracture & Structural Integrity Research Group (FSIRG), University of alamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

© 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 © 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 T is paper analyses the fatigue and fracture behavior of a steel with quasi-eutectoid c mposition (slightly hypereutectoid) and spheroidized microstructure. The fatigue crack surface showed ductile micro-tearings produced by propagating the crack through the t in layer of proeutectoid c mentite. The fr cture is initiate at the fatigu crack tip in a fibrous zone by microvoid nucleation, which is transformed int a cleavage fractography. Microvoids are observed in the large particles of cementite located in the proeutectoid layer, by decohesion with the matrix or by fracture. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https:// r ativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract This paper analyses the fatigue and fracture behavior of a steel with quasi-eutectoid composition (slightly hypereutectoid) and spheroidized microstructure. The fatigue crack surface showed ductile micro-tearings produced by propagating the crack through the thin layer of proeutectoid cementite. The fracture is initiated at the fatigue crack tip in a fibrous zone by microvoid nucleation, which is transformed into a cleavage fractography. Microvoids are observed in the large particles of cementite located in the proeutectoid layer, by decohesion with the matrix or by fracture. 1. Introduction The treatment of spheroidization in pearlite produces fragmentation, spheroidization and coalescence in cementite by diffusion processes, phenomenon observed by Chattopadhyay and Sellars (1982) that can affect their mechanical properties. Spheroidization increases the ductility and the fracture strength, while decreasing the yield strength. 1. Introduction The treatment of spheroidization in pearlite produces fragmentation, spheroidization and coalescence in cementite by diffusion processes, phenomenon observed by Chattopadhyay and Sellars (1982) that can affect their mechanical properties. Spheroidization increases the ductility and the fracture strength, while decreasing the yield strength. Keywords: Spheroidized steel; proeutectoid cementite layer; fatigue craking; fracture craking. Keywords: Spheroidized steel; proeutectoid cementite layer; fatigue craking; fracture craking.

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es * Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es

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 ope acc s article under t e CC BY-NC-ND lice s (https:// r ativecommons.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.2020.11.085