PSI - Issue 42

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2019) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

www.elsevier.com/locate/procedia . l i r. /l t / r i

ScienceDirect

Procedia Structural Integrity 42 (2022) 1054–1060

23 European Conference on Fracture - ECF23 Effect of heat treatment on fatigue crack growth performance of AlSi10Mg aluminum alloy submitted to LPBF Rui F. Fernandes a *, Joel Jesus a,b , Luís Borrego a,c , José M. Ferreira a , José D. Costa a a University of Coimbra, CEMMPRE, Department of Mechanical Engineering, Coimbra, Portugal b Department of Mechanical Engineering, Lisbon Polytechnic – ISEL, R. Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal c Department of Mechanical Engineering, Coimbra Polytechnic - ISEC, Rua Pedro Nunes, Quinta da Nora, 3030-199 Coimbra, Portugal Abstract Aluminum alloys are used in several industries, namely in the aeronautic and aerospace industries due to its good corrosion resistance and good mechanical strength/weight ratio. The optimization of fatigue crack growth resistance in AlSi10Mg aluminum alloy is a vital issue for safety-relevant components, which are designed to work for a large number of loading cycles before periodic inspections. An unclear subject is the benefit effect of heat treatments in the fatigue crack growth of AlSi10Mg aluminum alloy submitted to LPBF. Therefore, the current work purposes to analyze the effect of a heat treatment at low temperature on fatigue crack growth of AlSi10Mg aluminum alloy submitted to LPBF. Fatigue crack growth tests in Mode I are performed in compact tension (CT) specimens at two different conditions: as-build and heat treated at low temperature. The possible befits effect is analyzed, as well as the effect of the average stress on the fatigue crack growth. The crack closure parameter is studied in order to analyze the different fatigue crack growth behaviors, as well as the microstructure, hardness, and fractography. From this work, the main achievement is the microstructural transformations associated with the standard heat treatments (T6 and stress relived at 300 ºC) are unfavorable to fatigue strength in the AlSi10Mg aluminum alloy submitted to LPBF, while the non-standard stress relief heat treatment, performed at a lower temperature, cause a benefic effect in the fatigue crack growth resistance. , , a i it f i , , t t f i l i i , i , t l b t t f i l i i , i l t i I , . l i í i , - i , t l c t t f i l i i , i l t i - I , , i t , - i , t l l i ll i l i i , l i i i i i i i i l / i i . i i i i i i l i l i ll i i l i l , i i l l i l i i i i . l j i i i i l i l i ll i . , l nt l i l i l i ll i . i i i i i i i i : il l . i l i i l , ll i . l i i i l i i i , ll i , , . i , i i i i l i i i li º l i i l i l i ll i , il li , l , i i i i . © 2022 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 scientific committee of the 23 European Conference on Fracture – ECF23

* Corresponding author. E-mail address: uc2020158278@student.uc.pt i t r. - il : t t. . t rr

2452-3216 © 2020 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 23 European Conference on Fracture - ECF23 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li

2452-3216 © 2022 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 scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.133