Journal Article

PUBDB-2023-07275

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effect of cyclic loading on microstructure and crack propagation in additively manufactured biomaterial Co–Cr–Mo alloy

Coutinho Saraiva, B. R.Extern* ; Novotny, L.Extern* ; Carpentieri, B. (Corresponding author)Extern* ; Keller, T. F.DESY* ; Fáberová, M.Extern* ; Bureš, R.Extern* ; Rodrigues, S. F. (Corresponding author)Extern* ; Rodrigues de Barros Neto, J.Extern* ; Martinez Antunes, L. H.Extern* ; Masoumi, M.Extern* ; Gomes de Abreu, H. F.Extern* ; Beres, M.Extern*

2023
Elsevier Rio de Janeiro

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Please use a persistent id in citations: doi:10.1016/j.jmrt.2023.08.185  doi:10.3204/PUBDB-2023-07275

Abstract: CobalteChromiumeMolybdenum (CoeCreMo) alloys are commonly used for artificial hipand knee joint metallic implants. These components are subjected to repetitive loads duringservice. Therefore, materials used for such applications must exhibit a high fatigue crackresistance. In this research, Coe$_{28}$Cre$_6$Mo (wt.-%) powder was utilized as a feedstock in alaser powder bed fusion process to produce test coupons. The coupons were then subjectedto load-controlled cyclic material tests in the low cycle fatigue regime to study mechanicalresponse and microstructural changes of the material. With the progressing number of cycles,a continuous increase in macroscopic plastic strain was observed. The electron backscattereddiffraction analysis revealed that cyclic loading caused deformation-induced facecenteredcubic (FCC)/hexagonal close-packed (HCP) phase transformation. In addition, thephase transition generated an accumulation of plastic strain at the FCC/HCP interface givingrise to crack nucleation. The crack propagation path along HCP orientation variants withhigh mechanical work and strain hardening mechanism is discussed.

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Contributing Institute(s):

1. Nanolab (FS-NL)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. DESY NanoLab: Microscopy
2. DESY NanoLab: Sample Preparation

Appears in the scientific report 2023

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