Volume 46, Issue 10 pp. 3953-3965
ORIGINAL ARTICLE

The influence of printing strategies on fatigue crack growth behavior of an additively manufactured AISI 316L stainless steel

José Camacho

José Camacho

UNIDEMI, Department of Mechanical and Industrial Engineering, Nova School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal

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Rui F. Martins

Corresponding Author

Rui F. Martins

UNIDEMI, Department of Mechanical and Industrial Engineering, Nova School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal

Laboratório Associado de Sistemas Inteligentes, LASI, Guimarães, Portugal

Correspondence

Rui F. Martins, UNIDEMI, NOVA School of Science and Technology, Portugal.

Email: [email protected]

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Ricardo Branco

Ricardo Branco

Department of Mechanical Engineering, CEMMPRE, University of Coimbra, Coimbra, Portugal

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António Raimundo

António Raimundo

Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Marinha Grande, Portugal

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Cândida Malça

Cândida Malça

Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Marinha Grande, Portugal

Department of Mechanical Engineering, Coimbra Polytechnic, ISEC, Coimbra, Portugal

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First published: 01 August 2023
Citations: 2

Abstract

Selective laser melting (SLM) is an additive manufacturing powder-bed fusion process that allows producing complex metallic parts with a relative density of up to 99.9%. Nevertheless, the mechanical properties of these components depend on numerous process variables, and there is a lack of systematic studies focused on SLM stainless steels. In the work herein presented, three specific printing strategies were X-Y patterned to manufacture Compact Tension specimens transversally, longitudinally, or chess-oriented, without any post-processing heat treatment. The specimens were made of AISI 316L austenitic stainless steel. Thereafter, fatigue crack growth rate (FCGR) tests were carried out at room temperature, at constant amplitude loading (R = 0.2), to determine the fatigue crack propagation constants of the Paris Law associated with each print strategy. It was possible to conclude that transversal additively manufactured specimens showed the lowest FCGRs, and all results were well below the fatigue design curve given in ASME BPVC, Section XI.

Highlights

  • Three different printing strategies were used to manufacture CT specimens tested.
  • Fatigue crack growth rates (FCGRs) of additively manufactured AISI 316L SS were determined.
  • All FCGRs curves obtained were below the fatigue design curve given in ASME BPVC XI.
  • Mechanisms of crack propagation were determined.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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