Assessments of porosity effects on mechanical behavior and scratch tests onto the AISI 316L steel obtained using additive manufacturing (DMLS) and sintering (SPS)

• Grant number: 20/10653-5
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2021
• End date: October 31, 2023
• Field of knowledge: Engineering - Mechanical Engineering - Manufacturing Processes
• Principal Investigator: Vanessa Seriacopi
• Grantee: Vanessa Seriacopi
• Host Institution: Escola de Engenharia Mauá (EEM). Instituto Mauá de Tecnologia. São Caetano do Sul , SP, Brazil
• Associated researchers: Adalto de Farias ; Éd Claudio Bordinassi ; Erika Fernanda Prados ; Izabel Fernanda Machado ; Newton Kiyoshi Fukumasu ; Roberto Martins de Souza ; Susana Marraccini Giampietri Lebrão ; Wilson Carlos da Silva Junior

Abstract

This project aims to analyze the porosity effect based on scratch tests onto AISI 316L steel specimens, which are obtained from two manufacturing processes: additive using Direct Metal Laser Sintering (DMLS), and sintering via Spark Plasma Sintering (SPS). The experimental procedure consists in conducting microscratch tests of the austenitic stainless steel specimens, comparing the mechanical behavior and tribological responses (e.g friction coefficient and material removal) of the materials derived from different manufacturing processes. In these tests, the input parameter is the constant normal force to be applied to characterize the dominant abrasive mechanism for each condition. In turn, this tribological approach tends to incorporate mechanical and microstructural aspects, consisting of plastic deformation, topography, and surface finishing, for instance. Therefore, the experimental-numerical methodology employs the mechanical characterization by instrumented indentation, and Vickers microhardness; microstructural characterization using SEM and DRX; roughness measurements of specimens with different porosities; and evaluation about abrasion micro-mechanisms and energy dissipated due to the scratching. Additionally, investigations focused on the stress triaxiality variation as a function of the localized influence of pores and other material heterogeneities, and subsurface results after the scratch tests, can be promoted. To reach this goal, numerical simulations by finite elements (FEM) are utilized to provide explanations in terms of stress and strain fields, closing/deformation of pores, residual stress, and strain-hardening. To conclude, this research intends to make an investigation due to the design of materials and microstructural definitions, which can be helpful in view of biomaterials. Collaborations are taken as very important to broad and complement knowledges related to material, manufacturing processes and mechanical behavior in experimental and numerical approaches. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

BORDINASSI, ED CLAUDIO; MHURCHADHA, SINEAD UI; SERIACOPI, VANESSA; DELIJAICOV, SERGIO; GIAMPIETRI LEBRAO, SUSANA MARRACCINI; THOMAS, KEN; BATALHA, GILMAR FERREIRA; RAGHAVENDRA, RAMESH. Effect of hybrid manufacturing (am-machining) on the residual stress and pitting corrosion resistance of 316L stainless steel. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 44, n. 10, p. 16-pg., 2022-10-01. (20/10653-5, 20/09163-3)

BORDINASSI, ED CLAUDIO; SERIACOPI, VANESSA; DOS SANTOS, MARCELO OTAVIO; PASCHOALINOTO, NELSON WILSON; DE FARIAS, ADALTO. Effect of cryogenic cooling on residual stresses and surface finish of 316L during hybrid manufacturing. INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, v. N/A, p. 14-pg., 2023-10-02. (20/10653-5, 20/09163-3)