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Residual stress and surface microhardness post-milling in 2205 duplex steel

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Abstract

The improvement of mechanical strength and corrosion in duplex stainless steels can be maximized when the fractions between phases (α) and (γ) are balanced. Machining operations may compromise surface integrity through microstructural deformations. In this study, surface milling of a 2205 duplex steel was performed under Vc conditions between 298 and 651 m/min and fz between 0.04 and 0.18 mm/tooth. The microstructural evolution characteristics, mechanical properties and residual stresses were investigated by optical microscopy, SEM, MFM, XRD and Vickers microhardness. After milling, microstructure was found to be deformed by shearing of the cutting tool, and the volume fraction of austenite and ferrite was altered, as determined by Rietveld refinements because of the transformation of austenite into martensite (α') induced by plastic deformation. The samples also exhibited variations in phase-specific microhardness, associated with strain-induced martensite formation and the presence of tensile residual stresses.

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. The authors acknowledge the Microscopy Center of the UFMG for assistance in electron microscopy analyses and Centro Nacional de Pesquisa em Energia e Materiais (CNPEM) for the work on MFM and residual stress.

Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001

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Authors and Affiliations

  1. Department of Mechanical Engineering, Pontifícia Universidade Católica de Minas Gerais – PUC Minas, Avenida Dom José Gaspar, 500 – Campus Coração Eucarístico – cep, Belo Horizonte, MG, 30545-901, Brazil

    Carlos Eduardo dos Santos, José Rubens Gonçalves Carneiro, Gilmar Cordeiro da Silva, Pedro Paiva Brito, Ítalo Bruno dos Santos & Thais Roberta Campos

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  1. Carlos Eduardo dos Santos
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  2. José Rubens Gonçalves Carneiro
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  3. Gilmar Cordeiro da Silva
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  6. Thais Roberta Campos
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Contributions

Carlos Eduardo dos Santos: conceptualization, experiments, writing; José Rubens Gonçalves Carneiro: conceptualization and project supervision; Gilmar Cordeiro da Silva: project supervision; Pedro Paiva Brito: data analysis, writing; Thais Roberta Campos: experiments; Ítalo Bruno dos Santos: experiments

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Correspondence to Carlos Eduardo dos Santos or Pedro Paiva Brito.

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dos Santos, C.E., Carneiro, J.R.G., da Silva, G.C. et al. Residual stress and surface microhardness post-milling in 2205 duplex steel. Int J Adv Manuf Technol 113, 3445–3455 (2021). https://doi.org/10.1007/s00170-021-06829-6

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