Thermomechanical controlled processing to achieve very fine grains in the ISO 5832-9 austenitic stainless steel biomaterial

Autor(es)

dos Reis Silva, Mariana Beatriz ; Maria Cabrera, Jose ; Balancin, Oscar ; Jorge, Jr., Alberto Moreira

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS CHARACTERIZATION; v. 127, p. 153-160, MAY 2017.
• Citações Web of Science: 2

Resumo

Simulations of thermomechanical processing of a high niobium- and nitrogen-bearing austenitic stainless steel for orthopedic implants (ISO 5832-9) were conducted using hot torsion test with multiple deformations under continuous cooling conditions. Samples were reheated to 1250 degrees C and subjected to deformation schedules with pass strain of 0.3, strain rate of 1 s(-1) and interpass times of 5, 20 and 50 s. Optical microscopy, TEM, EDS and EBSD were used to characterize the samples. Characterization of precipitates indicated that only TiNbN was undissolved after soaking, while Z-phase and NbN precipitated during on cooling deformation schedules. The evolution of grain and precipitate sizes with deformation conditions were studied and related to both grain refinement, and mechanical behavior observed. The critical grain size limited by precipitates was calculated using the values obtained for size and volume fraction of precipitates. Differences observed between calculated and measured values were discussed. (C) 2017 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 09/10919-6 - Evolução microestrutural durante o forjamento a Quente do Aço Inoxidável ISO 5832-9 Utilizado em Implantes Ortopédicos - Uma Abordagem Tecnológica.
• Beneficiário: Alberto Moreira Jorge Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular