Thermomechanical controlled processing to achieve very fine grains in the ISO 5832-9 austenitic stainless steel biomaterial
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 °C and subjected to d...
| Autores: | , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/104131 |
| Acesso em linha: | https://hdl.handle.net/2117/104131 https://dx.doi.org/10.1016/j.matchar.2017.02.026 |
| Access Level: | acceso abierto |
| Palavra-chave: | Niobium Recrystallization (Metallurgy) Stainless steel Thermomechanical controlled processing Strain-induced precipitation Recrystallization Grain refinement Recristal·lització (Metal·lúrgia) Acer inoxidable Acer inoxidable -- Aplicacions industrials Àrees temàtiques de la UPC::Enginyeria dels materials |
| 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 °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. |
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