Effect of Processing Conditions on the Microstructure, Mechanical Properties, and Corrosion Behavior of Two Austenitic Stainless Steels for Bioimplant Applications

Autor(es)

Silva, Mariana-Beatriz R. ^[1] ; Roche, Virgine ^[2] ; Blanco, Telma M. ^[2] ; Viet, Nguyen Hoang ^[3] ; Balancin, Oscar ^[1] ; Cabrera, Jose-Maria ^{[4, 5]} ; Jorge, Jr., Alberto Moreira ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Mat Engn, Via Washington Luis, Km 235, BR-13565905 Sao Paulo - Brazil

^[2] Univ Grenoble Alpes, Univ Savoie Mont Blanc, CNRS, Grenoble INP, LEPMI, F-38000 Grenoble - France

^[3] Hanoi Univ Sci & Technol, Sch Mat Sci & Engn, Hanoi 100000 - Vietnam

^[4] Univ Politecn Catalunya UPC, Dept Mat Sci & Engn, Eduard Maristany 10-14, Barcelona 08019 - Spain

^[5] Univ Michoacana San Nicolas Hidalgo UMSNH, Inst Res Met & Mat, Ave Francisco Mugica S-N, Morelia 58230, Michoacan - Mexico

• Tipo de documento: Artigo Científico
• Fonte: METALS; v. 10, n. 10 OCT 2020.
• Citações Web of Science: 0

Resumo

Hot torsion tests were carried out to simulate the industrial thermomechanical processing of two austenitic steels for bioimplant applications, namely ISO 5832-9 and ASTM F138. The former has Ti, Nb, and V in the composition, being N-rich. However, the latter is Ni-richer and without extra alloying element additions. Special attention was paid to the effect of interpass times, particularly to the soaking temperature, which was reduced to decrease processing times and costs. Optical and electron microscopy, corrosion tests, and hardness measurements were used to characterize the effect of the above processing parameters on both alloys. No significant increase in processing loads was noticed after the reduction of the reheating temperature. This was explained in terms of the balance between partial particles dissolution and the increment in the solute drag effect provided by the elements put into solution. Such an increment in solid solution favored the dynamic recovery process, delaying the dynamic recrystallization one. However, strain-induced precipitation took place at lower temperatures, by using the extra N and Cr delivered to the matrix, and limiting the recrystallization softening. The rolling schedule promoted abundant grain refinement. The final grain size ranged from 2.5 to 11 mu m, depending on reheating temperature, interpass time, presence of alloying elements, and N. In general terms, the corrosion resistance of the ISO steel soaked at the lowest temperature (1200 degrees C) was better than when reheated to the highest one (1250 degrees C). On the contrary, the F138 steel had worse corrosion behavior. (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