title: Analytical modeling of the thermomechanical behavior of ASTM F-1586 high nitrogen austenitic stainless steel used as a biomaterial under multipass deformation.
abstract: Precipitation-recrystallization interactions in ASTM F-1586 austenitic stainless steel were studied by means of hot torsion tests with multipass deformation under continuous cooling, simulating an industrial laminating process. Samples were deformed at 0.2 and 0.3 at a strain rate of 1.0s(-1), in a temperature range of 900 to 1200°C and interpass times varying from 5 to 80s. The tests indicate that the stress level depends on deformation temperature and the slope of the equivalent mean stress (EMS) vs. 1/T presents two distinct behaviors, with a transition at around 1100°C, the non-recrystallization temperature (Tnr). Below the Tnr, strain-induced precipitation of Z-phase (NbCrN) occurs in short interpass times (tpass<30s), inhibiting recrystallization and promoting stepwise stress build-up with strong recovery, which is responsible for increasing the Tnr. At interpass times longer than 30s, the coalescence and dissolution of precipitates promote a decrease in the Tnr and favor the formation of recrystallized grains. Based on this evidence, the physical simulation of controlled processing allows for a domain refined grain with better mechanical properties.
authors.affiliation: Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil.
authors.forename: Fabiano R
authors.initials: FR
authors.lastname: Bernardes
authors.affiliation: Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil. Electronic address: samuel.filgueiras@ifma.edu.br.
authors.forename: Samuel F
authors.initials: SF
authors.lastname: Rodrigues
authors.affiliation: Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil.
authors.forename: Eden S
authors.initials: ES
authors.lastname: Silva
authors.affiliation: Department of Mechanic and Materials, Federal Institute of Education, Science and Technology of Maranhão - IFMA, Av. Getúlio Vargas, 4, Monte Castelo, CEP 65030-005 São Luís, MA, Brazil.
authors.forename: Gedeon S
authors.initials: GS
authors.lastname: Reis
authors.affiliation: Department of Materials Engineering, Federal University of São Carlos - UFSCar, Rod. Washington Luiz, Km 235, CEP 13565-905 São Carlos, SP, Brazil.
authors.forename: Mariana B R
authors.initials: MB
authors.lastname: Silva
authors.affiliation: Department of Materials Engineering, Federal University of São Carlos - UFSCar, Rod. Washington Luiz, Km 235, CEP 13565-905 São Carlos, SP, Brazil.
authors.forename: Alberto M J
authors.initials: AM
authors.lastname: Junior
authors.affiliation: Department of Materials Engineering, Federal University of São Carlos - UFSCar, Rod. Washington Luiz, Km 235, CEP 13565-905 São Carlos, SP, Brazil.
authors.forename: Oscar
authors.initials: O
authors.lastname: Balancin
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D019245:Compressive Strength; D003198:Computer Simulation; D055119:Elastic Modulus; D006244:Hardness; D008956:Models, Chemical; D009584:Nitrogen / Q000737:chemistry*; D044367:Phase Transition; D013193:Stainless Steel / Q000737:chemistry*; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength
chemical_list: D001672:Biocompatible Materials; C426023:austenitic steel; D013193:Stainless Steel; D009584:Nitrogen
keywords: Biomaterial; Precipitates; Recrystallization; Z-phase