Conde, F. F.
Escobar, J. D.
Oliveira, J. P.
Jardini, A. L.
Bose Filho, W. W.
Avila, J. A.
Total Authors: 6
 Univ Sao Paulo, Dept Mat Engn, Av Joao Dagnone, 1100 Jd Sta Angelina, BR-13563120 Sao Carlos, SP - Brazil
 Univ Sao Paulo, Met & Mat Engn Dept, 10 Av Prof Mello Moraes 2463, BR-05508030 Sao Paulo, SP - Brazil
 NOVA Univ Lisbon, NOVA Sch Sci & Technol, Dept Mech & Ind Engn, UNIDEMI, P-2829516 Caparica - Portugal
 Univ Estadual Campinas, Fac Chem Engn, Natl Inst Biofabricat BIOFABRIS, Av Albert Einstein 500, BR-13083852 Campinas, SP - Brazil
 Sao Paulo State Univ, UNESP, Campus Sao Joao da Boa Vista 505, Av Profa Isette, BR-13876750 Sao Joao Da Boa Vista, SP - Brazil
Total Affiliations: 5
Web of Science Citations:
Reverted austenite is a metastable phase that can be used in maraging steels to increase ductility via transformation-induced plasticity or TRIP effect. In the present study, 18Ni maraging steel samples were built by selective laser melting, homogenized at 820 degrees C and then subjected to different isothermal tempering cycles aiming for martensite-to-austenite reversion. Thermodynamic simulations were used to estimate the inter-critical austenite + ferrite field and to interpret the results obtained after tempering. In-situ synchrotron X-ray diffraction was performed during the heating, soaking and cooling of the samples to characterize the martensite-to-austenite reversion kinetics and the reverted austenite stability upon cooling to room temperature. The reverted austenite size and distribution were measured by Electron Backscattered Diffraction. Results showed that the selected soaking temperatures of 610 degrees C and 650 degrees C promoted significant and gradual martensite-to-austenite reversion with high thermal stability. Tempering at 690 degrees C caused massive and complete austenitization, resulting in low austenite stability upon cooling due to compositional homogenization. (AU)