Evaluation of microstructure anisotropy on room and medium temperature ECAP deformed F138 steel

Autor(es)

De Vincentis, N. S. ^[1] ; Kliauga, A. ^[2] ; Ferrante, M. ^[2] ; Avalos, M. ^[1] ; Brokmeier, H. -G. ^[3] ; Bolmaro, R. E. ^[1]

Afiliação do(s) autor(es)

^[1] FCEIA UNR CONICET, Inst Fis Rosario, Rosario, Santa Fe - Argentina

^[2] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil

^[3] Tech Univ Clausthal, Inst Werkstoffkunde & Werkstofftech, D-22607 Hamburg - Germany

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS CHARACTERIZATION; v. 107, p. 98-111, SEP 2015.
• Citações Web of Science: 10

Resumo

The microstructure developed during severe plastic deformation results in improved mechanical properties because of the decrease in domain sizes and accumulation of defects, mainly dislocation arrays. The characteristic deformation stages observed in low stacking fault energy (SFE) face centered cubic (FCC) materials are highly influenced by the development of the primary and secondary twinning that compete with dislocation glide. In this paper, a low SFE F138 stainless steel is deformed by equal channel angular pressing (ECAP) up to 4 passes at room temperature (RT) and at 300 degrees C to compare the grain refinement and twin boundary development with increasing deformation. Tensile tests were performed to determine the deformation stages reached by the material before and after ECAP deformation, and the resulting microstructure was observed by TEM. X-ray diffraction and EBSD, average technique the first and local the second one, were used to quantify the microstructural changes, allowing the determination of diffraction domain sizes, dislocation and stacking fault densities and misorientation indices, which lead to a complete analysis of the deformation introduced in the material, with comparative correlations between various microstructural parameters. (C) 2015 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 11/02009-0 - Estudo da textura e das propriedades de mecânicas de ligas metálicas deformadas por cisalhamento: extrusão em canal angular e laminação assimétrica
• Beneficiário: Andrea Madeira Kliauga
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores