Particle Stimulated Nucleation in Coarse-Grained Ferritic Stainless Steel

Autor(es)

De Siqueira, Rodrigo Pinto ^[1] ; Zschommler Sandim, Hugo Ricardo ^[1] ; Raabe, Dierk ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Engn Mat, Escola Engn Lorena, BR-12600970 Lorena Sp - Brazil

^[2] MPIE, D-40237 Dusseldorf - Germany

• Tipo de documento: Artigo Científico
• Fonte: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE; v. 44A, n. 1, p. 469-478, JAN 2013.
• Citações Web of Science: 16

Resumo

Particle-stimulated nucleation (PSN) is investigated in Nb-containing ferritic stainless steel. Coarse-grained sheets were cold rolled to 80 pct thickness reduction and annealed from 973 K to 998 K (700 degrees C to 725 degrees C) to obtain partially recrystallized microstructures. Electron back-scatter diffraction was performed around coarse niobium carbonitride particles (larger than 1 mu m) within coarse grains (similar to 1 mm), with different host orientations in both deformed and annealed states. In the deformed state, the deformation zones around both spherical and rectangular particles were investigated. The local lattice rotations about the transverse direction necessary to accommodate the particle-matrix strain incompatibility were observed in all grains investigated. After annealing, recrystallization occurs preferentially around coarse particles at the initial stages of recrystallization. Based on a total number of 130 grains nucleated via PSN, we observe both, randomly oriented and minor [111]< 110 > oriented texture components. The results also reveal that PSN in this material is not associated with a specific host orientation. DOI: 10.1007/s11661-012-1408-x (C) The Minerals, Metals \& Materials Society and ASM International 2012 (AU)

• Processo FAPESP: 05/60131-5 - Encruamento e recristalização do aço inoxidável ferrítico AISI 430 estabilizado ao nióbio e com estrutura de grãos colunares
• Beneficiário: Rodrigo Pinto de Siqueira
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto