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Title: Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
Authors: Cota, André Barros
Oliveira, Fernando Lucas Gonçalves e
Barbosa, Anderson Luiz da Rocha e
Lacerda, Cássio Antônio Mendes
Araújo, Fernando Gabriel da Silva
Keywords: Thermal treatment
Dual-phase steel
Tempered martensite
Issue Date: 2003
Citation: COTA, A. B. et al. Microstructure and mechanical properties of a microalloyed steel after thermal treatments. Materials Research, v. 6, n. 2, p. 117-121, 2003. Disponível em: <>. Acesso em: 13 dez. 2012.
Abstract: The properties of a microalloyed steel, with Nb and V in its composition, were studied, after different intercritical thermal treatments and at different austenitizing and tempering temperatures. The mechanical properties of the specimens were measured in a Vickers hardness tester, and their microstructures were analyzed by optical microscopy, with the aid of a digital image processor. After austenitizing at 1100 °C and tempering at 625 °C, the samples showed significantly higher tempering resistance, reflected by their retention of high hardness, which may be associated with a secondary hardening precipitation of Nb carbon nitrides. In the sample with dualphase microstructure, the martensite volume fraction varied from 18.2 to 26.3% and the ferrite grain size remained unchanged, upon the variation of the time length of the intercritical treatments. Tempered samples showed Vickers hardness (HVN) varying from 327 to 399, and dualphase samples showed HVN from 362 to 429.
ISSN: 15161439
metadata.dc.rights.license: Autorização concedida ao Repositório Institucional da UFOP pelo Periódico Materials Research em 25/10/2013 para depositar uma cópia eletrônica dos artigos publicados por esse periódico em que ao menos um dos autores é aluno ou professor da UFOP.
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