Effect of matrix toughness and grain morphology on fracture of steels

ATAPEK Ş. H., GÜMÜŞ S., POLAT Ş.

METAL SCIENCE AND HEAT TREATMENT, vol.54, no.11-12, pp.648-653, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 11-12
  • Publication Date: 2013
  • Doi Number: 10.1007/s11041-013-9565-0
  • Journal Name: METAL SCIENCE AND HEAT TREATMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.648-653
  • Keywords: heat treatment, toughness, secondary phases, grain morphology, fracture, HIGH-STRENGTH, ORIENTATION, SIZE
  • Kocaeli University Affiliated: Yes

Abstract

The microstructure and fracture surfaces of steel X42 (type 09G2S) and of an experimental bainitic steel (0.23% C, 0.18% Mn, 0.04% Ni, 2.35% Co, 1.40% Cr, 0.50% Mo, 0.08% Nb, 0.08%V, 0.02% Ti) are studied after quenching and tempering. The influence of the toughness of the matrix on the fracture behavior of the steels is determined. It is shown that the fracture toughness changes depending on the tempering temperature, and the nucleation and propagation of cracks depends on the presence of secondary phases and on the morphology of the grain structure.