Enhanced upper shelf energy by ultrafine elongated grain structures in 1100MPa high strength steel

M. Jafari, Y. Kimura, K. Tsuzaki

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Abstract

The ultrafine elongated grain (UFEG) structure with strong <1. 1. 0>//RD fiber deformation texture was produced by warm caliber-rolling at 500°C and final tempering at 550°C, namely tempforming in the 1100. MPa medium carbon-low alloy steel with ultralow phosphorus and sulfur concentrations. Charpy impact tests were performed at temperature range of -196°C to 150°C on the UFEG structure along with a conventional quenched and tempered (QT) structure. A remarkable increase in upper shelf energy of 150. J was obtained in the UFEG structure without delamination, while that of QT structure was 97. J. The UFEG structures tempered at higher temperatures of 625 and 700°C showed remarkable increase in Charpy absorbed energy from 150. J to 187. J and 203. J. Also, the QT structure absorbed almost same energy as UFEG structure at 700°C. The enhanced toughness was discussed with tensile ductility, void nucleation and growth, and their relations to microstructure including the <1. 1. 0>//RD fiber deformation texture.

Original languageEnglish
Pages (from-to)420-429
Number of pages10
JournalMaterials Science and Engineering A
Volume532
DOIs
Publication statusPublished - Jan 15 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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