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Enhancement of Upper Shelf Energy through Delamination Fracture in 0.05 pct P Doped High-Strength Steel

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Abstract

An ultrafine elongated grain (UFEG) structure with strong 〈110〉//rolling direction (RD) fiber deformation texture was produced by warm-caliber rolling at 773 K (500 °C) and final tempering at 823 K (550 °C), namely tempforming in the 1200 MPa-class, medium-carbon, low-alloy steel with phosphorus (P) content of 0.053 wt pct. Charpy impact tests and tensile tests were performed at a temperature range of 77 K (–196 °C) to 623 K (350 °C) on the tempformed (TF) samples along with a conventional quenched and tempered (QT) samples. The QT structure showed a low upper shelf energy of 70 J and a high ductile-to-brittle transition temperature (DBTT) of 373 K (100 °C) as a result of P segregation and intergranular fracture. A remarkable increase in the upper shelf energy to 150 J from 70 J and a low DBTT of approximately 103 K (–170 °C) were obtained in the UFEG structure. P segregation embrittlement disappeared completely in the UFEG structure, and ductile fracture on the planes normal to RD along with delamination fracture on the planes along RD were observed at a temperature range of 123 K (–150 °C) to 423 K (150 °C). The enhanced delamination occurred because of the microstructural anisotropy of the UFEG structure, a strong 〈110〉//RD fiber deformation texture, and interfaces (i.e. ferrite grain boundaries and cementite particles-ferrite matrix interfaces) weakened by P segregation as feasible crack propagation paths. We studied the delamination (crack-arrester-type) fracture in 0.053 pct P doped high-strength steel along with upper shelf energy and DBTT obtained from the UFEG structure.

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Authors and Affiliations

  1. The Research Center for Strategic Materials, Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

    Meysam Jafari (Doctor of Engineering and Junior Researcher), Yuuji Kimura (Doctor of Engineering and Senior Researcher) & Kaneaki Tsuzaki (Doctor of Engineering, Professor, and Managing Director)

Authors
  1. Meysam Jafari
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  2. Yuuji Kimura
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  3. Kaneaki Tsuzaki
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Correspondence to Meysam Jafari.

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Manuscript submitted July 29, 2011.

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Jafari, M., Kimura, Y. & Tsuzaki, K. Enhancement of Upper Shelf Energy through Delamination Fracture in 0.05 pct P Doped High-Strength Steel. Metall Mater Trans A 43, 2453–2465 (2012). https://doi.org/10.1007/s11661-012-1095-7

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