Boron effects on the ductility of a nano-cluster-strengthened ferritic steel

Z. W. Zhang, C. T. Liu, S. Guo, J. L. Cheng, G. Chen, Takeshi Fujita, M. W. Chen, Yip Wah Chung, Semyon Vaynman, Morris E. Fine, Bryan A. Chin

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The mechanical properties of Cu-rich nano-cluster-strengthened ferritic steels with and without boron doping were investigated. Tensile tests at room temperature in air showed that the B-doped ferritic steel has similar yield strength but a larger elongation than that without boron doping after extended aging at 500 °C. There are three mechanisms affecting the ductility and fracture of these steels: brittle cleavage fracture, week grain boundaries, and moisture-induced hydrogen embrittlement. Our study reveals that boron strengthens the grain boundary and suppresses the intergranular fracture. Furthermore, the moisture-induced embrittlement can be alleviated by surface coating with vacuum oil.

Original languageEnglish
Pages (from-to)855-859
Number of pages5
JournalMaterials Science and Engineering A
Volume528
Issue number3
DOIs
Publication statusPublished - 2011 Jan 25

Keywords

  • Boron doping
  • Ductility
  • Ferritic steel
  • Moisture-induced embrittlement
  • Nano-cluster

ASJC Scopus subject areas

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

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