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Advances in Manufacturing

, Volume 7, Issue 2, pp 221–227 | Cite as

Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys

  • Tao Chen
  • Ye-Xin ChenEmail author
  • Biao Yang
  • Teng Wang
Article
  • 78 Downloads

Abstract

The effects of boron content (CB = 0–0.14% (mass fraction)) on the tensile properties and environmental embrittlement of ordered Ni-24%Fe (atom fraction)-B (Ni3Fe-B) alloys have been investigated using tensile tests in vacuum and under gaseous hydrogen. The results indicate that, when CB < 0.06% (mass fraction), the tensile strength and elongation of the alloys in vacuum and gaseous hydrogen increase as CB in the ordered Ni3Fe-B alloy increases. The tensile strength and elongation are maximum, and the hydrogen embrittlement factor (IH) is minimum for the ordered Ni3Fe-0.06%B (mass fraction) alloy. Compared with the ordered B-free Ni3Fe alloy, IH of the ordered Ni3Fe-0.06%B (mass fraction) alloy decreases by 98.1%, and the fracture morphology of the alloy changes from fully intergranular to fully transgranular, when tested in gaseous hydrogen. A critical level of boron segregation at the grain boundaries of ordered Ni3Fe-B alloys is observed. The hydrogen embrittlement of ordered Ni3Fe-B alloys in gaseous hydrogen can be completely suppressed by boron atoms when CB \(\geqslant\) 0.06% (mass fraction).

Keywords

Ordered Ni3Fe alloy Boron content Environmental embrittlement 

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Copyright information

© Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Materials, School of Materials Science and EngineeringShanghai UniversityShanghaiPeople’s Republic of China
  2. 2.Laboratory for MicrostructuresShanghai UniversityShanghaiPeople’s Republic of China

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