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Advances in Manufacturing ›› 2019, Vol. 7 ›› Issue (2): 221-227.doi: 10.1007/s40436-019-00255-4

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Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys

Tao Chen1, Ye-Xin Chen1,2, Biao Yang1, Teng Wang1   

  1. 1 Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, People's Republic of China;
    2 Laboratory for Microstructures, Shanghai University, Shanghai 200444, People's Republic of China
  • 收稿日期:2018-07-25 修回日期:2019-04-12 出版日期:2019-06-25 发布日期:2019-06-19
  • 通讯作者: Ye-Xin Chen E-mail:yxchen@shu.edu.cn

Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys

Tao Chen1, Ye-Xin Chen1,2, Biao Yang1, Teng Wang1   

  1. 1 Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, People's Republic of China;
    2 Laboratory for Microstructures, Shanghai University, Shanghai 200444, People's Republic of China
  • Received:2018-07-25 Revised:2019-04-12 Online:2019-06-25 Published:2019-06-19
  • Contact: Ye-Xin Chen E-mail:yxchen@shu.edu.cn

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摘要： 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 Ni3FeB alloys in gaseous hydrogen can be completely suppressed by boron atoms when CB ≥ 0.06% (mass fraction).

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-019-00255-4

关键词: Ordered Ni3Fe alloy, Boron content, Environmental embrittlement

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 Ni3FeB alloys in gaseous hydrogen can be completely suppressed by boron atoms when CB ≥ 0.06% (mass fraction).

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-019-00255-4

Key words: Ordered Ni3Fe alloy, Boron content, Environmental embrittlement

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