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Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys

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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).

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Authors and Affiliations

  1. Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, People’s Republic of China

    Tao Chen, Ye-Xin Chen, Biao Yang & Teng Wang

  2. Laboratory for Microstructures, Shanghai University, Shanghai, 200444, People’s Republic of China

    Ye-Xin Chen

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  1. Tao Chen
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  2. Ye-Xin Chen
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  3. Biao Yang
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  4. Teng Wang
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Correspondence to Ye-Xin Chen.

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Chen, T., Chen, YX., Yang, B. et al. Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys. Adv. Manuf. 7, 221–227 (2019). https://doi.org/10.1007/s40436-019-00255-4

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  • DOI: https://doi.org/10.1007/s40436-019-00255-4

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