Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys

doi:10.1007/s40436-019-00255-4

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 Chen^1,2, Biao Yang¹, Teng Wang¹

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

Abstract

Abstract: The effects of boron content (C_B=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 C_B< 0.06% (mass fraction), the tensile strength and elongation of the alloys in vacuum and gaseous hydrogen increase as C_B in the ordered Ni₃Fe-B alloy increases. The tensile strength and elongation are maximum, and the hydrogen embrittlement factor (I_H) is minimum for the ordered Ni₃Fe-0.06%B (mass fraction) alloy. Compared with the ordered B-free Ni₃Fe alloy, I_H 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 C_B ≥ 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

Tao Chen, Ye-Xin Chen, Biao Yang, Teng Wang. Effects of boron content on environmental embrittlement of ordered Ni₃Fe alloys[J]. Advances in Manufacturing, 2019, 7(2): 221-227.

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Effects of boron content on environmental embrittlement of ordered Ni₃Fe alloys

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