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
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
.
DOI: 10.1007/s40436-019-00255-4
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