Effect of simultaneous addition of ferroniobium and ferrotitanium on properties of hardfacing

ABSTRACT

The slag-free self-shielded flux-cored wire with simultaneous addition of ferroniobium (Fe-Nb) and ferrotitanium (Fe-Ti) was developed to fabricate the iron-based hardfacing alloys. The transfer coefficients of Nb and titanium of slag-free self-shielded flux-cored wire were 91.2 and 63.8%, respectively. The changes in microstructures indicate that Nb and Ti addition shifted the carbon concentration in the remaining liquid to one corresponding to the near eutectic state owing to the formation of (Nb, Ti)C which consumed carbon. The wear loss of the hardfacing alloy with 18 wt-% Fe-Nb and 6 wt-% Fe-Ti addition was the smallest among all the alloys owing to the formation of reinforced uniform quadrangle-shaped (Nb, Ti)C carbides in the refined microstructure and the highest hardness.

KEYWORDS:

• Simultaneous addition
• Nb and Ti
• iron-based
• hardfacing
• wear resistance

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported in part by the China Postdoctoral Science Foundation Funded Project (Grant No. 2016M601753), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 16KJB460007), the Central Plains Scholar Project of Henan Province (172101510003), the Open Project Program of the State Key Laboratory of Advanced Brazing Filler Metals and Technology (SKLABFMT-2017-03), Jiangsu Government Scholarship for Overseas Studies (Grant No. JS-2016-133) and Funding of National Natural Science Foundation of China (Grant No. 51405208). The authors also thank M.Sc degree candidate Daniel Unsworth for technical writing feedback (Department of Chemical and Materials Engineering, University of Alberta, Canada).