TiC-NbC协同强化铁基合金耐磨涂层的微观组织与力学性能研究综述OA

Under extreme operating conditions such as high temperature,heavy load,and high-speed friction,applying advanced surface engineering technologies to fabricate iron-based wear-resistant coat-ings on steel substrates is an effective approach to extend the service life of critical components and pro-mote resource recycling.In conventional Fe-Cr-C alloys,coarse primary M7C3-type carbides often form;these brittle phases can readily become crack initiation sites under severe service conditions,comprom-ising the coating's durability.The addition of Nb can lead to the precipitation of fine NbC particles at grain boundaries,thereby suppressing crack initiation and reducing the propensity for cracking.However,excessive Nb addition may cause NbC to agglomerate and form coarse particles,which is det-rimental to coating performance.Further introduction of Ti enables in-situ reactions with C to form stable and high-hardness TiC,which can act as heterogeneous nucleation sites for NbC,thus refining and homogenizing the microstructure and effectively enhancing the overall properties of the coating.This review summarizes the nucleation mechanisms involving the synergistic effect of in-situ formed TiC and NbC,and discusses the influence of Nb and Ti additions on the microstructure and mechanical properties of Fe-Cr-C-based alloy coatings,providing theoretical support for the applied research of high-performance wear-resistant iron-based alloy coatings.