Microstructure and interface characteristics of NiCrBSi thick coating remelted by TIG process

Induction and Electric Arc-Based Remelting of Thermally Sprayed Layers – Overview

“…In addition, the remelting process resulted in the obtainment of the metallic bonding between the thermally sprayed layer and the substrate. Hardness measurements revealed that the remelted layer was characterised by significantly higher hardness (780 HV0.1) than that of the layer not subjected to remelting (580 HV0.1) [38]. The electric arc remelting process also increased abrasive wear resistance.…”

“…The porosity of the non-remelted layer amounted to 5.6%. After remelting, the porosity was reduced to 0.2% [38]. The metallographic analysis of the non-remelted layer revealed the presence of amorphous and polycrystalline structures as well as single crystals.…”

“…One of the applicable remelting technologies is the TIG method [36][37][38]. Publication [36] presents results of tests involving the TIG method-based remelting of the thermally (arc) sprayed layer of FeNiCrAlBRe deposited on the substrate of steel grade AISI 1045.…”

“…The remelting of layers thermally sprayed using the TIG method-generated electric arc was also the subject of tests discussed in publications [37,38]. The authors examined the quality of plasma sprayed layers of the NiCrBSi powder.…”

“…The grains present in the layer were characterised by irregular shapes and various sizes, which could significantly affect the strength of the layer. The fine-grained microstructure of the layer subjected to TIG remelting was primarily composed of dendrites [37,38]. In addition, the remelting process resulted in the obtainment of the metallic bonding between the thermally sprayed layer and the substrate.…”