Effect of Cr₃C₂ content on microstructure and properties of 310 stainless steel coating by PTA welding

Abstract

In this work, the effect of Cr 3 C 2 on the microstructure and properties of 310 coatings by plasma transfer arc welding was studied. The microstructure, composition, hardness and wear resistance of the coatings were analyzed by scanning electron microscope, EDS, X-ray diffractometer, microhardness tester and friction wear tester. The results show that when Cr 3 C 2 is less, the coating is composed of columnar crystal and cellular crystal, mainly including (Fe, Ni) Fe 3 Ni 2 FeCr 0.29 Ni 0.16 C 0.06 Cr 2 Fe 14 C and CrFe 7 C 0.45 . With the increase of Cr 3 C 2 , the structure becomes dendrites and new phases Cr 7 C 3 and Cr 23 C 6 appeared. However, the crystallinity of 5% is poor and there is no obvious grain structure. The hardness of the coatings increases first and then decreases with the content of Cr 3 C 2 . The hardness with the content of 3% is the highest. The friction coefficient corresponds to the hardness and the main wear mechanism is abrasive wear and oxidation wear.

Characterization and wear properties of plasma sprayed Cr3C2 and Stellite coatings on Inconel 625

“…SEM analysis were performed on the damaged coating surface to study the wear mechanism. show the chemical composition of Cr 3 C 2 and Stellite respectively [26]. Inconel 625 procured from Coimbatore Metal Mart, India has been selected as the substrate material.…”

Wear properties of self-lubricating CrxSy/Ni coatings on 304 stainless steel by pre-placed laser cladding

“…However, because of the low hardness and poor abrasion resistance, SUS 304 is likely to be scratched and worn, which severely restricts the life of mechanical equipment. Surface modification and repairing technologies, such as additive manufacturing, PTA welding, laser cladding, and so on, could be adopted to deposit high-performance wear-resistant coating and to restore the failure parts and prolong life-span, providing an efficient method to enhance the wear resistance of mechanical parts [4,5]. Pre-placed powder laser cladding is not only easy to operate, but also has the advantage of low powder fluidity [6].…”

Produção e caracterização de camadas MMC resistentes ao desgaste em ferros fundidos nodulares pela técnica >i<TIG surface alloying>/i< in-situ

“…Tal situação ocorre, pois além dos processos termodinâmicos, as reações de formação dos carbonetos são governadas por fatores cinéticos, uma vez que menores taxas de resfriamento permitem que elementos de liga segreguem entre os diferentes constituintes [123].…”