Ni–Cr–Si–B alloy coatings deposited on AISI 304L stainless steel substrate using plasma transferred arc welding process were studied with respect to the microchemical and microstructural modifications that take place during the process. The coating was characterized for (1) interface integrity and dilution (2) type, morphology and distribution of secondary phases in the coating (3) elemental redistribution between substrate and coating and (4) different phases that form during the deposition process. Formation of a transition zone of only 760 μm width was understood in terms of interdiffusion of Fe and Ni across the interface. Preferential redistribution of carbon to the surface of the coating was observed. It was explained on the basis of difference in thermodynamic activity. Apart from γ-Ni solid solution, the other primary phases identified in Ni–Cr–Si–B alloy were Cr2B, Cr7C3 and Cr3C2. The observed changes in microstructure, microchemistry and hardness have been understood based on the phase transitions of the Ni rich alloy during solidification and cooling on the substrate.

Microchemical and microstructural studies in a PTA weld overlay of Ni–Cr–Si–B alloy on AISI 304L stainless steel

Diffusion kinetics of borided AISI 52100 and AISI 440C steels

A comparison of borides formed on AISI 1040 and AISI P20 steels

Characterization of AISI 4140 borided steels

Plasma paste boronizing of AISI 8620, 52100 and 440C steels

Evaluation of borides formed on AISI P20 steel

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A comparison of borides formed on AISI 1040 and AISI P20 steels

Evaluation of borides formed on AISI P20 steel