Comparative Analysis of the Phase Interaction in Plasma Surfaced NiBSi Overlays with IVB and VIB Transition Metal Carbides

Abstract

Important applications of transition metal carbides (TMCs) are as wear resistant composite layers deposited by plasma transferred arc welding (PTAW) and laser methods. Growing interest in them has also been observed in additive manufacturing and in HEA technology (bulk composite materials and layers), and in the area of energy conversion and storage. This paper presents the results of comparative studies on interfacial interactions in the NiBSi−TMCs system for two border IVB and VIB TM groups of the periodic table. Model (wettability and spreadability) and application experiments (testing of the PTAW-obtained carbide particle−matrix boundaries) were performed. Fe from partially melted steel substrates is active in the liquid NiBSi−TMCs system. It was revealed that the interaction of TMCs with the liquid NiBSi matrix tends to increase with the group number, and from the top to bottom inside individual groups. Particles of IVB TMCs are decomposed by penetration of the liquid along the grain boundaries, whereas those of VIB are decomposed by solubility in the matrix and secondary crystallization. No transition zones formed at the interfacial boundaries of the matrix−IVB group TMCs, unlike in the case of the VIB group. The experimental results are discussed using the data on the TMC electronic structure and the physicochemical properties.

Influence of Preheating Temperature on Structural and Mechanical Properties of a Laser-Welded MMC Cobalt Based Coating Reinforced by TiC and PCD Particles

“…The size and thickness of the welded material are also important in this case. Elements with larger dimensions, such as toothed cones, should be heated more (even up to 500-700 • C), bearing in mind that too high a preheating temperature can, however, contribute to the thermal decomposition of the carbide phase [42]. The effect of the preheating temperature of the base material before surfacing on the number of cracks in the composite layer is shown in Figure 7.…”

“…At ambient temperature, a metastable regular flat-centered phase is often present in cobalt alloys instead of the hexagonal phase. This phase, defined as cobalt (alloy) austenite, is a solid solution of Cr, Ni, Fe, W, Mo or Mn in cobalt [42].…”

Comparison of Wear Resistance of Overlay Welded Layers and Thermal Sprayed Coatings in Real Conditions

“…Welding technologies enable the application of abrasion-resistant layers and coatings. This resistance depends on the type of additional material used and the surfacing technology [3][4][5]. During the surfacing with arc welding process, dilution occurs, which may cause differences in the structure of the surfacing layer, and thus changes in its abrasion resistance depending on the degree of wear [6].…”

Wear Resistance Comparison Research of High-Alloy Protective Coatings for Power Industry Prepared by Means of CMT Cladding

“…Metallic protective coatings deposited by means of welding/cladding processes are often applied in many industries [3,4], especially on steel tubes and water walls in advanced power generation boilers to improve their performance and extend their lifetime (which mainly depends on what coating material has been used). Various chemical [5], welding, and welding-related processes [6] were employed for surface modification of materials [7,8], cladding [9], and other coating deposition methods [10][11][12]. Common welding methods such as MMA (Manual Metal Arc) deposition [13] provide thick (4-5 mm), good-wear behavior and a relatively low cost of treatment, but they absorb a lot of coating material and produce coatings with high-dimensional instability [14].…”