Journal ArticleDOI
The metallurgical structure of as-solidified Ni-Cr-B-Si-C hardfacing alloys
TLDR
In this paper, a model of the solute exchanges during solidification is proposed in order to predict the amount of liquid remaining at each stage in the process, particularly at the last stage when all the eutectic liquid is frozen in.Abstract:
The crystallization of complex nickel-base hardfacing alloys is studied with reference to the ternary Ni-Si-B and quaternary Ni-Cr-B-Si systems. Quenched interrupted, directional solidification is employed to establish the solidification sequence. The transformation temperatures are measured by differential thermal analysis. Solid-state transformations occurring during the cooling process are described. A model of the solute exchanges during solidification is proposed in order to predict the amount of liquid remaining at each stage in the process, particularly at the last stage when all the eutectic liquid is frozen in.read more
Citations
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Assessment of wear performance of flame sprayed and fused Ni-based coatings
TL;DR: In this paper, the microstructural development of these coatings before and after fusing treatment is discussed to identify the precipitates in the coatings, and the optimum fusing conditions (time and temperature) for wear-testing sample were investigated in terms of microhardness and porosity of the coating.
Journal ArticleDOI
An experimental study of the erosion-corrosion behavior of plasma transferred arc MMCs
TL;DR: In this paper, the erosion-corrosion behavior of two tungsten carbide (WC)-MMCs with and without a reinforcing hard phase was studied and compared with the NiCrBSi matrix with different concentration of chromium (Cr), carbon (C), and boron (B).
Journal ArticleDOI
Wear and corrosion resistance of PTA weld surfaced Ni and Co based alloy layers
Kim H.-J.,Y.J. Kim +1 more
TL;DR: In this article, microstructural development in the hardfacing alloys NiCrBSi and Stellite 6 resulting from commercially available open arc and spray and fuse coating techniques was compared with that resulting from the plasma transferred arc (PTA) weld surfacing process.
Journal ArticleDOI
Electroless nickel-boron coatings on metal carbides
TL;DR: In this paper, two electrolyte solutions for the deposition of Ni-B coatings were developed: an alkaline and an acidic bath, both based on nickel chloride, which produced continuous firms of uniform thickness on sintered carbide substrates; the acidic bath showed a higher deposition rate.
Journal ArticleDOI
Studies on remelting of tungsten carbide and rare earth modified nickel base alloy composite coating
TL;DR: In this paper, the Ni base alloy powder was modified by adding tungsten carbide (10 and 20 wt-%) and CeO2 to study their effects on the microstructure, microhardness and abrasive wear behaviour of unmodified and modified coatings.
References
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Journal ArticleDOI
Solute redistribution during solidification with rapid solid state diffusion
T.W. Clyne,Wilfried Kurz +1 more
TL;DR: In this paper, a modified version of the Brody and Flemings analysis is presented to describe the solidification behavior of two steels solidifying over a range of cooling rates and the results indicate that such systems will in many cases be quite close to thermodynamic equilibrium with respect to carbon redistribution.
Journal ArticleDOI
The growth of γ′ precipitates in nickel-base superalloys
TL;DR: In this paper, the development of precipitates in a range of nickel-base superalloys is investigated and the morphology is correlated with the size and sign of the γ γ′ misfit, measured using convergent beam electron diffraction.
Measurements of Solute Redistribution in Dendritic Solidification
TL;DR: In this article, a series of experiments are reported which show that reasonable assumptions for analysis of solute redistribution in solidification of castings and ingots include: negligible undertooling before nucleation of solid phases, negligible increase of Solute in advance of the tips of growing dendrites, complete diffusion within the liquid over distances the order of dendrite arm spacings, plate-like dendritic morphology.