Manufacturing Methods of Alloy Layers on Casting Surfaces

Abstract

In this paper, we presented the technology of layered castings based on the founding method of layer coating directly in the cast process known as the method of mold cavity preparation by monolithic or granular material of insert. Prepared castings consist of two fundamental parts: the base part and working part (layer). The base part of a layered casting is usually typical foundry material (i.e., pearlitic grey cast iron with flake graphite or ferritic-pearlitic carbon cast steel), whereas the dependence of an insert type (i.e., monolithic or granular) working part (layer) is suitably plated with ferritic and austenitic alloy steels or a layer from a Cr-base alloy. The ratio of thickness between the base and working part is between 8:1 and 10:1. The quality of the layered castings was evaluated on the basis of ultrasonic non-destructive testing, structure, and selected usable property research. According to work out technology, the prepared layered castings can work in conditions that require high heat resistance and/or corrosion resistance from the working surface layer of an element in a medium of industrial water, for example. Moreover, in the case of applying an insert based on Cr-base alloy powder on the working surface layer, it is possible to obtain high hardness and abrasive wear resistance.

Archives of Metallurgy and Materials

“…The need to produce high-quality castings results in an intensive technological development of their production methods, which requires continuous research. These studies are mainly aimed at obtaining castings without internal defects of the high strength properties [1-3] or creating the layered castings that can work in high temperature conditions or be resistant to corrosion [4]. research on real objects is difficult due to the high temperatures occurring there, which is why computer simulations make it possible to improve casting methods [1-2,5 -12].…”

Archives of Foundry Engineering

“…The growing requirements regarding the quality of castings require intensive technological development of foundry methods, which requires various researches. These studies focus mainly on obtaining castings without shrinkage defects with high mechanical properties through appropriate control of their feeding [1][2][3][4] or design of layer castings that are resistant to corrosion or have high heat resistance [5]. Conducting research on real objects is significantly difficult due to the lack of visibility and high temperatures taking place there, which is why only computer simulations make it possible to improve casting methods [6][7][8][9][10][11].…”