Abstract
The paper presents the results of research the new technological process for producing bimetallic materials in the composition of “aluminum cast alloy - sintered iron powder” by the method of joint stamping of liquid metal. The purpose of this research is obtain parts with high wear-resistant properties, special sintered powder materials are used, which have an internal porosity to retain lubricant. However, such materials do not fit well with traditional aluminum alloys. This problem is may be solved by creating new bimetallic alloys, part of which is an outer casing, and the other materials is the functional bearing. To accomplish this task, we conducted a study of a new technology for joint stamping of liquid metal. In order to optimize and increase the reliability of the experiment, the pressing pressure, the pressure holding time, and the tooling temperature of the matrix were taken as quantitative factors. The effect of the applied pressure on the mechanical properties of the base material and the facing layer was determined on a longitudinal section of the obtained samples by the Vickers method. It was revealed that the gradient of increasing hardness is directed to the outer radius of the workpiece, that is, to the opposite crystallization front. The high level of bimetal adhesion is explained by the presence of a uniform moderate zone of mutual solubility, including due to the violation of the porous surface layer of the powder billet.
Highlights
Nowadays, great importance is given to increasing the regulated overhaul life of engines and components in the process of manufacturing engineering or shipbuilding products for civil and other application
The aim of the work was an experimental study of the possibility of obtaining high-quality bimetallic compounds by joint stamping of a liquid aluminum casting alloy AlSi9Mg and a working liner made of sintered porous iron powder material (Fe - base, C - 0.025%, Fe2O3 < 0.2%)
If in the case of the casting technology, this spread does not usually exceed 5%, in the stamping of liquid metal (SLM) process the hardness parameters across the cross section could differ by 10% or more, which can be explained by the accelerated heat transfer at the “liquid metal -forming tool” border
Summary
Great importance is given to increasing the regulated overhaul life of engines and components in the process of manufacturing engineering or shipbuilding products for civil and other application. The basis of such a pair, as a rule, is used relatively cheap construction materials: babbits, antifriction brass, bronze and a number of aluminum alloys are used as the working wear-resistance layer. Industrial methods for producing aluminum-steel billets are solid-phase methods, such as rolling or welding This group of technological processes requires special preparation of materials and initial blanks. It is significantly limited in the geometry of the final product and the range of materials of the cladding layer, in particular, it does not allow fully using the advantages of powder metallurgy and casting technology. To obtain shaped bimetallic blanks from a given pair of materials, it is necessary to develop a fundamentally new production technology that provides a high level of special properties and adhesion strength of layers of materials
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