Abstract
The object of research is the dependence of mechanical properties (yield strength and ultimate strength) on the beryllium-based DSCM on the parameters of their operation (temperature regime) and BeO content in the composition of the material. Such dependence can be established on the basis of technological audit of the process, which has the ultimate aim of constructing an analytical description based on the results of production experimental data, for example, in the form of regression equations. Ridge analysis is chosen for the research. This method allows analyzing the received response surfaces and determining not only the tendency of the dependences of the material properties on the operation parameters and the characteristics of the material itself, but also to more accurately estimate the optimum values. The latter is particularly advantageous from the point of view of optimizing the operation parameters of structures made from these materials, and also from the point of view of the process of their subsequent disposal. Based on the ridge analysis, the values of the input variables (temperature and BeO content) are chosen, which allow obtaining optimal values of the ultimate strength and yield strength. This makes it possible to obtain sets of values of these factors that can be used in the manufacture, operation and disposal of beryllium-based DSCM. Thus, it is found that the optimum values of the yield strength, corresponding to a range of values from 130 to 200MPa, are achieved at t=456 °C and BeO content of 1.35 %, as well as t=528 °C and BeO content of 1.08 %. The optimum values of the ultimate strength, corresponding to a range of values from 180 to 250 MPa are achieved at t=384 °C and BeO content of 1.35 %, as well as t=326 °C and BeO content of 1.845 %. The obtained results allow to select the optimal performance characteristics of the beryllium-based DSCM, which will ensure its maximum efficiency and at the same time reduce the operating costs, which is economically advantageous.
Highlights
Any modern structure includes parts that combine various materials and metal alloys
The aim of research is determination the suboptimal values of technological regimes ensuring the optimal values of the yield strength and ultimate strength of a berylliumbased composite alloy, taking into account the limitations imposed on the technological process
Ridge analysis of the response surfaces describing the effect of temperature and BeO content in composite materials on the yield strength and ultimate strength of the dispersion-strengthened composite materials (DSCM) allows to select the values of the input variables, which allow obtaining optimal values of the ultimate strength and yield stress
Summary
Any modern structure includes parts that combine various materials and metal alloys Owing to this combination, it is often possible to increase the reliability of the structure as a whole and to optimize the performance parameters of its component nodes. The use of beryllium carbide Be2C as a strengthening phase makes it possible to increase the 100-hr beryllium strength at 650 °C 3 times, and at 730 °C is more than 5 times. By this time, the task of determining the berylliumbased DSCM parameters and modeling their properties for quality management during the creation, operation and disposal was not fully reflected in the studies. This, in turn, will optimize the composition of these materials in terms of both operation and subsequent disposal
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