NEW METHODOLOGY OF STRUCTURAL ES-TIMATION AND STUDY: LOCAL INHOMOGENEITY SIMULATION
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 80, Issue
Abstract
A support of the reliable operation and an increase of the operational durability of iron-carbon alloys products and parts operating under wear and large impact and thermocyclic loads, are determined by the degree of metal degradation with the development of phase heterogeneity and damage. Study of the structural heterogeneity happening due to these phenomena, development of new methods and im-provement of the accuracy of analysis techniques of the existing ones are among the most important tasks in the search for ways of improvement the operational stability of such products and the reliability prediction. The Goal of our study consists in development and improvement of the new methods for material studies that allow one to both model the changes of structural components' local heterogeneity resulting from the a variety of external influences and to significantly reduce the number of factors in correlation dependencies in order to simplify the calculations without the assessment quality loss. Methodology involves an estimate of the local in-homogeneity of different phases, the variation de-gree in the dislocation structure of high-carbon al-loys is studied. Its distribution density is evaluated under the conditions of stresses generated as a result of heat treatment. Images of microstructures are studied using the methods of our optical-mathematical computer analysis developed and described in a number of our previous papers. Results our research dedicated to modeling of the local heterogeneity of structural components as a result of various external influences, allows us to offer a new complex method for study of metallographic images with the optical-mathematical analysis used and including the new estimation parameters: M-triples and their invariants. Originality. The proposed methodology makes possible the further development of the researches that include modeling on the whole range of rotations. This makes it possible to establish the closest interconnections between them and all the parameters that make up the M triples. Further, this enables to estimate both the structural components heterogeneity and to reveal the various structural components of heterogeneous alloys. It is established that there is a functional connection between three rotational angles which corresponds to each triplet. Practical value the proposed methodical approach allow to evaluate the materials properties, primarily, material hardness.
Authors and Affiliations
O. Klochko
Keywords
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