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Abstract
Modeling of the ion nitriding process allows solving many problems of operations management, forecasting of results and development of new treatment regimes, which is an urgent issue today. The goal of the paper was modeling of the case depth and surface hardness of 38Cr2MoAl А steel during ion nitriding. The experimental data showed that the case depth varies from 20 to 620 µm in the ion nitriding temperature range of 500-560 °С and duration of 1-12 hours, with the surface hardness varying from 8 to 12 GPa. The mathematical models in the form of quadratic polynomials, describing the dependence of the nitrided case depth and surface hardness on the temperature and duration of thermochemical treatment were obtained. The graph-analytical description of variations in the nitrided case depth and surface hardness depending on variations in temperature and duration of treatment, which allows determining the specific conditions of ion nitriding 38Cr2MoAl steel is constructed.
Highlights
IntroductionNitriding is the most common and effective method of surface hardening
Nitriding is the most common and effective method of surface hardening. Such thermochemical treatment can improve the surface hardness, contact endurance, abrasion and adhesion resistance, as well as heat resistance and corrosion resistance of a wide range of machine parts. This process of surface hardening has found its application in many fields of modern mechanical engineering
Operational requirements for parts produced a need to replace the high-temperature methods of thermochemical treatment with the processes of hardening at lower temperatures (500-650 °С), namely nitriding. This replacement is due to the latest technological developments in the field of various nitriding methods Modern scientific developments allow to gradually eliminate disadvantages of nitriding such as considerable duration, high fragility of the case, insufficient contact endurance values, complexity of the process [1]
Summary
Nitriding is the most common and effective method of surface hardening Such thermochemical treatment can improve the surface hardness, contact endurance, abrasion and adhesion resistance, as well as heat resistance and corrosion resistance of a wide range of machine parts. This process of surface hardening has found its application in many fields of modern mechanical engineering. Operational requirements for parts produced a need to replace the high-temperature methods of thermochemical treatment (carburizing, high-temperature nitrocarburizing, etc.) with the processes of hardening at lower temperatures (500-650 °С), namely nitriding This replacement is due to the latest technological developments in the field of various nitriding methods Modern scientific developments allow to gradually eliminate disadvantages of nitriding such as considerable duration, high fragility of the case, insufficient contact endurance values, complexity of the process [1]. Forecasting and modeling of processes of formation of structure and properties in the case during nitriding is an urgent task
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