Modeling of the case depth and surface hardness of steel during ion nitriding

Development of a combined technology for hardening the surface layer of steel 38Cr2MoAl

“…A detailed description of the preliminary laser treatment was given in [17]. As is well known ( [8,12]), the optimal nitriding temperature is 550 °C. Therefore, variation of Table 1 Chemical composition of steels nitriding duration was of particular interest for analysis of the effect of nitriding on thickness of the hardened layer and microhardness of the surface layers.…”

“…As shown in [12], ion-plasma nitriding shortens processing to 2-8 hours. However, this kind of nitriding is associated with the use of special complex equipment.…”

Development of an iron-based alloy with a high degree of shape recovery

“…Quantitative phase analysis for residual austenite in the alloy was carried out using the x-ray machine DRON-3 (Russia) according to the standard procedure [22].…”

Development of mathematical models for planning the duration of shunting operations

“…For example, if assigned by the permissible values of technological time of a semi-flight, one may find the appropriate three input variables (х 1 , х 2 , х 3 ). Geometrically, this means designing the cross-section of response surface by the plane of equal level, which corresponds to the selected value of output variable, on the plane (х 1 , х 2 ), (х 1 , х 3 ), (х 2 , х 3 ) and subsequent construction of nomograms [14]. However, of the largest interest is the study of the response surface to detect local extrema that occur on the boundaries, described by the curves, obtained in the cross-section of response surface by cylinders of the radius r. The latter are the analytical description of limitations in the form of the crests that allow determining the suboptimal values of output variables and the values of input variables corresponding to them [15].…”