Shiyan A. Scientific basis for the formation of a rational complex of mechanical properties of structural steels and titanium alloys

Subject of inquiry is the complex mechanical properties of structural alloys based on iron and titanium and uniaxial stretching steps nonuniform force fields in a wide range of load and external temperature, submitted for analysis accessible existing data bank formed from the literature and from our own research. Research methods: a uniaxial tensile test, and samples of smooth cylindrical samples with stress concentrators within a temperature range from 293 K to 77 K; Mathematical Statistics and Modelling; optical, electronic transmission and scanning microscopy, X-ray phase analysis. Theoretical and practical results: developed method of settlement prediction performance RX brittle strength and mechanical stability Kms can be used in the majority of the factory and research laboratories, as it is based on shared basic mechanical characteristics; proposed quantitative mechanical and structural quality of the metal may be of practical value to the planning, development and adjustment of process steps in order to create structural alloys with specified mechanical properties; developed a new model of the flow chart can be useful to select, order, or create an alloy with a given key feature of the system interconnection "plasticity - strength - mechanical stability". Novelty of the research: first investigated the relationship physically sound system properties "plasticity - strength - mechanical stability" of structural steels and titanium alloys; for the first time it found that by the nature of changes in the mechanical properties due to their existence of coherence with one another, all metallic alloys investigated are divided into two kinds of behavior of mechanical characteristics; It developed a concept of physical and mechanical fracture resistance phenomenological description of iron-based alloys, and titanium in a limiting condition parameters defined by the characteristics of strength, ductility and embrittlement. Implementation extent: method for predicting the characteristics of brittle strength Kms RX and mechanical stability of structural steel was tested and implemented in SHEI PSABandA, PJSC "MMC named after Ilyich" and PJSC "MC "Azovstal". Range of application: aviation and space technology, metallurgy, building.