Metal Science and Heat Treatment

Gol'dshtein, M.

doi: 10.1007/BF01156567pmid: N/A

Farber, V.

doi: 10.1007/BF01156568pmid: N/A

A model of the structure of clusters (Guinier - Preston zones) with a high concentration of excess vacancies and a mechanism of the transformation of the clusters into nuclei of the segregating phase are suggested. The problems of layered growth and thermodynamic description of the zonal stage of decomposition and the concept of the segregation nucleus of a new phase are considered.

Filippov, M.

doi: 10.1007/BF01156569pmid: N/A

Important regular features of the structure and special features of the behavior of metastable manganese austenite under conditions of quasistatic deformation and dynamic contact loading are considered. Based on the correlation of the energy of packing defects of manganese austenite with the kinetics of deformation martensitic transformations {γ → ε → α′, γ → α} and the capacity for deformation strengthening and relaxation of stresses, principles for choosing the base composition of metastable austenitic steels with a high operating stability for different conditions of dynamic contact loading are established.

Litvinov, V.

doi: 10.1007/BF01156570pmid: N/A

Investigations of the phase and structural transformations in manganese and chromium-manganese steels and alloys and their properties were initiated by I. N. Bogachev and co-workers in the 1960s, The phase stability of the alloys, just like their most important properties, is determined by their electron structure. However, at present it is impossible to analyze this problem within a strict theory. An approach based on an investigation of the interatomic interaction in the lattices of tile alloys and the redistribution of atoms caused by it seems to have better prospects. The article presents results on the phase and structural stability of alloys and steels of the system Fe - Mn obtained using physical methods, primarily, nuclear gamma-resonance spectroscopy (NGRS).

Popov, A.

doi: 10.1007/BF01156571pmid: N/A

The variety of phase and structural transformations occurring in two-phase (α + β) titanium alloys in heat and deformation treatments yield articles with different combinations of mechanical properties. However, specific heat treatment regimes are often prescribed on the basis of empirical regularities based on practical experience rather than on data of a comprehensive analysis of phase and structural transformations. As a result, to apply the prescribed regimes of treatment to new alloys a great number of tests have to be conducted, which is laborious and material-consuming. This work is an attempt to substantiate scientifically the principles for prescribing heat treatment regimes proceeding from the regularities of the processes of decomposition of metastable phases in high-alloyed titanium alloys.

Emel'yanol, A.

doi: 10.1007/BF01156572pmid: N/A

Microstructural analysis of the deformability of steels and alloys has been insufficiently well investigated despite the to that a specified plasticity often cannot be achieved without providing the requisite stress state. The article presents data on a structural analysis of the deformability of steels of different classes that has been conducted by the Department of Heat Treatment and Metal Physics in cooperation with the Department of Pressure Treatment of Metals at the Urals State Engineering University. The article is devoted to microstructural aspects of the deformability of structural steels. It is shown that the diagram of the stress state should be taken into account in analyzing the effect of structural factors. The dependence of the mechanism of strengthening of ferrite-pearlite steels on the grain size and the effect of the content of pearlite on their strength properties are established.

Popov, V.

doi: 10.1007/BF01156573pmid: N/A

The effect of thermodynamic and kinetic factors on the degree of dissolution of carbide, nitride, and carbonitride segregations in steels is considered and the possibilities of modeling the dissolution process using analytical, semianalytical, and numerical methods are analyzed.

Gervas'ev, M.

doi: 10.1007/BF01156574pmid: N/A

Steels for large size parts should provide uninterrupted and reliable operation of them at positive and negative temperatures of the ambient. Traditional methods for obtaining u set of high properties in large preforms are well known. Steels used for these purposes are alloyed with up to 3% Ni and 0. 5% Mo. The high cost of these alloying elements has led to the development of economically alloyed steels with elevated strength and reduced capacity for brittle fracture. A computational method for choosing the materials for large-size forgings and castings is presented.

Baraz, V.

doi: 10.1007/BF01156575pmid: N/A

Conditions for the development of the process of relaxation of stresses in spring alloys strengthened by plastic deformation and heat treatment are considered.