Metal Science and Heat Treatment

Kollerov, M.; Il'in, A.; Mamonov, A.

doi: 10.1007/BF01402784pmid: N/A

During heat treatment, a temperature field that is nonunifonn through the section develops in the semifabricates [semifinished products] or the finished products, leading to the appearance of transitory thermal stresses σ1. If the level of these stresses exceeds the yield strength of the alloy at the corresponding temperature, plastic deformation takes place, leading to deformation of the semifabricate. After the temperature equalizes through the section of the semifabricate, there remains some residual deformation, which leads to the appearance of residual stresses σres. We shall present the results of studies of the thennal fields and the residual stresses through the section of plates of VT22 and VT23 titanium alloys and make some recommendations on selection of the heat treatment regimes for these alloys.

Antsiferov, V.; Maslennikov, N.; Bobrova, S.; Timokhova, A.; Bezmaternykh, N.

doi: 10.1007/BF01402785pmid: N/A

The properties and the formation of the structure of powder metallurgy (P-M) materials are intimately bound up with the hereditary effect that the substructure acquired by plastic deformation of a mixture of the initial powders pressed into a compact has on high-temperature consolidation during subsequent sintering. The article considers how the composition of P-M steels affects the laws governing the properties and the formation of structure during heating and sintering.

Il'inskii, V.; Kostyleva, L.; Grebnev, Yu.

doi: 10.1007/BF01402786pmid: N/A

Transformation of austenite by a shear mechanism in an intermediate range leads to the formation of structures consisting of plate and acicular ferrite. The acicular structure of Widmanstätten ferrite has not found practical application and has not been adequately studied, although the inherited effect of this structure in lowering the ductility of steel is of practical importance. The present article is devoted to a detailed analysis of this structure and its effects.

Endrzheevskii, B.; Meshkov, Yu.; Pakharenko, G.

doi: 10.1007/BF01402787pmid: N/A

The effects of phosphorous segregation on the properties of steels containing two types of globular cementite: (1) preferential distribution at the grain boundaries, and (2) uniform distribution within the grains, have been studied. It is shown that the brittle strength of the investigated steels depends only upon the particle size of the cementite, and is independent of the phosphorous concentration. The brittleness of the steels was evaluated by an original method proposed by Yu. Ya. Meshkov.

Zinchenko, S.; Vorob'ev, Yu.; Ivanova, G.; Kuznetsov, Yu.; Efinmovich, A.

doi: 10.1007/BF01402788pmid: N/A

The causes of internal failures during the hot rolling of ingots formed from austenitic high-temperature steels are investigated.

Getsov, L.; Krasheninnikova, I.

doi: 10.1007/BF01402789pmid: N/A

Steel 08Kh17N6T in recent years has become widely used for manufacturing parts for pumps and gas turbines in connection with its better mechanical properties and corrosion resistance, compared with the chromium steel 20Kh13 used previously for this purpose. In this paper, we present the results of an investigation of the longterm and fatigue strength and the corrosion resistance of steel 08Kh17N6T, and also data on the effectiveness of using it to manufacture compressors.

Verin, A.

doi: 10.1007/BF01402790pmid: N/A

We demonstrate the possibility of changing the strength characteristics in single-crystalline samples of the intermetallic compound Ni3Al, whose production is closely connected with three-dimensional growth of the primary γ-phase (unhardened solid solution of aluminum in nickel).

Elagin, V.; Zakharov, V.

doi: 10.1007/BF01402791pmid: N/A

This article examines progress recently made in the strengthening of aluminum alloys by heat treatment. The treatment maximizes strength while leaving the alloy with relatively high corrosion resistance.