Structural changes in corrosion-resistant steel 06Kh18ch

Zaporozh'e Machine Building Institute. Vol'nyansk Table Instrument Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 57–59, May, 1990.     

Effect of temperature and deformation conditions on hardening and softening of nitrogen-bearing corrosion-resistant steels

The effect of the temperature and deformation conditions of high-temperature thermomechanical treatment (HTMT) on the processes of hardening and softening of corrosion-resistant steels with up to 0.5% nitrogen is studied. Axisymmetric single and double compression and stress relaxation tests are performed with the help of Gleeble 1500 installation that ensures physical simulation of thermomechanical treatment. The hardening is determined in terms of changes in the hardness.     

Properties of and transformations in corrosion-resistant chrome-manganese steels

Corrosion-resistant high-strength steels, which are widely used in various branches of industry, contain large amounts of expensive and scarce alloying elements (Ni, Mo, etc.). To attain high strength, such steels require complex treatment including subzero treatment, plastic deformation, and aging, which also makes them more expensive. It is a topical problem to design economical materials and to devise technologies of enhancing their strength while economizing resources.Azov State Technical University (Mariupol). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 28–32, February, 1994.     

Delta-ferrite in hot-deformed metal of corrosion-resistant maraging steels

In some cases the -ferrite inherited from ingots is present in the hot-deformed metal of corrosion-resistant maraging steels. The residual -ferrite exerts a negative effect on the technological and operating characteristics of the metal. The present work presents results on transformations of -ferrite and variations of the properties of steels in quenching by different regimes. Recommendation on heat treatment of steels containing -ferrite are presented.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 36 – 39, July, 1995.     

Effect of the loading rate on the plastic deformation of corrosion-resistant martensitic-austenitic steels at cryogenic temperatures

Some modern products operate under conditions of rapid loading at cryogenic temperatures. To evaluate the serviceability of structural materials under such conditions, it is important to know how their mechanical properties and the nature of fracture change. In the present work, we investigated the effect of the loading rate in the range 10^–4–10^–1 sec^–1 on the mechanical properties of the martensitic-austenitic steels 03Kh12N10MT (VNS-25), 07Kh16N6 (SN-2A), and 08Kh14N8M (VNL-6) at 4.2–293 K.Deceased.Voronezh Polytechnic Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 33–36, February, 1994.     

Structural changes in prolonged aging of low-alloy pipe steels

Metal Science and Heat Treatment - In steel 20 failure begins in the boundaries between ferrite and pearlite grains. In steel 12Kh1MF failure begins at the surfaces of large carbides.     

Enhancing the impact toughness of corrosion-resistant maraging steels

The article investigates the effect of the parameters of heat treatment on the grain structure of maraging steels. A regime of heat treatment is suggested that ensures sufficiently high impact toughness of these steels.Dnepropetrovsk State University. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 17–20, August, 1994.     

Structural changes in corrosion-resistant steel 03Kh26N6T with initial anisotropy

Conclusion Resultant analytic curves (2) and (3) are an accurate mathematical model describing the anisotropy characteristics in steel 03Kh26N6T and their variation during superplastic deformation. In this case, the phenomenological laws governing structural changes are based on fully defined physical notions concerning the diffusion nature of the processes that take place in this case.Analysis of the structural changes in the steel with initial metallographic anisotropy indicates that in designing and calculating processes involving the superplastic deformation of hollow articles formed from sheet blanks, it is necessary to consider the different magnitude of the structural components in the characteristic directions and, accordingly, the different rate of structural changes. This may determine to a significant degree both the quality of the components produced (for example, variations in thickness) and variations in the optimal superplastic-deformation regime.The new quantitative data on steel anisotropy, which were obtained in this study, should be considered in developing mathematical models of the superplastic deformation process, which describe the shape variation of structurally sensitive materials with a high accuracy.It is obvious that to determine the range of optimal temperature-rate coditions of superplasticity, the relationships presented in the study make it possible to assess the activation energy of structural variations and, in turn, to ascertain not only the controlling mechanisms of superplastic deformation but also to solve the temperature problem of selecting the SPD regime.Tabbinsk Metallurgical Institute (Kair, ARE). The Moscow Institute of Steels and Alloys. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 20–23, September, 1991.