Influence of the Structure of Carbon Steels on the Corrosion,Hydrogenation, and Corrosion Cracking in Hydrogen-Sulfide Media

Materials Science - We study the influence of the structure of carbon steels on corrosion, hydrogenation, and corrosion cracking in NACE solution. The corrosion and hydrogenation rates of U8 steel...     

Corrosion properties of rolled products made of new low-alloy high-strength steels

It is shown that, in terms of the corrosion rate in the atmosphere, corrosion resistance in numerous acid, alkali, and salt solutions, corrosion-cracking resistance, and corrosion-fatigue resistance, the rolled products made of G2S-and KhS-type low-alloy high-strength steels with carbonitride hardening are on the same level as (or even better than) the rolled products of 09G2D commercial steel of lower strength used in the construction of railway cars. __________ Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 42, No. 5, pp. 108–112, September–October, 2006.     

New Type of Corrosion-Active Nonmetallic Inclusions and their Influence on the Corrosion of 38KHN3МFА Steel

Materials Science - We study the influence of corrosion-active nonmetallic inclusions on the corrosion of 38KhN3MFA steel. A new type of fluorine-containing inclusions of this kind with a size...     

Corrosion-Mechanical Properties of Materials for Reactor Vessels

We established that, in the course of electrolytic hydrogenation, an aqueous medium of boron regulation with pH 8 significantly accelerates the growth of fatigue cracks in 15Kh2MFA and 15Kh2NMFA hull steels, especially in the metal of welded joints, as a result of hydrogen embrittlement at the tip of a crack. An increase in the strength of steels by means of heat treatment, a decrease in the frequency of alternating loading, and an increase in the stress ratio significantly accelerate the growth of fatigue cracks. We discovered the strongest influence of hydrogenation in the near-threshold region for low values of the stress intensity factor. The tendency toward passivation and the anticorrosive properties of 15Kh2MFA steel (i _cor = 5 mA/m²) are higher than those of 15Kh2NMFA steel (i _cor = 20 mA/m²), which can be explained by the higher inhomogeneity of the structure of the latter. The metal of welded joints has the lowest cyclic corrosion crack resistance and the highest tendency toward hydrogen embrittlement under conditions of stable or transient modes.     

Evaluation of the efficiency of heat treatment of corrosion-resistant zinc-aluminum coatings

We propose a method for evaluating the influence of heat treatment on the antirust properties of plastically deformed coated sheet steel and suggest the optimum mode of heat treatment of sheet steel with zinc-aluminum coatings subjected to deformation and attacked by a corrosive environment.Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv. Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 30, No. 2, pp. 99–103, March–April, 1994.