Improvement of Low-Alloy Pipe Steel Sulfide Stress Cracking Resistance

Metallurgist - The influence of sheet microstructure formed by various thermomechanical processing schedules on sulfide stress cracking (SSC) resistance under uniaxial tension for low-alloy pipe...     

Calculation of Maximum Permissible Load Currents under Cyclic Loading Conditions for Cables Laid in the Ground and in Pipes in the Ground

A method for calculating the maximum permissible load current under the conditions of cyclic daily load curve is developed. A system is suggested for parallel cables laid in the ground, including in pipes. The coefficients for determining permissible load currents are calculated for different laying variants. Calculated data for cables arranged in 2 × 2 and 2 × 4 blocks are presented.     

A method for the prevention of premature failures of power plants using hydrogen as the working medium

Qe analyze failures of power-generating units working on liquid hydrogen caused by the most dangerous type of embrittlement—reversible hydrogen embrittlement of the metal. We consider the existing methods for the protection of various structural elements against hydrogen embrittlement and discuss their advantages and shortcomings. A method for the protection of difficultly accessible internal hollows of power-generating units against hydrogen embrittlement by introducing active gaseous admixtures in the working volume is described in detail. The mechanism of action of these admixtures is analyzed refractory alloy as examples, we demonstrate the positive effect of admixtures to gaseous hydrogen under a pressure of 35 MPa. The proposed method enables one, in some cases, to use hydrogen (as a new ecologically pure fuel) without serious changes in the structure of the unit and in the technological process. Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv. Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 34, No. 4, pp. 53–56, July–August, 1998