Hydrogen and flakes in steel

Flakes are special discontinuities in steel parts that have the form of silver-colored spots on fracture surfaces or thin hair-like cracks on a ground and etched template. They appear and grow after a considerable incubation period, often in the operation of the part, which makes them a dangerous defect. Depending on the dimensions, number, and position in the metal, flakes can decrease the toughness and ductility of steel to zero and reduce markedly the service life of steel parts and structures, causing unexpected and serious failures. The present review briefly generalizes recent works devoted to the formation of flakes in steel. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 12–18, November, 1997.     

Effect of preliminary heat treatment on phase transformations and properties of steel Kh15N5D2T (VNS-2)

Conclusions Preliminary heat treatment has a substantial effect on the kinetics of the transformation, the amount of retained austenite, the grain size, and the work of crack propagation in steel Kh15N2D2T after final heat treatment.N. I. Lobachevskii Gorki Physicotechnic Institute of Gorki State University. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 63–64, May. 1978.     

Composites with improved absorption of noise and vibration

The development of composites based on thermosetting resins with improved vibration and noise absorption is considered. Mathematical and topological models are proposed to describe the influence of the composition on the vibration and noise absorption and elastic properties of the composites. The composition of filled epoxy, polyester, and polyurethane vibration-absorbing composites is optimized in terms of their loading, dynamic, and economic characteristics.     

Discrete fourier transform on multicore

This article gives an overview on the techniques needed to implement the discrete Fourier transform (DFT) efficiently on current multicore systems. The focus is on Intel-compatible multicores, but we also discuss the IBM Cell and, briefly, graphics processing units (GPUs). The performance optimization is broken down into three key challenges: parallelization, vectorization, and memory hierarchy optimization. In each case, we use the Kronecker product formalism to formally derive the necessary algorithmic transformations based on a few hardware parameters. Further code-level optimizations are discussed. The rigorous nature of this framework enables the complete automation of the implementation task as shown by the program generator, Spiral. Finally, we show and analyze DFT benchmarks of the fastest libraries available for the considered platforms.     

Influence of alloy elements on the stress-corrosion cracking resistance of iron alloys

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 58–63, September, 1990.     

Optimizing the Material Fluxes in Flexible Production Systems with Interchangeable Machining Equipment

Russian Engineering Research - The material fluxes in the machining sections of flexible production systems may be optimized by appropriate organization of the equipment, on the basis of simulated...