Examining the structure of mill rolls made of 9X2MΦ and 8X3CΓΦ steels using the ultrasonic method for quality control

The microstructure of specimens of 9X2MΦ and 8X3CΓΦ steels taken from working rolls of a reversing mill was examined. A correlation between characteristics of the crystal structure of the metal and the intensified attenuation of ultrasonic waves was found. Ultrasonic inspection was carried out using an ultrasonic flaw detector (Krautkramer Co.). The microstructure was examined by means of traditional metallographic analysis methods, which were implemented using a scanning electron microscope; X-ray spectral microanalysis and electron backscatter diffraction were used. The morphology and elemental composition of discontinuity flaws were studied; as well, phase maps, crystallite misorientation histograms, and Taylor factor maps were plotted for specimens taken from the defect zone of a 9X2MΦ steel working roll. © 2013 Pleiades Publishing, Ltd

Influence of defects on the ductility of liquid 9X2MΦ and 75X3MΦ steel

Viscosimetric data on liquid 9X2MΦ and 75X3MΦ steel taken from working rollers of a reversible rolling mill with different ultrasonic behavior illustrate the influence of defects recorded in ultrasound monitoring on the temperature and time dependence of the liquid steel's kinematic viscosity. A Krautkremer ultrasonic defectoscope is employed in monitoring. The viscosity of the liquid steel is measured by means of damping torsional oscillations of a crucible with melt in heating and subsequent cooling in the range 1500-1580°C. © 2013 Allerton Press, Inc

A study of the structure of forged pieces of 75X3MΦ steel using the ultrasonic method for quality control

The microstructures of 75X3MΦ steel specimens that were sampled from forged pieces of support shafts of rolling mills was investigated. A correlation between the presence of a carbide network and increased attenuation of ultrasonic waves was established. Ultrasonic testing was performed using a Krautkremer ultrasonic flaw detector. The microstructure was studied using conventional metallographic-analysis methods. The nanoindentation method was used to measure the Young modulus of the phase components of 75X3MΦ steel specimens, carbides, and the matrix. A comparative evaluation of their acoustic characteristics was performed. © 2012 Pleiades Publishing, Ltd

Influence of the production method on the viscosity of liquid 100Γ13X2Lcyrillic steel

Viscosimetric data are derived for liquid 100Gcyrillic13X2Lcyrillic steel during the heating and subsequent cooling of samples. The samples are taken from ingots produced by different methods: by oxidation and by remelting. On the basis of the experimental temperature and time dependences of the liquid steel's kinematic viscosity, the optimal melt treatment prior to solidification is identified. © 2013 Allerton Press, Inc

Parallel numerical simulation of wave propagation in 3D elastic medium with application of the Laguerre transform

Abstract. In this paper, we apply an approach for numerical simulation of elastic waves in heterogeneous mediu