We analyze the mass transport in high-gradient thermal fields formed in microvolumes of the material in the course of friction stir welding (FSW) and modification of the upper layer (friction stir ...processing). A simplified Fe–Cr diffusion system with unidirectional thermodynamic excitations is analyzed. The character of mass transport is determined by thermal diffusion, which affects the final distribution of the concentration of diffusing elements in the friction region. The chemical potentials of the components of the process lead to phase transformations typical of the (Fe–C)–Cr ternary system. We present the results of analysis of these phenomena. The verification of solutions is realized by analyzing an example of adhesive chromium layer deposited on a matrix of S235JR and S355 low-alloyed steels. A modeled heat source in the form of laser radiation is used in the microvolumes of the analyzed friction unit.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
We propose a modified model for the description of crack growth formulated in terms of a probabilistic approach based on a two-parameter Weibull distribution. Unlike the earlier proposal of the ...authors, in this new model, the applied level of stresses explicitly appears in all deduced equations. The process of crack growth is described by a difference equation fundamental for the proposed model. The efficiency of the method is illustrated by an example of prediction of crack growth and fatigue life for specimens of laser-hardened medium-carbon steel subjected to reversed torsion. The character of fatigue crack growth and specific features of fractographic pictures of the fracture surfaces in the investigated specimens are analyzed.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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