Abstract
An investigation was made of the fatigue failure resistance of springs of 50KhFA steel and 40KKhNMVTYu alloy in synthesis gas and the influence of heat treatment on the fatigue resistance of these materials in air and in synthesis gas. For investigation of the phase composition of the surface layers an x-ray diffraction analysis was made of specimens. Photography was done on a URS-701 instrument. From the results of x-ray diffraction investigation of the phase analysis of specimens of 50KhFA steel after hardening from 860/sup 0/ C in an aqueous solution of water glass and tempering at 230/sup 0/ for 3 h with furnace cooling it was established that the steel contains Fe/sub 3/C alloy cementite and Fe/sub 2/O/sub 3/ iron oxide. The probability of reliable operation of the springs at a gas temperature of up to 187/sup 0/ C and a loading frequency of 300 cycles/min increased by 20-25% in comparison with the probability of reliable operation of springs of 50KhFA steel after oil hardening.
Published Version
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