Changes in mechanical properties, structure and phase composition of industrial alloy 47CrNiMо after aging

The development of the modern nuclear industry leads to the need to create materials that operate at high temperatures, high mechanical loads, and aggressive contact environments. Alloy 47ХНМ is recommended for use in nuclear reactors, as it has high resistance to plastic deformation and relaxation resistance under conditions of static and cyclic loading, low elastic hysteresis, high fatigue strength and high corrosion resistance.The article presents the results of a study of changes in the mechanical properties, phase composition and structures of the industrial alloy 47ХНМ after aging using the following methods: X-ray diffraction analysis, microhardness measurements, tension in a tensile testing machine.The dependence of microhardness on the aging time interval has been established. The maximum high microhardness was recorded on the samples after aging. The dependences of the ultimate strength and relative elongation of the studied samples on the aging time were revealed. In this work, X-ray diffraction patterns of the 47ХНМ alloy were analyzed and a cluster model of grain boundaries was proposed.