EFFECT OF HEAT-TREATMENT AND WELDING ON THE FATIGUE RESISTANCES OF MOLYBDENUM ALLOYS OF THE MO-ZR-B AND MO-AL-B SYSTEMS

Low-alloy molybdenum alloys are widely used in high-duty welded struct ural parts and power units that operate under conditions of extremely high temperatures and loads in aggressive gas media. In some cases, in particular in storing and transporting the parts, they are subjected to cyclic and vibration loads, which may cause their fatigue and prema ture failure. The present paper gives the results of a study of the fa tigue resistance of thin rolled sheets and welded joints of molybdenum alloys TsM-6 and TsM-10 with allowance for the structural state of th e material and the factors of the manufacturing process, particularly the heat treatment regime.