Influence of heat treatment and welding on fatigue strength in molybdenum alloys of Mo-Zr-B and Mo-Al-B systems

Fatigue test results are presented for thin sheets and welded joints of molybdenum base alloys TsM6 and TsM10. It is shown that the fatigue strength of alloys is greatly dependent on their structural states (deformed, polygonized, recrystallized, cast). Deformed alloys have the highest value of endurance limit, cast and recrystallized alloys posses the least one. The dependence of endurance limit on grain size obeys the power law. Some correlations were established between fatigue resistance and short-term tensile properties of the alloys studied