Research on the Influence of TC4 Alloy Structure Evolution on Mechanical Properties
In the welding process of aero-engine fan casing,rotor blade,titanium alloy integral blade disk and other components,the microstructure of weld parts is changed,which reduces the fatigue performance and leads to the cracking failure of weld parts.This paper mainly studies the high-cycle fatigue performance of TC4 titanium alloy under five heat treatment states,and the results show that at room temperature,700 ℃,800℃.900 ℃,1 000 ℃ and 1 100 ℃,the fatigue strength of TC4 alloy is 782.7 MPa,780 MPa,725.6 MPa,660 MPa,553.3 MPa and 590 MPa,which meet 95％confidence.With the increase of heat treatment temperature,the high cycle fatigue strength of TC4 alloy decreases gradually,and the fatigue strength at 1 100 ℃ is slightly higher than that at 1 000 ℃.The element redistribution process during heat treatment is the main reason that the high cycle fatigue limit of the alloy decreases with the increase of heat treatment temperature.
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