Effects of Heat Treatments on the High-temperature Mechanical Properties of TC11 Titanium Alloy
The microstructure of a TC11 titanium alloy was regulated by changing the heat treatment system,and the relationships between the microstructure and high-temperature mechanical properties of the TC11 titanium alloy under different heat treatment processes were studied.The results show that with increasing heat treatment temperature,the grain size of the primary equiaxed α phase increases,and the content gradually decreases.The proportion of the β phase content gradually increases,accompanied by an increasing content of the acicular secondary α phase.In a room-temperature service environment,the TC11 alloy processed by heat treatment B(960℃×2 h,AC+530℃×6 h,AC)has good strength plasticity matching,with a tensile strength(Rm)of 1 089 MPa,yield strength(Rp0.2)of 976 MPa,elongation at break(A)of 19%,and a reduction of area(Z)of 51%.The mechanical properties of the alloy processed by heat treatment A(950℃×2 h,AC+530℃×6 h,AC)are the best,with an Rm of 771 MPa,Rp0.2 of 584 MPa,A of 19%,and Z of 71%under a 500℃high-temperature service environment,increasing by 8.2%,6.3%,35%and 73%,respectively,compared with those of the heat treatment C(970℃×2 h,AC+530℃×6 h,AC).In the service environment above 500℃,the smaller the grain size is,the lower the high-temperature strength of the alloy,which is contrary to the mechanical properties at room temperature.At this time,to obtain a good balance of strength and plasticity,heat treatment B is the best.
TC11 titanium alloyheat treatmentmechanical propertieshigh temperature performancemicrostructure
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