Application of GB/T 6394-2017 in Grain Size Determination of Titanium Alloy

The determination of grain size for various titanium alloys was defined. The grain size of α,β titanium alloys was determined by the comparison method and intercept procedure in GB/T 6394-2017. The methods of grain size determination for equiaxed microstructure, duplex microstructure, basketweave microstructure, widmanstatten, non-equiaxed microstructure and ultrafine grain microstructure in α-β two-phase titanium alloys were studied. The results show that comparison method and intercept procedure in GB/T 6394-2017 can be used to determine the grain size of α and β single-phase titanium alloy, α-β two-phase titanium alloy with definite phase content and ultrafine grain microstructure after recrystallization heat treatment.