Effect of Cooling Method After Solution on Microstructure and Mechanical Properties of New Near-β Ti Alloy Ti-5321
SONG Bo
AN Mingyu
WANG Hongyang
WANG Yisen
ZHEN Jinming
Abstract：Influence of cooling method after solution on microstructure evolution,phase transformation and mechanical properties of new hi gh strength Ti alloy Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe(these values are mass fraction multiplied by 100,Ti-5321)was studied in this work.The results showed that different microstructures were developed depending on solution cooling method.The samples under different cool-ing conditions experienced different phase transformation processes,leading to α precipitates exhibiting different characters after aging treatment and finally obtained different properties.For the air cooled sam-ple,two types of intermediate phases ω and O'would be formed in β matrix.In comparison with the water quenched sample,the air cooled sample developed α precipitates having smaller size and larger number density,as well as stronger precipitation hardening effect.When aged at 600 ℃,the air cooled sample ob-tained highest ultimate tensile strength 1 421 MPa,and the strength of water quenched one was 1 220 MPa.In the furnace cooled sample,these a precipitates presented plate-like shape,forming basketwave microstructure.It could not be affected by aging treatment,and the furnace cooled alloy had lowest strength and best ductility.
Keywords：titanium alloycooling methodmicrostructuremechanical properties
Publication Date：2024-06-28
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：9( 53-61 )