Abstract
The solid solution and aging treatment for con-ventional manufacturing processes might not be suit-able for laser additive manufactured titanium alloys due to the different lamellar microstructures.In this study,the influence of aging temperatures(600,700 and 800 ℃)on microstructure and mechanical properties of titanium alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si was investigated.The results indicate that after solid solution treatment at 970 ℃ followed by water quenching,the alloy mainly consists of coarsening lamellar α phase in martensite α'matrix.Aging at 600 ℃ will not change the size of primary lamellar αphase but lead to huge amount of secondary α phases(αs)generating with very fine microstructure.By increasing the aging temperature,the number of αs decreases but with coarsened microstructures.When aged at 800 ℃,the width of the αs phase reaches 350 nm,almost 7 times wider than that aged at 600 ℃.The changing size of αs obviously influences the property of the alloy.The fine αs leads to high strength and microhardness but low plasticity,and specimen aged at 700 ℃ with suitable αs size has the best comprehensive properties.
基金项目
Beijing Municipal Science and Technology Project(Z171100000817002)
Young Elite Scientist Sponsorship Program by CAST()
National Key Research and Development Program of China(2016YFB1100401)
NETL
NSTL
万方数据