铸造技术2014，Vol.35Issue(11)：2625-2628,4.
抽拉速率对Ti-48Al-6Nb合金籽晶法定向凝固组织的影响
Effects of Drawing Rate on Microstructure of Directionally Solidified Ti-48Al-6Nb Alloy with Seeding Technique
摘要
Abstract
The effect of different drawing rates on directionally solidification fully lamellar microstructure of Ti-44Al-3Nb-2Si alloy with a polycrystalline seed was studied.The results show that,when the withdrawal rate is 6 μm/s,α-phase grow with planar/cellular morphology at unpreferred orientation,which make its lamellar microstructure parallel to the growth direction.Solid/liquid interface morphology begins to shift from cellular to dendritic when the withdrawal rate increases to 15 μm/s.There exists a couple growth of a phase with unpreferred growth direction of <11(2)0> and β3 phase with preferred growth direction of <11 (2)0>.When drawing rate growing to 25 μm/s,the seeding process easily failed because β phase formed in the interdendritic areas.Ti-48Al-6Nb can be seeded at a low drawing rate using Ti-44Al-3Nb-2Si seed,which made the α phase grown at planar.关键词
Ti-44Al-3Nb-2Si籽晶/定向凝固/籽晶法/全片层组织Key words
Ti-44Al-3Nb-2Si seed/ directional solidification/ seeding technique/ lamellar structure分类
金属材料引用本文复制引用
周家东,沈军,杜玉俊,熊义龙,刘光振..抽拉速率对Ti-48Al-6Nb合金籽晶法定向凝固组织的影响[J].铸造技术,2014,35(11):2625-2628,4.基金项目
国家自然科学基金资助项目(51174167) （51174167）
凝固技术国家重点实验室自主研究课题资助项目(63-TP-2011) （63-TP-2011）
