Ti-6Al-4V合金在不同工艺条件下水淬后的组织演变  

Microstructural Evolution of Ti-6Al-4V Alloy During Water Quenching Under Different Processing Conditions

作　　者：张润奇 蔡一钦 李壮 李晋宇 周琦[2] 崔席郡 Zhang Runqi;Cai Yiqin;Li Zhuang;Li Jinyu;Zhou Qi;Cui Xijun(College of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;School of Environment and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,Chin)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110136 [2]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《稀有金属材料与工程》2020年第9期3005-3011,共7页Rare Metal Materials and Engineering

基　　金：National High Technology Research and Development Program of China(863 Program)(2015AA03A501);Liaoning Provincial Science and Technology Plan Project(2015020189)。

摘　　要：为了获得Ti-6A1-4V合金最佳的机械性能,重点在于了解在不同工艺条件下水淬后的微观结构演变。可使用热模拟机进行Ti-6A1-4V合金的热模拟。结果表明,试样经过固溶处理后可获得完全的马氏体组织。固溶后水淬导致硬度增加,这归因于α’和α"的存在。试样在850℃等温保温且进行水淬后形成层状结构,硬度进一步提高。850℃下经变形后水淬出现等轴晶,由于晶界的强化,维氏硬度(HV)达到最大值(5840 MPa)。试样在850℃变形后等温保持在600℃时,组织由α相,层状α/β和等轴晶粒组成。变形后的冷却及等温保温处理导致α相及晶粒尺寸增大,其尺寸范围在324~706 nm之间,导致硬度降低。It is important to understand the microstructural evolution of Ti-6 A1-4 V alloy during water quenching under different processing parameters in order to obtain optimum mechanical properties of the alloy.The thermal simulation of Ti-6 A1-4 V alloy was conducted using a thermomechanical simulator.The results have shown that a fully martensitic micro structure was obtained after solution treatment.Water-quenching after solution resulted in hardness increase,and this was attributed to the presence ofα’andα".The lamellar structure formed when the specimen was water-quenched after isothermal holding at 850℃,and the hardness further increased.Colony appeared after deformation at 850℃with subsequent water quenching,and the Vickers hardness HV reached the maximum value(5840 MPa)because of the grain boundary strengthening.The micro structure was composed of a phase,lamellar coloniesα/βand colony when the specimen was isothermally held at 600℃after deformation at 850℃.Cooling and isothermal holding after deformation increased the width of a phase and colony,which was in the range of 324~706 nm for equiaxed grains.This caused a decrease in hardness.

关 键 词：TI-6AL-4V合金 水淬 等温保温 层状结构 硬度 

分 类 号：TG146.23[一般工业技术—材料科学与工程]