固溶处理对Ti60合金组织及拉伸性能的影响  

Influence of Solution Treatment on the Microstructure and Mechanical Property of Ti60 Alloy

作　　者：罗文忠[1] 孙峰[1] 赵小花[1] 张晓园[1] 雷锦文[1] 

机构地区：[1]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《稀有金属材料与工程》2017年第12期3967-3971,共5页Rare Metal Materials and Engineering

基　　金：国家国际科技合作专项(2013DFR50090)

摘　　要：通过对600℃用Ti60高温钛合金在不同温度固溶热处理,获得全α'和α+α'2种马氏体组织,对比了2种组织特征及室温、300和600℃下的拉伸性能,探讨了初生α相对力学性能的影响规律。结果表明淬火过程中β相全部转变为α'马氏体相,α+α'组织保留约10%初生α相,初生α相的存在引起马氏体组织抗拉强度降低和塑性提升,进而获得更加匹配的强度和塑性。其中α+α'组织韧窝尺寸较大,因为少量初生α相能够细化β晶粒尺寸,通过增加晶界面积阻碍裂纹扩展,进而提高塑性,随着温度升高,初生α相对合金塑性影响逐步减小。Both of the α＇ and α＋α＇ martensite microstructures of Ti60 alloy as high temperature titanium alloy used up to 600°C were obtained by solution treatments at different temperatures.The morphologies of the two microstructures were compared as well as the tensile properties at room temperature,300°C and 600°C.The results indicate that all the β phase transforms to α＇ phase during quenching,and only about 10% primary α phase retains in the α＋α＇ microstructure.The little decrease of strength and great increase of ductility can be attributed to the partial solution of primary α phase.The size of dimple observed on the fracture of specimens with α＋α＇ microstructure at room temperature is larger than that with α＇ microstructure.Because the retained primary α phase dedicates to the refinement of β grains,leading to the disturbance of expansion of cracks by increasing the length of grain boundaries.The influence of the primary α phase on the tensile properties decreases with the increasing of the tensile temperature.

关 键 词：近Α钛合金 固溶处理 马氏体 初生Α相 拉伸性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]