固溶处理对一种近α钛合金显微组织的影响  

Influence of Solution Treatment on Microstructure of a Near-α Titanium Alloy

作　　者：冯冉[1] 寇宏超[1] 常辉[1] 李金山[1] 薛祥义[1] 王义红[1] 周廉[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第10期1785-1789,共5页Rare Metal Materials and Engineering

基　　金：国家"973"计划(2007CB613802)资助

摘　　要：利用光学显微镜和扫描电子显微镜研究了固溶温度和冷却速度对Ti-Al-Sn-Zr-Mo-Si-Nb-Ta合金显微组织的影响。结果表明:该合金α+β/β的相变区间为1030～1035℃,在相变温度附近固溶处理,原始β晶粒长大迅速。在两相区固溶处理,随固溶温度的升高,晶界α相发生球化且球化趋势明显,初生αp含量减少。同时,两相区固溶导致晶内初生αp片端部出现"叉形"形貌,且随着固溶温度的升高和冷却速度的降低,"叉形"组织增大。在β相区固溶处理,随着冷却速度的降低,α片层宽度逐渐增大且趋于整齐,微观组织由针状马氏体过渡到网篮和魏氏并存的组织,最终变为魏氏组织。The effect of solution temperature and cooling rate on the microstructure of Ti-Al-Sn-Zr-Mo-Si-Nb-Ta alloy was investigated by optical microscope （OM） and scanning electron microscope （SEM）. The α＋β/β phase transformation temperature of the alloy was identified as 1030～ 1035 ℃, around which the original β grains grew fast. The grain boundary α phase trended to spheroidize and the content of primary αp phase decreased with the increasing solution temperature when the alloy was treated in α＋β field. Meanwhile, the ＂forked＂ morphology was found at the edge of intragranular primary αp lath, and it became larger with the increasing solution temperature or decreasing cooling rate. However when the alloy was treated in β field, the α lamella became wider and more orderly arranged, and it ultimately showed widmanstaten structure from acicular martensite via a mixed-structure with weave and widmanstaten structures.

关 键 词：钛合金 固溶 显微组织 

分 类 号：TG166.5[金属学及工艺—热处理]