固溶时效对新型高强耐蚀钛合金组织与性能的影响  

Effect of Solution Aging Treatment on Microstructure and Properties of New High Strength Corrosion Resistant Titanium Alloy

作　　者：肖寒[1] 张宏宇 谭聪 黄海广[1] 余堃 周荣锋[1] Xiao Han;Zhang Hongyu;Tan Cong;Huang Haiguang;Yu Kun;Zhou Rongfeng(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Titanium Industry Co.,Ltd,Chuxiong 651209,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]云南钛业股份有限公司,云南楚雄651209

出　　处：《稀有金属材料与工程》2021年第5期1775-1780,共6页Rare Metal Materials and Engineering

基　　金：云南省重大科技专项计划(202002AB080001-3);国家重点研发计划项目(2016YFB0301202)。

摘　　要：以一种新型高强耐蚀钛合金为研究对象,对钛合金热轧板材进行了固溶时效处理,研究了固溶时效工艺对新型高强耐蚀钛合金板材微观组织、力学性能与腐蚀性能的影响规律。结果表明:当固溶温度由900℃升高至930℃,板材中等轴α相和β转变组织明显增多,且皆为等轴组织形貌;当固溶温度升高至960℃时,板材中等轴α相和β转变组织减少,并出现大量针状次生α相,其组织由等轴组织转变为双态组织。随固溶温度升高,板材强度和硬度增加,塑性逐渐降低;而腐蚀电流密度和腐蚀速率先降低后增加。新型高强耐蚀钛合金板材900℃固溶30min、580℃时效3 h后综合力学性能最佳,其耐腐蚀性能较好。A new high-strength corrosion-resistant titanium alloy was taken as the research object,and its titanium alloy hot-rolled sheet was subjected to different solution aging heat treatments.The effects of solution aging processes on the microstructure,texture,mechanical properties and corrosion resistance of titanium alloy sheets were studied.The results show that when the solution temperature increases from 900℃to 930℃,the equiaxedα-phase andβ-transformed structures are significantly increased,and they are all equiaxed morphologies.When the solution temperature increases to 960℃,the equiaxedα-phase andβ-transformed structures decrease,and a large number of needle-like secondaryα-phases appear,and the structure changes from the equiaxed structure to the dual-state structure.With the increase of solution temperature,the strength and hardness of the sheet increase,and the plasticity gradually decreases,while the corrosion current density and corrosion rate show a trend of decreasing first and then increasing.After the Ti603 titanium alloy sheet is treated at 900℃for 30 min and aging at 580℃for 3 h,it has the best comprehensive mechanical properties and good corrosion resistance.

关 键 词：耐蚀钛合金 固溶时效 组织演变 力学性能 耐腐蚀性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]