摘要
研究了固溶处理后不同时效温度对Ti-5Al-2V-3Fe-0.2O合金热轧板材显微组织与力学性能的影响。结果表明:热轧态板材组织主要由α相和β相组成;固溶处理后,组织中出现了α相向β相转变现象,由初生α相及亚稳态β转变组织组成;通过时效处理,亚稳态β转变组织部分分解,析出次生α相并形成晶间β相,随着时效温度从450℃升高到550℃,亚稳态β转变相进一步减少,次生α相增多并长大,初生α相逐渐粗化;与热轧态相比,固溶时效处理后板材抗拉强度和断后伸长率均提高,并且随着时效温度升高,抗拉强度逐渐降低,伸长率逐渐提高;940℃×15min/AC+500℃×6 h/AC热处理后的板材强度和伸长率分别达到1260 MPa、8.5%,具有较佳的综合性能。
The effects of different aging temperatures on microstructure and mechanical properties of hot-rolled Ti-5Al-2V-3Fe-0.2O alloy plate after solid solution treatment were investigated. The results show that hot rolled sheet microstructure is mainly composed of α-phase and β-phase. After the solution treatment, the transition from α phase to βphase occurs in the alloy, which consists of primary α-phase and metastable β transformation microstructure. Through aging treatment, the metastable β transformation microstructure is partly resolved, the secondary α-phase precipitates and intergranular β-phase is formed. With the aging temperature increasing from 450 ℃ to 550 ℃, the metastable β-transformed phase is further reduced, the secondary α-phase increases and grows up, and the primary α-phase gradually coarsens.Compared with hot rolled plate, the tensile strength and elongation of the alloy plate improve after solution and aging treatment. Moreover, with the aging temperature increasing, the tensile strength decreases gradually and the elongation increases gradually. After the heat treatment at 940℃×15 min/AC+500℃ ×6 h/AC, the strength and elongation of the sheet reach 1260 MPa and 8.5% respectively, which has better comprehensive properties.
作者
张俊晓
李志敏
史亚鸣
蒋泰旭
张玉勤
ZHANG Junxiao;LI Zhimin;SHI Yaming;JIANG Taixu;ZHANG Yuqin(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Titanium Industry Co.,Ltd.,Chuxiong 651209,China;Engineering Technology Research Center of Titanium Products and Application of Yunnan Province,Chuxiong 651209,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第24期188-192,共5页
Hot Working Technology
基金
云南省省院省校科技合作专项项目(2013IB006)
云南省科技创新平台建设项目(2013DH012)
关键词
钛合金热轧板材
固溶时效处理
显微组织
力学性能
hot rolled titanium plates
solution and aging treatment
microstructure
mechanical properties
