宗学文,刘文杰,高中堂,徐文博,高倩,王磊.不同铸型对钛合金微观组织及力学性能的影响[J].稀有金属材料与工程,2020,49(5):1681~1688.[宗学文,liu wenjie,gao zhongtang,xu wenbo,Gao qian,wang lei.Effect of Different Molds on Microstructure and Mechanical Properties of Titanium Alloys[J].Rare Metal Materials and Engineering,2020,49(5):1681~1688.]
不同铸型对钛合金微观组织及力学性能的影响
投稿时间:2019-07-15  修订日期:2019-09-10
中文关键词:  钛合金  陶瓷型铸型  石墨型铸型  冷却速度  微观组织  力学性能
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      为了研究陶瓷和石墨铸型对ZTC4钛合金微观组织机理的影响,本文采用数值模拟与实验分析相结合的方法,研究了两种铸型的试样在凝固传热过程中的冷却速度、凝固速度、凝固时间对微观组织和力学性能影响。结果表明:与陶瓷型试样相比,石墨型的散热效果好、冷却速度快、凝固速度高,且石墨型的冷却速度提高了52.04%,使得微观组织为急冷生成的细小板条马氏体α,晶粒较小、取向较多、凝固厚度大,导致力学性能中的屈服强度、抗拉强度、硬度分别提高了6.7%、2.6%和4.2%,但伸长率和断面收缩率分别降低了37%和34.5%。同时同种铸型的不同位置对冷却速度快慢的影响依次为:中间>底部>顶部。
Effect of Different Molds on Microstructure and Mechanical Properties of Titanium Alloys
英文关键词:Titanium alloy  Ceramic mold  Graphite mold  Cooling rate  Microstructure  Mechanical properties
英文摘要:
      The effects of different casting moulds on the microstructures and mechanical properties of ZTC4 titanium alloy were studied. The effects of cooling rate, solidification rate and solidification time on the microstructures and mechanical properties of ZTC4 titanium alloy were studied by numerical simulation and experimental analysis.The results show that compared with the ceramic sample, the graphite sample has better heat dissipation effect, faster cooling speed and higher solidification speed, which makes the microstructure of the sample to be fine lath martensite alpha produced by quenching, with smaller grain size, more orientation and larger solidification thickness.The yield strength, tensile strength and hardness of the mechanical properties increased by 6.7%, 2.6% and 4.2% respectively, but the elongation and section shrinkage decreased by 37% and 34.5%, respectively. At the same time, different positions of the same mold have some influence on the cooling rate. The cooling rate at different positions of the sample is in the order of middle > bottom > top.
作者单位E-mail
宗学文 西安科技大学 a15236617652@163.com 
刘文杰 西安科技大学  
高中堂 西安科技大学  
徐文博 河南工学院  
高倩 西安科技大学  
王磊 西安科技大学  
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