铸造态钛合金力学性能及抗弹性能研究  

Mechanical Properties and Ballistic Performance of As-cast Titanium Alloys

作　　者：余东辉[1] 范群波[1] 王富耻[1] 夏雨萌 穆啸楠 

机构地区：[1]北京理工大学,北京100081

出　　处：《稀有金属材料与工程》2017年第8期2234-2239,共6页Rare Metal Materials and Engineering

基　　金：教育部"新世纪优秀人才支持计划"(NCET-12-0051)

摘　　要：以铸造态钛合金β20C、TC4、TA15和TA18为研究对象,开展了以钛合金为面板、A3钢为背板的复合装甲抗弹性能试验、基于分离式Hopkinson Bar技术的动态压缩试验和室温条件下的准静态压缩和准静态拉伸试验。并对铸造态钛合金β20C、TC4、TA15和TA18抗弹性能的影响因素进行了对比与分析。结果发现:铸造态钛合金β20C的A3钢背板具有最小残余穿深值4.7 mm,分别比铸造态钛合金TC4、TA15和TA18低22%、37%和23%,且β20C的质量防护系数也相应有最大值2.61,表明β20C具有最佳抗弹性能;铸造态钛合金β20C的动态压缩强度、准静态抗压强度、准静态拉伸屈服强度和准静态抗拉强度值分别达1578、1474、1052和1101 MPa,各强度值在4种钛合金中均是最高的,表明动态强度及准静态强度对铸造态钛合金的抗弹性能的影响是决定性的;4种铸造态钛合金的冲击吸收功、动态塑性、临界断裂应变和断后伸长率则与抗弹性能呈现出一定的波动关系,表明冲击吸收功、动态塑性和准静态塑性对抗弹性能的影响是非决定性的;铸造态钛合金β20C靶板正面出现了尺寸为10 mm×12 mm的开坑现象,在4种铸造态钛合金中是最明显的,同时没有发现明显的剪切冲塞破环现象。A series of experiments were conducted on as-cast titanium alloys β20C, TC4, TA15 and TA18, including the ballistic test, the dynamic compression test, the quasi-static tensile test, as well as the quasi-static compression test. Based on the experiments, factors affecting the ballistic performance of as-cast titanium alloys were compared. Results show that as-cast titanium alloy β20C has the minimum of DOP, which is 4.7 mm, about 22%, 37% and 23% less than that of as-cast titanium alloys TC4, TA15 and TA18, respectively. Besides, mass efficiency of β20C is 2.61 which is the maximum among the four as-cast titanium alloys, indicating that β20C has the best ballistic performance. Furthermore, dynamic compression strength, quasi-static compression strength and quasi-static tensile yield strength together with quasi-static tensile strength of β20C are 1578, 1474, 1052 and 1101 MPa, respectively, larger than the corresponding values of the other three titanium alloys. While the impact absorbing energy, dynamic ductility and critical fracture strain and fracture elongation don＇t reflect the ballistic performance very well. In addition, the cratering size of the target frontage of β20C is 10 mm×12 mm, being the biggest one among the four as-cast titanium alloys, without obvious shearing plugging damage.

关 键 词：铸造态钛合金 抗弹性能 动态力学性能 准静态力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]