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DOI:
有色金属工程:2021,(10):14-19
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TIG电弧增材制造TC4钛合金的组织与性能
魏志祥1, 李国选2, 汪月勇2, 王超宁2, 汪奇鹏1, 孔见1
(1.南京理工大学;2.九江中船消防设备有限公司)
Microstructure and properties of TC4 titanium alloy produced by arc additive manufacturing
Wei Zhixiang1, Li Guoxuan2, Wang Yueyong2, Wang Chaoning2, Wang Qipeng1, Kong Jian1
(1.Nanjing University of Science and Technology;2.China State Shipbuilding Corporation Jiujiang Zhongchuan Fire Fighting Equipment Co Ltd)
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投稿时间:2021-02-09    修订日期:2021-03-22
中文摘要: 深部复杂地应力环境使得岩石的力学特性发生不同程度的改变,影响了地下开采掘进效率。为了改善大红山铜矿某巷道的爆破掘进效果,对巷道内的大理岩试件开展三维动静组合冲击试验,分析三维受力状态大理岩的动态力学特性、能量分布特征以及损伤演化规律。研究结果表明:当轴压为14 MPa,围压为5 MPa时,在应变率在79.19s-1~186.71s-1时,相对于单轴抗压强度,峰值应力可增加21.56%~135.42%;试件的能量吸收比与入射能成正线性相关,当能量吸收比不大于2.49 J/cm3时,试件仅有少数裂纹贯通,未发生破碎;当能量吸收比大于4.05 J/cm3时,试件完全破碎;试件的损伤随应变呈指数增加,当超过峰值应变后,损伤度加速增长。
Abstract:The microstructures?and properties of TC4 titanium alloy?prepared via?TIG arc additive manufacturing?were studied.?The results show that the microstructure of the arc additive?manufacturing?TC4 titanium alloy is different from the as-cast characteristics of the arc additive?manufacturing?steel material, which has significant heat-treated characteristics. It is a basketweave?structure composed of α and β phases.?Analyzing the formation process, it can be found that the primary structure of the additive body is dendrites, which has obvious orientation at this time; with the action of multiple reheating in the subsequent additive process, since the low thermal conductivity of titanium, the additive body maintains a higher?temperature, the dendrite composition gradually becomes uniform and transforms into anisotropic slender β crystal grains; then the temperature decreases and transforms into a two-phase basketweave?structure of α and β, and the α phase is in a supersaturated state, the β-phase precipitated?with nano-scale dots?can be observed,?the structure and performance is close to isotropic at this time,?the tensile strength?and the elongation after fracture at room temperature can reach up to 998 MPa?and?8.7%, respectively.
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基金项目:国防基础科研计划资助项目(JCKY2017206B002)
引用文本:
魏志祥,李国选,汪月勇,王超宁,汪奇鹏,孔见.TIG电弧增材制造TC4钛合金的组织与性能[J].有色金属工程,2021,(10):14-19.

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