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TA2钛金属柱壳外爆绝热剪切碎裂及微观组织演化
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宁波大学机械工程与力学学院

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国家自然科学基金资助(项目号No. 11672143、No. 11932018)


Multiple adiabatic shear fragmentation and microstructure evolution of Explosive-driven TA2 pure titanium cylinders
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    摘要:

    柱壳外爆断裂存在多种断裂模式的竞争与耦合,其控制及影响因素一直是人们关注的。本文对绝热剪切敏感TA2工业纯钛柱壳在不同爆压下开展碎裂实验,通过对软回收碎片的宏观、微观分析,探讨金属柱壳爆炸膨胀断裂模式及机制,实验结果显示:(1)不同爆压下,TA2工业纯钛柱壳外爆碎裂虽然均为剪切断裂模式,但其断裂机理不同;在较低爆压作用下,发生微孔洞演化、连接的剪切断裂;而在较高爆压下,为多重绝热剪切控制的断裂机制。(2)在爆炸作用下,TA2钛柱壳高速变形、断裂过程发生α→β动态相变,随后在稀疏波作用下快速冷却,试样内表面组织转变为一定取向的板条马氏体,晶粒明显大于原始尺寸。因此,对于柱壳外爆碎裂特性及机理分析,须考虑材料在爆轰波作用下金属材料的动态相变的影响,研究为柱壳断裂存在多种断裂模式及碎裂分析提供了参考。

    Abstract:

    Explosively driven fragmentation of ductile metals cylinders is a highly complex phenomenon, which is involved to many kinds of competition and coupling of fracture modes and was of interest to researchers. In this paper, the fragmentation experiments of TA2 industrial pure titanium cylindrical shell with varying charge were carried out. Through the analysis of macroscopic fracture and microscopic metallographic for the recovered fragments, the fracture mode and mechanism explosively fragmentation of TA2 metal are discussed. As the results shown that: (1) Though all of the TA2 alloy fragments failure with shear mode in explosive-driven cylinders expansion tests, the failure mechanisms of shear mode is different for tests with different explosion pressures. It is observed that the shear failure caused by the evolution of micro-voids in tests with relatively low pressure but controlled by multiple adiabatic shear localization in tests with relatively high pressure. (2) The microscopic metallography shows that the dynamic phase transition of α→β may occur during the high-speed deformation of the TA2. It is shown that the microstructure of the inner surface is converted to lath martensite with a specific orientation and the resulted grain size is apparently larger than the as-received. Thus, it is necessary to consider the influence of the dynamic phase transition of material under shock waves when analyze the fracture characteristics and mechanisms of external explosive experiments. This work can provide a significant reference to the analysis of multiple failure modes of cylinders under external explosion loading conditions.

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庞振,董新龙,吴文苍,付应乾,吴思思. TA2钛金属柱壳外爆绝热剪切碎裂及微观组织演化[J].稀有金属材料与工程,2021,50(12):4334~4341.[Pang Zhen, Dong Xinlong, Wu Wencang, Fu Yingqian, Wu Sisi. Multiple adiabatic shear fragmentation and microstructure evolution of Explosive-driven TA2 pure titanium cylinders[J]. Rare Metal Materials and Engineering,2021,50(12):4334~4341.]
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历史
  • 收稿日期:2021-01-06
  • 最后修改日期:2021-03-04
  • 录用日期:2021-03-22
  • 在线发布日期: 2022-01-09
  • 出版日期: 2021-12-24