93W杆式弹超高速撞击多层Q345钢靶毁伤及微观分析

李名锐; 冯娜; 蔡青山; 陈春林; 马坤; 尹立新; 周刚

doi:10.11883/bzycj-2020-0303

93W杆式弹超高速撞击多层Q345钢靶毁伤及微观分析

doi: 10.11883/bzycj-2020-0303

李名锐^1,,
冯娜^{1, 2},
蔡青山³,
陈春林¹,
马坤¹,
尹立新¹,
周刚^1, ,

1.
西北核技术研究所，陕西西安 710024
2.
北京理工大学材料学院，北京 100081
3.
中南大学粉末冶金国家重点实验室，湖南长沙 410083

基金项目: 国家自然科学基金（11402213, 11772269）

详细信息

作者简介:
李名锐（1983－　），男，博士，副研究员，fengna@nint.ac.cn

通讯作者:
周　刚（1964－　），男，博士，研究员，博士生导师，gzhou@nint.ac.cn

中图分类号: O385
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- 文章访问数: 513
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- 被引次数: 0
出版历程
- 收稿日期: 2020-08-27
- 修回日期: 2020-12-30
- 网络出版日期: 2021-02-02
- 刊出日期: 2021-02-05

Damage of a multi-layer Q345 target under hypervelocity impact of a rod-shaped 93W projectile

LI Mingrui^1
,,
FENG Na^{1, 2},
CAI Qingshan³,
CHEN Chunlin¹,
MA Kun¹,
YIN Lixin¹,
ZHOU Gang^{1
, ,}

1.
Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China
2.
School of Materials Science and Engineer, Beijing Institute of Technology, Beijing 100081, China
3.
State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, Hunan, China

摘要

摘要: 为了解杆式弹超高速撞击多层薄钢靶的破坏过程及毁伤机理，开展了克级93W杆式弹正撞击多层Q345钢靶实验及数值模拟研究，通过扫描电子显微镜（scanning electron microscope，SEM）及金相显微镜，分析了超高速撞击实验后靶板材料的微观组织及成分。结果表明，超高速撞击作用下，靶板呈现出“翻唇”穿孔变形、花瓣状塑性变形、撕裂、撞击成坑及鼓包等破坏模式。靶板前3层毁伤以超高速穿孔为主，孔洞数目多但面积小，后几层靶板毁伤孔洞数目少且孔径呈先增大后减小趋势。微观分析表明靶材在强冲击压力下发生晶粒碎化、熔化及再结晶，撞击过程中会形成微孔聚集与微裂纹，可见靶板失效主要是熔融混合物冷却过程中产生的热应力与切应力下的剪切撕裂综合作用的结果。
- 93W /
- 杆式弹 /
- 多层Q345靶 /
- 微观分析 /
- 毁伤模式
Abstract: In order to research the penetration characteristics and damage mechanism of multi-layer targets under hypervelocity impact, experiments and numerical simulations were carried out on a rod-shaped 93W projectile impacting a multi-layer Q345 steel target. A gram-order rod-shaped 93W projectile together with a sabot was launched by a 57/10 mm two-stage light gas gun to penetrate into a ten-layer Q345 target. The damage photos of the target after penetration were transformed into binary images by a Matlab processing software. The equivalent diameter of the center hole, the number and total areas of the holes, the diameters of damage circles of the ten-layer target were summed up and analyzed. The AUTODYN software was used to perform the smoothed particle hydrodynamics simulation. Then the microscopical data of the target plates were obtained by scanning electron microscopy (SEM) and optical microscopy to analyze the microstructure and element composition. Results show that a rod-shaped 93W projectile could penetrate 8 or 9 layers of a ten-layer Q345 target under different initial impact velocities. Perforated lips, petal-shaped plastic deformation, tearing, cratering and bulging were formed in target plates. These failure modes are attributed to plastic expanding failure and shear tearing under shear stress. The damage mode of the first three layers of the target is dominated by hypervelocity perforation due to the high impact velocity, with many holes but small area, while the holes in the later layers are few, but the diameter increases first and then decreases as the masses and velocities of fragments decrease. The simulation results were verified by the experimental results. They are in good agreement with the experimental results. Micro analysis shows that the materials of the target and projectile are melt, while the grains are broken up, refined, melt and recrystallized in the target plates. There are aggregated micropores and microcracks formed during the penetration process. The micro analysis results show that the damage failure is mainly caused by the combined effects of thermal stress during the cooling process of the molten mixture and shear tearing under the shear stress, which is consistent with the macro-scopical results.
- 93W /
- rod-shaped projectile /
- multi-layer Q345 target /
- micro analysis /
- damage mode

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图 1 实验1中10层靶板各层正面的毁伤

Figure 1. Damage at the front face of each layer of a ten-layer target in experiment 1

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图 2 实验2中10层靶板各层正面的毁伤

Figure 2. Damage at the front face of each layer of a ten-layer target in experiment 2

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图 3 实验2中10层靶板各层背面的毁伤

Figure 3. Damage at the back face of each layer of a ten-layer target in experiment 2

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图 4 实验2中10层靶板各层毁伤侧视图（图中标尺均为5 mm）

Figure 4. Side view of damage in each layer of a ten-layer target in experiment 2 (the scale bars all represent 5 mm)

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图 5 实验后10层靶板各层的孔洞数目、中心孔等效直径、穿孔毁伤总面积及毁伤范围覆盖圆直径

Figure 5. Equivalent diameter of center hole, number and total areas of holes, diameter of damage circle in each layer of ten-layer targets after experiments

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图 6 93W弹体以2.76 km/s的速度撞击3层靶的数值模拟过程（0～0.1 ms，间隔0.01 ms）

Figure 6. A numerically simulated sequence for the penetration process of a rod-shaped 93W projectile with the initial velocity of 2.76 km/s into a three-layer Q345 target from 0 to 0.1 ms at the time interval of 0.01 ms

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图 7 数值模拟得到的3层Q345钢靶各层毁伤情况

Figure 7. Numerically-simulated damage in each layer of the three-layer Q345 steel target

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图 8 首层“翻唇”穿孔断面扫描电镜图像

Figure 8. Scanning electron microscope images for cross-sections of perforated lips on the first layer

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图 9 首层靶板表面穿孔周围扫描电镜图像

Figure 9. Scanning electron microscope image along the radial direction around the perforated hole in the first layer

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图 10 首层靶板表面穿孔周围金相图（（a）→（f）：从弹孔边缘到远离弹孔）

Figure 10. Metallographic images along the radial direction around the perforated hole in the first layer ((a)→(f): from the edge of the perforated hole to away from the perforated hole)

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图 11 $ \varnothing $3.45 mm、长径比3的杆式弹脱壳后以3 km/s速度撞击6层Q235板各层SEM断口形貌

Figure 11. SEM fracture morphology of a six-layer Q235 target under the 3 km/s impact of a rod-shaped projectile with the diameter of 3.45 mm and the aspect ratio of 3

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图 12 靶板2-7花瓣穿孔形貌SEM图

Figure 12. SEM images of the perforation in the 7th layer of experiment 2

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图 13 靶板表面弹坑及坑附近区域无定形态物质SEM图及无定形态物质能量色散谱

Figure 13. SEM images of the craters at the surface of the target and amorphous material near the craters as well as their energy dispersive spectra

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表 1 93钨合金的状态方程、强度模型材料参数

Table 1. Parameters of the equation of state and the strength model for 93W alloy

ρ_W0/(g·cm⁻³)	c_W0/(km·s⁻¹)	s_W	γ_W0	G_W0/GPa	Y_W0/GPa	Y_W,max/GPa	β	n′	$\dfrac{{{\rm{d}}{G_{\rm{W}}}}}{{{\rm{d}}p}}$	$\dfrac{{{\rm{d}}{G_{\rm{W}}}}}{{{\rm{d}}T}}/{\rm{(MPa}}\cdot{{\rm{K}}^{{\rm{ - 1}}}}{\rm{)}}$	$\dfrac{ { {\rm{d} }Y} }{ { {\rm{d} }p} }$
17.6	4.04	1.23	1.67	132	1.4	6	1.3	0.1	1.794	−40	0.019 027

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表 2 Q345钢的状态方程、强度模型材料参数

Table 2. Parameters of the equation of state and the strength model for Q345 steel

ρ_s0/(g·cm⁻³)	c_s0/(m·s⁻¹)	s_s	γ_s0	A/MPa	B/MPa	n	C	m	T_m/K	${\dot \varepsilon _{ {\rm{s0} } } }$/s⁻¹
7.83	4 569	1.49	2.17	374	795.7	0.454 5	0.015 86	0.885 6	−1 795	0.001

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表 3 聚碳酸酯的状态方程、强度方程材料参数

Table 3. Parameters of the equation of state and the strength model for polycarbonate

ρ_PC,0/(g·cm⁻³)	c_PC,0/(m·s⁻¹)	s_PC	γ_PC,0	E/GPa	Y_PC,0 /MPa
1.2	1 933	2.65	0.61	1	80.6

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表 4 3层靶各层毁伤面主孔等效直径实验及模拟结果比较

Table 4. Experimental and simulated results of the equivalent diameter of the center hole in each layer of the three-layer Q345 steel target

层别	等效直径/mm		误差/%
层别	实验	模拟	误差/%
第1层	16.34	16.15	1.162
第2层	38.11	36.29	4.773
第3层	14.06	15.44	9.809

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表 5 第7层靶板中熔化后凝固的无定形态物质能量色散谱结果

Table 5. Energy dispersive spectrum analysis of amorphous material solidified after melting in the 7th layer

元素	质量分数/%	原子数分数/%	元素	质量分数/%	原子数分数/%
C	2.45	13.14	Ni	2.18	2.39
Fe	63.38	73.23	W	32.00	11.23

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表 6 撞击坑及孔洞熔化后凝固的无定形态物质EDS结果

Table 6. EDS analysis of amorphous material solidified after melting in impact crater and cavity

元素	质量分数/%	原子数分数/%	元素	质量分数/%	原子数分数/%
C	4.67	17.12	K	12.67	3.01
O	15.75	43.37	Fe	30.03	23.70
Na	0.78	1.49	W	44.94	10.77
Mo	1.17	0.54

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