Chin. Phys. Lett.  2018, Vol. 35 Issue (1): 018101    DOI: 10.1088/0256-307X/35/1/018101
Deformation and Spallation of Explosive Welded Steels under Gas Gun Shock Loading
Ying Yu1,2,3, Chao Li2,3**, Hong-Hao Ma4, Mei-Lan Qi1**, Sheng-Nian Luo2,3**
1School of Science, Wuhan University of Technology, Wuhan 430070
2Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031
3The Peac Institute of Multiscale Sciences, Chengdu 610207
4CAS Key Laboratory of Materials Behavior and Design, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027
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Abstract We investigate deformation and spallation of explosive welded bi-steel plates under gas gun shock loading. Free surface histories are measured to obtain the Hugoniot elastic limit and spall strengths at different impact velocities. Pre- and post-shock microstructures are characterized with optical metallography, scanning electron microscopy, and electron backscatter diffraction. In addition, the Vickers hardness test is conducted. Explosive welding can result in a wavy steel/steel interface, an ultrafine grain region centered at the interface, and a neighboring high deformation region, accompanied by a hardness with the highest value at the interface. Additional shock compression induces a further increase in hardness, and shock-induced deformation occurs in the form of twinning and dislocation slip and depends on the local substructure. Spall damage nucleates and propagates along the ultrafine grain region, due to the initial cracks or weak interface bonding. Spall strengths of bimetal plates can be higher than its constituents. Plate impact offers a promising method for improving explosive welding.
Received: 25 September 2017      Published: 17 December 2017
PACS:  81.05.Bx (Metals, semimetals, and alloys)  
  81.20.Vj (Joining; welding)  
  81.70.Bt (Mechanical testing, impact tests, static and dynamic loads)  
  62.20.F- (Deformation and plasticity)  
Fund: Supported by the National Basic Research Program of China under Grant No 2014CB845904, and the National Natural Science Foundation of China under Grant Nos 11627901, 11372113 and 11672110.
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Ying Yu, Chao Li, Hong-Hao Ma et al  2018 Chin. Phys. Lett. 35 018101
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Ying Yu
Chao Li
Hong-Hao Ma
Mei-Lan Qi
Sheng-Nian Luo
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