Ballistic impact behavior of multilayered armor plates processed by hardfacing
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Ballistic Impact Behavior of Multilayered Armor Plates Processed by Hardfacing SEONG-HUN CHOO, EUNG-RYUL BAEK, and SUNGHAK LEE Hardfacing is a type of surface treatment for the extension of service life of worn parts or structures and the improvement of the surface properties through deposition of the alloys using arc welding or laser cladding.V.2] Among the hardfacing alloys, the high chromium hardfacing alloys have been used most extensively for dies or parts in various industrial areas because of their excellent hardness, corrosion resistance, and wear resistance as well as inexpensiveness. t241 These properties are obtained from the large volume fraction of hard chromium carbides, t3-81 The recent works on these alloys have focused on the property enhancement, the microstructural modification, and the hightemperature applicationY ,7.8] Recently, the hardfacing has been applied to processing of multilayered armor plates since it provides excellent properties, fabricability, and weldability.[31 In fact, the multilayered hardfacing to various thickness and to various combination of hardfacing materials or hardfacing sequences can be readily achieved for potential armor plates. There is, however, only limited information available on the processing of multilayered armor plates, their evaluation of ballistic performance, and fracture behavior under ballistic impact loading condition. Furthermore, the correlation between microstructure, processing, fracture behavior, and ballistic property has not yet been investigated in detail. The aim of the present study is to elucidate a more fundamental understanding of how fracture occurs in multilayered armor plates upon ballistic impact. Two armor plates were processed by the hardfacing of a hypereutectic high chromium white iron alloy and a stainless steel. One of these plates was hardfaced only with the high chromium white iron alloy, and the other was made by the additional welding with the stainless steel on the former hardfaced plate. The purpose of using these hardfacing treatments was to allow a comparative study of different combinations of hardfacing layers, hardness, and microstructure. In order to obtain a proper perspective on the effects of processing and microstructure on fracture under ballistic condition, ballistic impact tests were conducted on these two plates, and their ballistic properties were characterized in detail by the microstructural observation of the target specimens after ballistic testing. The role of cracking in the hardfaced layers was brought into focus in some aspect of absorbing impact energy, and its importance in ballistic property was examined. The hardfacing materials were a hypereutectic high chro-
SEONG-HUN CHOO, Research Assistant, and SUNGHAK LEE, Associate Professor, are with the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790784, Korea. EUNG-RYUL BAEK, Senior Researcher, is with the Structure Metals Team, Advanced Materials Division, Research Institute of Industrial Science and T
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