| Title |
Crack Initiation and Propagation Behavior of a Two - Layer Hardfaced Armor Plate after Ballistic Impact |
| Authors |
이성학(Sunghak Lee); 추성훈(Seong - Hun Choo); 백응율(Eung - Ryul Baek) |
| Abstract |
The objective of this study is to investigate microstructural characteristics of a two-layer hardfaced armor plate after ballistic impact. In order to deaelop the newly-designed armor plate, high hardness, hypereutectic high Cr white iron and ductile SUS 309 stainless steel were hardfaced nn an HY l00 steel plate using self-shielding flux cored arc welding method. This hardfaced plate was ballistically impacted, and metallurgical observations of the area near the perforated region were conducted. The high Cr white iron hardfaced layer was obseved to block effectively a fast traveling prajectile, although microcracks were initiated at coarse primary carbides of the high Cr hardfaced layer, and propagated to form longer cracks However, very few cracks were found in the stainless steel hardfaced layer, which tended to hinder the propagating crack. These foundings suggest that ballistic performance of the multi-layered armor plates fabricated by hardfacing technique might be improved. |