|
Vol.55, No.3, 156 ~ 165, 2017
|
| Title |
| Temperature Dependency of the Tensile Characteristics and Transition of Fracture Behaviors in a Novel Infiltrated TiC-SKD11 Composites |
| 오누리 Nu-ri Oh , 이상관 Sang-kwan Lee , 조승찬 Seung-chan Cho , 조일국 Il-guk Jo , 황금철 Keum-cheol Hwang , 김대하 Dae-ha Kim , 조영태 Young-tae Cho , 서동우 Dong-woo Suh , 홍현욱 Hyun-uk Hong |
|
|
|
| Abstract |
| A composite having 60 vol% of TiC particles was successfully fabricated by the infiltration of molten SKD11 tool steel into a TiC preform. The density of this composite was achieved to be 25% lighter than conventional steels. The penetration of the liquid metal reached geometrically complex regions without any interfacial flaws. The interface between the TiC and steel was semi-coherent nature and had a specific orientation relationship, i.e., [111]α-Fe//[001]TiC, (112)α-Fe//(220) TiCㆍTensile tests were conducted at 25, 700, 750 and 800 ℃. The composite exhibited the enhanced strength compared with the unreinforced SKD11, and its reinforcement was most effective at 800 ℃. The TiC particles were fractured preferentially along the {100} cleavage plane, which was responsible for the main fracture of the composite. However, at and above 750 ℃ debonding of the TiC interface began to occur. The tensile fracture and strengthening mechanisms are discussed in terms of the TiC/ matrix interface and dislocations. (Received June 10, 2016; Accepted August 30, 2016) |
|
|
| Key Words |
| composites, infiltration, interfaces, transmission electron microscopy (TEM), tensile test |
|
|
 |
|
