| Title |
Temperature Dependency of the Tensile Characteristics and Transition of Fracture Behaviors in a Novel Infiltrated TiC-SKD11 Composites |
| Authors |
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) |
| DOI |
https://doi.org/10.3365/KJMM.2017.55.3.156 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
composites; infiltration; interfaces; transmission electron microscopy (TEM); tensile test |
| 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) |