TY - GEN
T1 - Effect of cryogenic treatment on improving the fracture toughness of TiN coated cemented carbide
AU - Nie, Chaoyin
AU - Deng, Ya
AU - Ding, Ying
AU - Li, Ning
AU - Zhou, Xiaogang
AU - Wei, Lidan
PY - 2012
Y1 - 2012
N2 - The 2μm thick TiN coatings were deposited by arc ion plating on YW2 cemented carbide substrate, and the system of TiN/YW2 was treated with cryogenic treatment at -196°C for 30 hours. The change of the Rockwell indentation's morphology of the system (the form and density of cracks, the spalling state of the coating)before and after the treatment were investigated by means of the Rockwell hardness tester. With metallurgical microscope and SEM, the change of the microstructure of the substrate and its influence on the fracture toughness of the system were investigated. The results show that after the treatment, the density of the radiated cracks in the substrate were obviously reduced, but the main cracks hadn't any change, the spalling of the TiN coating along the indentation was lightened. After the cryogenic treatment the dispersed granular γ phase obviously decreased or even disappeared, the pores became smaller and the microstructure of YW2 became more compact, and the microcracks were merged during the cryogenic treatment. These are beneficial to improve the fracture toughness of YW2 substrate and the coating/substrate system.
AB - The 2μm thick TiN coatings were deposited by arc ion plating on YW2 cemented carbide substrate, and the system of TiN/YW2 was treated with cryogenic treatment at -196°C for 30 hours. The change of the Rockwell indentation's morphology of the system (the form and density of cracks, the spalling state of the coating)before and after the treatment were investigated by means of the Rockwell hardness tester. With metallurgical microscope and SEM, the change of the microstructure of the substrate and its influence on the fracture toughness of the system were investigated. The results show that after the treatment, the density of the radiated cracks in the substrate were obviously reduced, but the main cracks hadn't any change, the spalling of the TiN coating along the indentation was lightened. After the cryogenic treatment the dispersed granular γ phase obviously decreased or even disappeared, the pores became smaller and the microstructure of YW2 became more compact, and the microcracks were merged during the cryogenic treatment. These are beneficial to improve the fracture toughness of YW2 substrate and the coating/substrate system.
KW - Arc ion plating
KW - Cryogenic treatment
KW - Fracture toughness
KW - Rockwell indentation
KW - TiN coating
UR - http://www.scopus.com/inward/record.url?scp=84255184620&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.415-417.1903
DO - 10.4028/www.scientific.net/AMR.415-417.1903
M3 - Conference contribution
AN - SCOPUS:84255184620
SN - 9783037853252
T3 - Advanced Materials Research
SP - 1903
EP - 1910
BT - Advanced Materials
T2 - 2nd International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2011
Y2 - 16 December 2011 through 18 December 2011
ER -