RETRACTED: Evaluation of Thermal Shock Resistance of Ti(C,N)-Mo2C-Ni Cermet by Infrared Radiation Heating Method (Retracted Article)

초록

An attempt was made to evaluate the thermal shock resistance of Ti(C,N)-Mo2C-Ni cermets by the infrared radiation heating method. The method uses a thin circular disk that is heated by an infrared ray at the central area with a constant heat flux. The technique makes it possible to evaluate the thermal shock strength (T-ss) and thermal shock fracture toughness (T-sf) directly from the electric powder charge and the time of fracture despite the fact that T-ss and T-sf consist of the thermal properties of the material tested. T-sf could be measured for specimens with an edge notch, while T-ss could not be measured for the specimens without the notch. It was thought, however, that T-sf might depend on the radius of curvature of the edge notch. Using the data of T-sf, T-ss, was calculated from the consideration of stress concentration. As a result, it was considered that T-ss, could be applied to the evaluation of the thermal shock resistance of cermet, and the thermal shock resistance of Ti(C,N)-Mo2C-Ni cermets increased with an increase in the content of nitrogen and Ni.

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