Microstructure evolution and crack propagation feature in thermal fatigue of laser-deposited STELLITE (cas 12638-07-2) 6 coating for brake discs

Add time:07/20/2019    Source:sciencedirect.com

In order to reveal the mechanism of microstructure evolution and crack propagation in laser-deposited STELLITE (cas 12638-07-2) 6 alloys, a quenching thermal fatigue test was conducted. Various detection methods were applied to observe differences between the coatings as deposited and after thermal fatigue. The results showed that the γ → ε martensitic transformation occurred in the as-deposited γ-Co matrix during the thermal fatigue process, driven by a fast cooling and thermal stress. The generated ε-Co phase presented variant selection, obeying Schmidt's law. In the ε-Co phase, the slip activity derived from different 111γ112¯γ slipping systems that produced stacking faults and planar defects during the phase transformation. In addition, the stacking faults on {1 1 1}γ planes promoted the precipitation of directional M7C3 fine particle carbides. The net-like eutectic structures and γ/ε interfaces acted as paths for thermal crack propagation.

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