Objective To investigate the fracture reasons of 51CrV4 ring band. Methods The fracture modes and the fail-ure reasons of 51CrV4 ring band were analyzed by means of chemical composition analysis, mechanical performance analy-sis, SEM analysis, microstructure and energy dispersive spectrum analysis. Results In the tension stress state for a long time, the initiation cracks were formed at inner surface edge of the 51CrV4 ring band. At the same time, under the synergy of cor-rosive medium and stress, the corrosion process was accelerated by S, corrosion product was accumulated, and the expansion of corrosion microcracks was accelerated, the SCC failure was caused finally. Conclusion The occurrence probability of SCC cracking could be greatly reduced by selecting material reasonably, improving the process design and protection tech-nology, controlling raw material composition and reducing stress level and environmental severity.
NETL
NSTL
万方数据
维普
