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在三代非能动压水堆核电设备控制棒驱动机构中,首次使用了Stellite6合金作为钩爪铸件材料。该材料是一种可耐各类腐蚀以及高温氧化的硬质合金,具有很好的耐磨损性能。由于钴基合金铸件在浇注冷却过程中极易开裂,因此在冷却过程中应采用缓冷的工艺,以减少铸件的内应力。考虑到Stellite6合金的这些特性和及其使用条件,选取了两种工艺方案进行研制。通过对两种工艺方案结果的分析,获得了较好的Stellite6合金铸件的制造工艺。
For the first time, Stellite 6 alloy was used as the claw casting material in the control rod drive mechanism of NPP nuclear power plant of the third generation. The material is resistant to all types of corrosion and high temperature oxidation of hard metal, with good wear resistance. As the cobalt-based alloy castings in the casting cooling process is very easy to crack, so in the cooling process should be slow cooling process to reduce the internal stress of the casting. Taking into account these characteristics of Stellite6 alloy and its conditions of use, two processes were selected for development. Through the analysis of the results of the two process schemes, a better manufacturing process of Stellite6 alloy castings is obtained.