在表征ZTC4钛合金铸件污染层的基础上,分析了α污染层对ZTC4钛合金铸态试样冲击性能的影响情况.实验结果表明,α污染层主要是由钛液与铸型材料界面反应产生的,为粗大的α片层组织.α污染层的存在对ZTC4钛合金铸态试样冲击性能影响显著,当铸态试样含α污染层一侧受冲击时,冲击强度下降了近9％；而当铸态试样含α污染层一侧的背面受冲击时,冲击强度下降了近80％,α污染层严重恶化了ZTC4钛合金铸态试样的冲击性能.%The surface contamination layers of ZTC4 titanium castings were characterized and the effects of α layer existence on impact properties of ZTC4 titanium castings were investigated.The results show that the microstructure of α layer is coarse lamellar,which is generated due to the interface reaction between titanium liquid and mold materials.The α layer has great influence on the impact properties of ZTC4 titanium castings.By comparison with that of the casting sample without α layer,as the side with α layer in castings sample is impacted,the decrease of impact strength of the casting sample is about 9％,while the opposite side in castings sample is impacted,the decrease of impact strength of the casting sample is about 80％.That is,α layer does harm to impact properties of ZTC4 casting sample seriously.
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