摘要
叙述了改性纳米SiC粉剂在高铬铸铁A49合金上的应用,试验结果表明,改性纳米SiC粉剂能够提高A49的冲击韧性,而晶间腐蚀性下降。其原因是改性纳米SiC粉剂的纳米颗粒所产生的曲率效应,提高了铁水的过冷度,促进初生奥氏体的形核,细化了共晶碳化物晶粒,但高的过冷度致使初生奥氏体中的C、Cr偏析,减少了共晶团中C和Cr,因而降低了耐晶间腐蚀性能。
The article introduced the application of modified nanometre SIC power during manufacturing hi-chrome alloy A49. The experiment results showed that modified nanometre SiC powder improved the impact ductility of A49 and reduced intercrystalline corrosion.The curvature effect caused by nanopartiele increased the degree of supercooling of the iron melt, promoted the nucleation of primary austenite, refined euteetic carbide crystalline grain.High degree of super-cooling made element C and Cr segregate to reduce element C and Cr in euteetic cell,then reduced the capability of intererytalline corrosion resistance.
出处
《铸造设备与工艺》
2013年第5期14-17,共4页
Foundry Equipment & Technology
关键词
A4
冲击韧性
晶间腐蚀
曲率过冷
A49, impact ductility, intercrytalline corrosion, curvature super-cooling
