铸件表面合金化层性能研究

Study on the Properties of Alloyed Layer on the Casting Surface

针对采用水玻璃、树脂等作为粘结剂进行铸件表面合金化时,合金层中容易产生气孔、夹渣缺陷的问题,研究了一种铸件表面合金化新工艺,即加入一种YB成型剂将合金粉末压制成块的方法进行表面合金化,在铸钢ZG65Mn本体表面得到高含Cr、W等元素的合金化层。结果表明,通过消失模铸造工艺,使用YB成型剂较好地消除了水玻璃等粘结剂造成的气孔、夹渣,合金化层和本体之间实现了冶金结合;合金化层具有较好的耐磨性和耐热性能,加入WC后耐磨性可达本体材料的4.82倍,抗氧化性能提高50%左右,且合金化粉末压块放置操作简便、可靠。

The blow holes and slag inclusion are easily formed in the alloying layer if using water glass or resin as binder to alloy casting surface. In this investigation, an appropriate surface alloying process was studied, in which a YB molding impregnant instead of water glass or resin binder is used to alloy surface through pressing the alloy-powder into block. The alloyed layer with high chromium and tungsten was obtained on the surface of ZG65Mn steel . The results show that through V-EPC process, YB molding impregnant can obviously reduce the blow holes and slag inclusion formed by the addition of water glass, the metallurgical bonding can be obtained between the alloyed layer and substrate. The alloyed layer has good thermal and wear resistance. The wear resistance of alloyed layer with addition of WC is 4.82 times as high as substrate material, oxidation resistance is increased by around 50%, and the placement and operation of alloy-powder block is simple and reliable as well.