NiMnCo触媒合金热轧开裂分析

Hot-rolled crack of NiMnCo catalyst alloy

对NiMnCo触媒合金加工过程中存在的热轧开裂问题作了研究。结果表明 :NiMnCo合金的热轧开裂为晶间断裂 ,裂纹沿晶界扩展。造成合金热塑性降低的原因是溶质 (杂质 )原子在晶界的偏析以及第二相夹杂物的存在。通过原材料处理及强化合金熔炼工艺可消除热轧裂纹的产生。

The hot-crack of NiMnCo catalyst alloy was investigated by SEM and EPA techniques. The hot-crack of NiMnCo alloy is a intercrystalline failure, it forms and spreads in grain boundaries. The segregation of solute atom in grain-boundaries and inclusions in alloy (solvent) were responsible for decrement in hot ductility (plasticity) of NiMnCo catalyst. It is very important that the raw materials were treated and alloy melting processes were enhanced to restrain NiMnCo catalyst alloy from split.