氧化物弥散相的分布对ODS镍基合金高温持久性能的影响

Effect of Oxide Dispersoid Distribution on Elevated Temperature Rupture Property of a Nickel-Based Superalloy

通过光学金相、透射电镜及电子探针等方法研究了氧化钇弥散相的分布对ＭＧＨ－７５４合金高温持久性能的影响。结果表明，由于ＭＡ（ＭｅｃｈａｎｉｃａｌＡｌｌｏｙｉｎｇ）工艺不完善，使合金中存在氧化钇弥散相的不均匀分布，导致细晶的产生并促进沿晶孔洞的生核及长大。通过改进ＭＡ工艺可有效地改善合金中弥散相的分布，提高合金高温持久性能。

The effect of yttrium oxide dispersoid distribution on the 980℃ rupture life of an ODS nickel-based superalloy MGH 754 was investigated.The block accumulation of oxide dispersoid because of being not complete of MA process results in cavity production on grain boundaries. By improving MA process , the block accumulation of oxide dispersoid can be eliminated and the high temperature rupture property can be improved.