氧含量对Ni-30Cr-1Cu镍基合金热加工性能的影响

Effect of Oxygen on Hot-working Properties of Ni-30Cr-lCu Superalloy

采用小锭试验研究了氧含量对Ni-30Cr-1Cu镍基合金热加工性能的影响以及Cu在 合金相中的分布。结果表明,氧含量为0．0077％和0．015 8％的试验合金,其热加工性能显 著恶化,在1050℃和1 200℃加热后,变形量小于10％时,即在晶界普遍萌生裂纹,并沿晶界 迅速扩展。氧含量为0．003 3％的试验合金,在1 050℃和1 200℃的加热温度和900℃左右的 终锻条件下,均具有良好的热加工性能,一火变形量高达80％以上,仍未出现热加工缺陷。Cu 只明显富集于热加工完毕空冷过程中在晶内晶界析出的M23C6中,未观察到其对热加工性能 有明显的恶化作用。在正常工业生产中,采取措施把该合金氧含量控制在较低的范围内,解决 了该合金热加工成形问题,取得了良好效果。

The effect of oxygen content on hot-working properties and distribution of copper in Ni-30Cr-1Cu,a kind of superalloy,has been investigated with small ingots. The hot-working properties of alloys with 0. 007 7% and 0. 015 8% oxygen content respectively were obviously worsened. When they were heated up to 1 050℃ and 1 200℃ and the deformation is less than 10% , many cracks formed and spread quickly along grain boundaries. The alloy with 0. 003 3% oxygen content has good hot-working properties when it is heated up to 1 050℃ and 1 200℃ with finish forging temperature 900℃. No hot-working defects appear when the deformation in one heat reaches more than 80%. Experimental results show that copper is only concentrated in M23 C6 phase at grain boundaries and in grains. No obvious deterioration of its hot-working properties has been observed. In the normal production, measures are taken to control the alloy ＇ s oxygen content within lower limits so as to solve its formation problem during the heat treatment.