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本文研究了热处理因素对W+Mo含量达12％的10Cr—15Co—Ni基高温合金弯曲晶界形成的影响。指出在固溶处理后以1—10℃/分冷却和固溶处理后空冷至1020—1130℃并在这一温度范围保温一定时间均可获得弯曲晶界。 在弯曲晶界上同时并存有参与热处理过程的两种性质不同的r′和M_bC型碳化物相,M_bC型碳化物的生核并迅速长大是该类型合金引起晶界弯曲的主导因素,这一观点与传统的看法即在高合金化Ni基合金中r′相的不连续沉淀引起晶界弯曲是截然不同的。 同时提出了在该类型合金中弯曲晶界形成的模型以及讨论了弯曲晶界形成的机理。
In this paper, the effect of heat treatment on the formation of bending grain boundaries in 10Cr-15Co-Ni based superalloys with W + Mo content of 12% was investigated. It is pointed out that after the solution treatment, cooling and solution treatment at 1-10 ℃ / min and then air cooling to 1020-1130 ℃, bending grain boundaries can be obtained in a certain time during this temperature range. At the same time, there are two types of r ’and M_bC carbide phases that are involved in the heat treatment at the same time in the grain boundary. The nucleation and rapid growth of M_bC type carbide are the dominant factors that cause grain boundary bending in this type of alloy. One point of view and the traditional view that the discontinuous precipitation of the r ’phase in a highly alloyed Ni-based alloy causes very different grain boundary bending. At the same time, a model of the formation of the bending grain boundaries in this type of alloy is proposed and the mechanism of the formation of the bending grain boundaries is also discussed.