深冷处理过程中Inconel 617合金的微观组织演变

Microstructure Evolution of Inconel 617 Alloy During Subzero Treatment

摘要:

研究了Inconel 617合金在不同深冷处理时间和次数条件下微观组织的演变规律。结果表明，深冷处理对Inconel 617合金的微观组织结构有很大的影响，随着深冷处理时间的延长，晶粒尺寸减小，但是随着深冷处理次数的增加，晶粒尺寸又增大，并且细化晶粒的晶界处具有高的应力。晶格常数与晶粒尺寸的变化相反。深冷处理试样析出了MC、M₆C、M₂₃C₆的简单和复杂碳化物，导致了位错的塞积。深冷处理24 h后试样的几何必须位错（GND）密度增大，当24 h循环处理2次后，GND密度显著降低。此外，深冷处理导致Inconel 617合金的旋转立方织构和旋转铜织构转变为黄铜织构、P织构、高斯织构。

Abstract:

The relationship of microstructure evolution with subzero treatment time and number of Inconel 617 alloy was studied. The results indicate that subzero treatment has an obvious influence on the microstructure of Inconel 617 alloy. With the increase in subzero treatment time, the grain size decreases. With the increase in subzero treatment number, the grain size increases gradually, and the high stress is retained at the boundaries of the refined grains. The lattice constant varies inversely with the grain size. The simple and complex carbides of MC, M₆C and M₂₃C₆ are precipitated from the samples after subzero treatment, which leads to the accumulation of dislocations. The geometrically necessary dislocation density of the samples increases after subzero treatment for 24 h, and decreases significantly with two times of subzero treatment for 24 h. In addition, after subzero treatment, the rotated cube texture and rotated copper texture transform to brass texture, P texture and goss texture.