Transactions of Materials and Heat Treatment

Title：Effect of controlled cooling treatment on grain boundary structure for forged Inconel 617 alloy

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ClassificationCode：TG156.9

year,vol(issue):pagenumber：2023,48(10):38-45

Abstract：

For forged Inconel 617 alloy, the serrated grain boundary was introduced into the alloy by controlled cooling treatment to eliminate residual internal stress and achieve structural optimization, and the influences of cooling speed on serrated grain boundaries were analyzed. Then, the types and structural characteristics of carbides at grain boundary were revealed, and the formation reasons of serrated grain boundary were clarified. The results show that the controlled cooling treatment is a necessary step to obtain serrated grain boundaries, and the slower the cooling speed is, the more conducive to formation of serrated grain boundaries. By holding the alloy at 1200 ℃ for 1 h, cooling it to 700 ℃ at a cooling speed of 5 ℃·min-1, and then water cooling, the serrated grain boundaries can be introduced into the alloy, where the average amplitude of the serrated grain boundaries is 0.8 μm. In addition, the formation of serrated grain boundaries is closely related to the carbides at grain boundary, which are mainly manifested by two different formation mechanisms. One is that part of the grain boundary is pinned by carbides, and the grain boundaries between carbides migrate to form serrated grain boundaries. The other is the growth of plate-shaped carbides along the grain boundaries to induce bending of the grain boundaries.

Funds：

上海市“科技创新行动计划”自然科学基金资助项目(21ZR1424600)；上海市科委地方院校能力建设三年行动计划(23010500800，21010500800)

曹峰华(1985-)，男，硕士，实验员 E-mail：383329008@163.com

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