Transactions of Materials and Heat Treatment

Title：Study on grain boundary distribution characteristics for Inconel 617 Ni-based alloy after cold rolling deformation

Authors： Cao Fenghua1 Zhang Haojie1 Ma Guangcai2 Yu Mingliang3 Hu Honglei1

Unit： 1.School of Mechanical Engineering Shanghai Dianji University 2.Institute of Metal Research Chinese Academy of Sciences 3.Zhejiang Lianda Forging Co. Ltd.

KeyWords： Inconel 617 alloy Σ3n grain boundary serrated grain boundary trifurcated grain boundary carbide cold rolling deformation

ClassificationCode：TG161

year,vol(issue):pagenumber：2023,48(12):182-186

Abstract：

Inconel 617 alloy is a Ni-Cr-Co-Mo reinforced nickel-based high-temperature alloy. For Inconel 617 alloy, the grain boundary distribution characteristics after cold rolling deformation was analyzed by using electron backscatter diffraction (EBSD) technology. The results indicate that through the heat treatment process of deformation annealing and controlled cooling which has 15% cold rolling deformation, followed by holding at 1200 ℃ for 1 h, and then cooling to 700 ℃ at a cooling rate of 5 ℃·min-1 and holding for 8 h, and taking out for water cooling, more than 70% of Σ3n grain boundaries are obtained in the alloy, and the remaining straight random grain boundaries are transformed into serrated grain boundaries simultaneously. Among them, the proportions of Σ3, Σ9 and Σ27 grain boundaries are 63.6%, 4.5% and 2.3%, respectively, and the average amplitude of serrated grain boundaries is 0.72 μm. The collaborative introduction of two types of special grain boundaries further increases the proportion of special trifurcated grain boundaries and provides new ideas for improving the material properties. At the same time, it is revealed that the formation of serrated grain boundaries in Inconel 617 alloy is related to the pinning grain boundaries of Mo6C and Cr23C6 carbides with intermittent distribution which are precipitated at 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)

作者简介：曹峰华(1985-)，男，硕士，实验员 E-mail：383329008@163.com 通信作者：胡红磊(1990-)，男，博士，讲师 E-mail：huhl@sdju.edu.cn

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