锻压技术

Inconel 617镍基合金冷轧变形后晶界分布特征研究

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

单位：1. 上海电机学院机械学院 2. 中国科学院金属研究所 3. 浙江联大锻压有限公司

分类号：TG161

出版年,卷(期):页码：2023,48(12):182-186

摘要：

Inconel 617合金是一种Ni-Cr-Co-Mo强化的镍基高温合金。以Inconel 617合金为研究对象，采用电子背散射衍射技术分析其冷轧变形后的晶界分布特征。结果表明：通过15%冷轧变形，随后在1200 ℃保温1 h，再以5 ℃·min-1的冷却速度冷却至700 ℃保温8 h后取出水冷的形变退火控冷热处理工艺，可在合金中获得70%以上的Σ3n晶界，同时将剩余部分平直随机晶界转变为锯齿晶界。其中，Σ3、Σ9和Σ27晶界的比例分别为63.6%、4.5%和2.3%，锯齿晶界的平均振幅为0.72 μm。协同引入两类特殊晶界，将进一步提高特殊三叉晶界的比例，为改善材料性能提供了新的思路,并揭示了Inconel 617合金锯齿晶界的形成与晶界析出的间断分布的Mo6C和Cr23C6型碳化物钉扎晶界有关。

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.

基金项目：

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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