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题名: Effect of N content on microsegregation, microstructure and mechanical property of cast Ni-base superalloy K417G
作者: Gong, Li;  Chen, Bo;  Yang, Yaqian;  Du, Zhanhui;  Liu, Kui
发表日期: 2017-7-31
摘要: This study investigates the effects of nitrogen (N) content (0.0005-0.0045 wt%) on the microsegregation, microstructures and high temperature mechanical properties of cast superalloy K417G. The results show that the segregation of Ti to interdendritic region becomes very serious with increased N content. In all three samples with different N contents, the alloys are typically dendritic morphology and gamma' phases show good cubic structure. With the N content increasing from 0.0005 wt% to 0.0045 wt%, the volume fraction of gamma' phase in the dendrite decreases, the sizes of gamma/gamma' eutectic and MC carbide increase, and the volume fractions of gamma/gamma' eutectic, MC carbide and micro-porosity firstly increase but then decrease. N addition changes the morphology of MC carbide from script-like shape to blocky shape, and Ti(C, N) is identified in the alloy with 0.0045 wt% N. With the N content increasing, the ultimate and yield strength decrease at elevated temperature, and the ductile and stress rupture life firstly have a sharp decrease and then have a slight increase. The specimen with the minimal content of N shows the best comprehensive mechanical properties.
刊名: ELSEVIER SCIENCE SA
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Gong, Li,Chen, Bo,Yang, Yaqian,et al. Effect Of N Content On Microsegregation, Microstructure And Mechanical Property Of Cast Ni-base Superalloy K417g[J]. Elsevier Science Sa,2017,701:111-119.

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