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Effect of Long-Term Thermal Exposures on Tensile Behaviors of K416B Nickel-Based Superalloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effect of long-term thermal exposure on the tensile behavior of a high W content nickel-based superalloy K416B was investigated. The microstructure and the deformation characteristics were observed by scanning electron microscopy and transmission electron microscopy, and the phase transformation of the alloy during long-term thermal exposure was analyzed by X-ray diffraction patterns and differential thermal analysis. Results showed that after thermal exposure at 1000 °C, the MC carbides in the K416B alloy decomposed into M6C. During tensile deformation, dislocations slipping in γ matrix crossed over the M6C by Orowan bowing mechanism. With the increase of thermal exposure time, the secondary M6C reduced greatly the yield strength of the alloy at room temperature. Meanwhile, the continuous distribution of the secondary M6C with great brittleness in the grain boundary could become the main source of crack, which might change the fracture characteristic of the alloy from trans-granular to intergranular.

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Acknowledgements

This work was financially supported by the National Basic Research Program of China (Nos. 2010CB631200 and 2010CB631206), the National Natural Science Foundation of China (Nos. 51701212, 50931004, 51571196, 51601192 and 51671188), the State Key Laboratory of Solidification Processing in NWPU (SKLSP201747) and the Liaoning Provincial Natural Science Foundation of China (No. 2019-MS-336)

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Mao-Kai Chen, Jun Xie, De-Long Shu, Gui-Chen Hou, Shu-Ling Xun, Jin-Jiang Yu, Xiao-Feng Sun & Yi-Zhou Zhou

  2. Shenyang University of Technology, Shenyang, 110870, China

    Mao-Kai Chen & Li-Rong Liu

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  1. Mao-Kai Chen
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  2. Jun Xie
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Correspondence to Jun Xie.

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Chen, MK., Xie, J., Shu, DL. et al. Effect of Long-Term Thermal Exposures on Tensile Behaviors of K416B Nickel-Based Superalloy. Acta Metall. Sin. (Engl. Lett.) 33, 1699–1708 (2020). https://doi.org/10.1007/s40195-020-01075-3

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