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The mechanism of crack generation and propagation in the new casting alloy GH4151 during cogging

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Abstract

Based on the crack phenomena observed in an actual cogging experiment of the new as-cast GH4151 alloy, the mechanism of crack generation and propagation during cogging was studied by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results reveal that there were massive and spherical precipitates at the original grain boundary, large-scale holes at the edge of the precipitates and other areas, tiny pores near the grain boundary, and secondary microcracks along the grain boundary. These phenomena all promoted the generation and propagation of cracks. The fracture surface of the crack was determined as intergranular fracture, and local cleavage fracture was found to occur at the grain intersection. Moreover, the strain energy concentration at the grain boundary was evident, and the deformation of billets was found to primarily depend on grain boundary slip and grain rotation.

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Funding

Zhi Jia would like to gratefully acknowledge the support of the Open Project of Science and Technology on Advanced High Temperature Structural Materials Laboratory (No. 6142903200206), Science Foundation for Distinguished Young Scholars of Gansu Province (No. 18JR3RA134), and Lanzhou University of Technology Support Plan for Excellent Young Scholars (No. CGZH001).

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Authors and Affiliations

  1. School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu Province, China

    Zhi Jia, Baolin Wei & Yutian Ding

  2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Qilihe District, Lanzhou, 730050, Gansu Province, People’s Republic of China

    Zhi Jia

  3. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, 100094, China

    Chonglin Jia

  4. Jinchuan Group ltd, Jinchang, Gansu Province, China

    Yan Yang, Dekui Ling & Hanfeng Chen

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  1. Zhi Jia
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  2. Baolin Wei
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All the authors participated in and agreed to publish this article, and provided a lot of help in the process of writing this article.

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Correspondence to Zhi Jia.

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Jia, Z., Wei, B., Jia, C. et al. The mechanism of crack generation and propagation in the new casting alloy GH4151 during cogging. Int J Adv Manuf Technol 116, 2455–2465 (2021). https://doi.org/10.1007/s00170-021-07609-y

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