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Effect of Hot Deformation Parameters on Grain Refinement of an As-Cast Ni-Based Superalloy

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Abstract

The grain refinement behavior in superalloys has been identified for a long time, while its exact underlying mechanism remains to be explored. In this study, transmission electron microscope and electron backscatter diffraction technique were employed to investigate the fundamental mechanism governing the process of grain refinement for as-cast superalloys GH4720LI. The results show that grain refinement highly depends on the distributions of γ′ precipitates. In γ + γ′ two-phase region, γ′ precipitates could promote the dislocation multiplication, hinder the dislocation motion and lead to the formation of high-density dislocation substructure. Hence, the sub-boundaries and high-angle grain boundaries (HABs) are formed resulting from the gradual transformation of the dislocation substructures. In this process, the new grains are developed by quasi-continuous dynamic recrystallization (quasi-CDRX) and discontinuous dynamic recrystallization (DDRX). In addition, strain rate has little influence on grain size and DRX behavior at high strain rate and low temperature. While in γ single-phase region, the dislocation within grains is partly consumed through continuous original boundary migration (COBM) at 0.01 s−1. Moreover, in some deformed grains which are expected to possess high dislocation density, new grains can be formed by DDRX. With the strain rate increasing, the process of COBM was suppressed while DDRX was promoted. Therefore, the main dynamic softening mechanism of alloy is DDRX under the high temperature and high strain rate.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Xinxu Li & Zhouhua Jiang

  2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Xinxu Li, Zhipeng Wan, Yong Zhang, Chonglin Jia, Tao Wang & Zhao Li

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  1. Xinxu Li
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  2. Zhouhua Jiang
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Correspondence to Zhouhua Jiang or Zhipeng Wan.

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Li, X., Jiang, Z., Wan, Z. et al. Effect of Hot Deformation Parameters on Grain Refinement of an As-Cast Ni-Based Superalloy. J. of Materi Eng and Perform 29, 6343–6354 (2020). https://doi.org/10.1007/s11665-020-05135-8

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