Microstructure control and DRX characteristics of Ni–Co–W superalloys affected by changing deformation direction on [001] columnar grain

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-14 DOI:10.1016/j.jmrt.2024.09.110
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Abstract

Controlling the evolution process of columnar grains is benefits to achieve microstructure regulation during subsequent hot processing in superalloys. In present research, it takes a Ni–Co–W superalloy as an example, aims to clarify the underlying connections between the compression direction and dynamic recrystallization (DRX) behaviors in microstructure evolution. The compression direction (CD) was parallel or perpendicular to [001] columnar has been defined as CD∥[001] and CD⊥[001], respectively. The columnar evolution and DRX characteristics under two sets of experimental during hot deformation were identified deeply. The results show that complete DRX is more easily to occur when CD⊥[001], but fine DRX grains are tendency to form when CD∥[001]. DRX nucleation within CD∥[001] and CD⊥[001] deformed microstructure under dislocation energy was discussed deeply. The critical size of nucleation is decreased while the nucleation density is increased in CD∥[001] with high dislocation density, which benefits to form numerous fine DRX grains along the original columnar boundaries. In addition, according to Taylor factors (TFs) criterion, TFs difference will always existed in CD∥[001], which promotes the necklace structure gradually replaced columnar structure and some of them developed into fine DRX bands. With increasing of trues strain, TFs difference gradually decreased in CD⊥[001], DRX nucleation was inhibited, thus the existed DRX grains further grow and finally coarse DRX grains were obtained. The findings clarified the flow behaviors and DRX characteristics of [001] columnar in two directions, and then proposed a microstructure control mechanism of superalloys with [001] columnar based on deformation vector and evolution decomposition.

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改变 [001] 柱状晶粒变形方向对 Ni-Co-W 超合金显微结构控制和 DRX 特性的影响
在超级合金的后续热加工过程中,控制柱状晶粒的演化过程有利于实现微观结构的调节。本研究以 Ni-Co-W 超合金为例,旨在阐明微结构演化过程中压缩方向与动态再结晶(DRX)行为之间的内在联系。压缩方向(CD)平行或垂直于[001]柱状分别定义为 CD∥[001] 和 CD⊥[001]。深入研究了热变形过程中两组实验条件下的柱状演化和 DRX 特性。结果表明,CD⊥[001]时更容易出现完整的 DRX,而 CD∥[001] 时则容易形成细小的 DRX 晶粒。深入讨论了在位错能作用下,CD∥[001] 和 CD⊥[001] 变形微结构中的 DRX 成核问题。在CD∥[001]中,由于位错密度较高,成核临界尺寸减小,而成核密度增大,有利于沿原柱状边界形成大量细小的DRX晶粒。此外,根据泰勒系数(TFs)准则,CD∥[001]中始终存在TFs差异,这促使项链状结构逐渐取代柱状结构,其中一些发展成为细小的DRX条带。随着真应变的增加,CD⊥[001] 中的 TFs 差逐渐减小,DRX 成核受到抑制,从而使已存在的 DRX 晶粒进一步长大,最终得到粗大的 DRX 晶粒。研究结果阐明了[001]柱状体在两个方向上的流动行为和 DRX 特性,进而提出了基于变形矢量和演化分解的[001]柱状体超合金微观结构控制机制。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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