低塑性变形:低塑性变形:对镍基锻造超级合金 GH4698 热处理过程中微观结构演变的影响

IF 4.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan
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引用次数: 0

摘要

我们全面研究了固溶热处理(SHT)过程中环境温度下的低塑性变形(LPD)对镍基锻造超级合金 GH4698 微观结构演变的影响。对圆柱形试样施加 2%-10% 的 LPD 不会明显改变晶粒形态。然而,在应力场的作用下,部分初始退火孪晶界(TB)会转变为其他类型的晶界。有效应变范围在 0.025 至 0.042 之间的变形微结构(对应于 4% 变形样品的整个区域和 6% 变形样品的近端区域)在 SHT 过程中显示出孪晶部分的明显增加,并伴随着多个大型孪晶相关畴(TRDs)和多个异常大晶粒(ALGs)的形成。TRDs 及其内部 ALGs 的出现源于受约束的再结晶成核和广泛的孪晶。在热应力的驱动下,未通过再结晶得到缓解的残余应变能引发了孪晶成核,并促进了晶界迁移。岛状孪晶以及终止于晶粒内部的孪晶的出现和消失表明,在 TRDs 演化过程中,引入的 TB 不仅包括相干 TB,还包括潜在的高流动性非相干 TB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low plastic deformation: Its impact on the microstructural evolution during heat treatment of nickel-based wrought superalloy GH4698
A comprehensive investigation into the effects of low plastic deformation (LPD) at ambient temperature on the microstructural evolution of the nickel-based wrought superalloy GH4698 during solution heat treatment (SHT) was conducted. Applying 2%–10 % LPD to cylindrical specimens did not markedly alter the grain morphology. However, a portion of the initial annealing twin boundaries (TBs) would transform into other types of grain boundaries under the application of the stress field. Deformation microstructures with effective strains ranging from 0.025 to 0.042 (corresponding to the entire region of the 4 % deformed sample and the near-end region of the 6 % deformed sample) exhibited a pronounced increase in twin fraction during SHT, accompanied by the formation of multiple large twin-related domains (TRDs) and several abnormally large grains (ALGs). The occurrence of TRDs and their internal ALGs stems from the constrained nucleation of recrystallization and extensive twinning. The residual strain energy not alleviated through recrystallization, driven by thermal stress, initiates twin nucleation and promotes grain boundary migration. The emergence and disappearance of island-like twins, as well as twins terminating within grains, suggest that the introduced TBs include not only coherent TBs but also potentially highly mobile incoherent TBs during the evolution of TRDs.
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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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