GH4698合金冷轧变形微观组织演变及力学性能研究

谭龙鲜; 杨建兵; 冀宣名; 谭元标; 向嵩

doi:10.3969/j.issn.1674-6457.2026.10.020

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (10) : 199-208. DOI: 10.3969/j.issn.1674-6457.2026.10.020

高温合金成形

GH4698合金冷轧变形微观组织演变及力学性能研究

谭龙鲜, 杨建兵, 冀宣名, 谭元标, 向嵩^*

作者信息 +

Microstructural Evolution and Mechanical Properties of GH4698 Alloy under Cold Rolling Deformation

TAN Longxian, YANG Jianbing, JI Xuanming, TAN Yuanbiao, XIANG Song^*

Author information +

文章历史 +

摘要

目的阐明GH4698镍基变形高温合金在冷加工过程中的组织演变规律及其对力学性能的影响机制,并明确不同冷轧变形量下强韧性能变化的内在原因。方法系统研究了30%、50%和70%冷轧变形条件下合金的显微组织特征与力学性能变化。通过SEM、EBSD和TEM对晶粒形貌、晶体取向及位错结构进行表征,结合XRD分析物相组成,并采用显微硬度测试和室温拉伸实验对力学性能进行评价。结果随着变形量增加,晶粒沿轧制方向被显著拉长,织构增强,低角度晶界比例及位错密度明显提高。合金在整个冷轧过程中始终保持稳定的FCC单相结构。高变形量试样中形成大量位错胞、位错缠结及层错结构,并出现晶粒细化现象。力学性能测试结果表明,当变形量从0%增加至70%时,合金硬度由固溶态的395.8HV提升至569.1HV,抗拉强度由872 MPa提高至1 767 MPa,而延伸率明显下降。结论冷轧变形导致材料强度提升,主要归因于变形过程中产生的高密度位错及缺陷结构所引起的显著加工硬化效应。但与此同时,这些高密度缺陷也作为位错运动的阻碍,牺牲了材料的塑性变形能力,使其延伸率下降。

Abstract

The work aims to clarify the microstructural evolution of the GH4698 nickel-based wrought superalloy during cold processing and its influence on mechanical properties, as well as to elucidate the intrinsic mechanisms underlying the changes in strength and ductility under different cold-rolling strains. The microstructural features and mechanical properties of the alloy were systematically investigated under cold-rolling strains of 30%, 50%, and 70%. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were employed to characterize grain morphology, crystallographic orientation, and dislocation structures, while X-ray diffraction (XRD) was used to analyze the phase composition. Mechanical performance was evaluated by microhardness testing and room-temperature tensile experiments. With increasing cold-rolling strain, grains were elongated markedly along the rolling direction, the texture strength increased, and the fraction of low-angle grain boundaries and dislocation density rose significantly. The alloy maintained a stable FCC single-phase structure throughout the cold-rolling process. High-strain samples exhibited numerous dislocation cells, dislocation tangles, and stacking fault structures, along with grain refinement. Mechanical tests indicated that when the strain increased from 0% to 70%, the hardness increased from 395.8HV (solution-treated state) to 569.1HV, and the tensile strength increased from 872 MPa to 1 767 MPa, whereas elongation decreased significantly. In conclusion, the strength enhancement of the alloy during cold rolling is primarily attributed to significant work hardening induced by the high density of dislocations and defect structures generated during deformation. At the same time, these high-density defects impede dislocation motion, reducing the plastic deformation capacity of the alloy and leading to decreased elongation.

导出引用

谭龙鲜, 杨建兵, 冀宣名, 谭元标, 向嵩. GH4698合金冷轧变形微观组织演变及力学性能研究[J]. 精密成形工程. 2026, 18(10): 199-208 https://doi.org/10.3969/j.issn.1674-6457.2026.10.020

TAN Longxian, YANG Jianbing, JI Xuanming, TAN Yuanbiao, XIANG Song. Microstructural Evolution and Mechanical Properties of GH4698 Alloy under Cold Rolling Deformation[J]. Journal of Netshape Forming Engineering. 2026, 18(10): 199-208 https://doi.org/10.3969/j.issn.1674-6457.2026.10.020

中图分类号： TG146.1 TG132.3

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