热等静压对同步感应加热定向能量沉积γ'强化高温合金微观组织和拉伸性能的影响

许建军; 丁汉林; 林鑫; 刘峰

doi:10.1007/s12613-023-2792-5

Volume 31 Issue 5

May 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(5): 1089-1097

Jianjun Xu, Hanlin Ding, Xin Lin, and Feng Liu, Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 1089-1097. https://doi.org/10.1007/s12613-023-2792-5

Cite this article as:

Jianjun Xu, Hanlin Ding, Xin Lin, and Feng Liu, Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 1089-1097. https://doi.org/10.1007/s12613-023-2792-5

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研究论文

热等静压对同步感应加热定向能量沉积γ'强化高温合金微观组织和拉伸性能的影响

1)
西北工业大学分析测试中心, 西安 710072, 中国
2)
西北工业大学凝固技术国家重点实验室, 西安 710072, 中国

通讯作者:
林鑫 E-mail: xlin@nwpu.edu.cn

刘峰 E-mail: liufeng@nwpu.edu.cn

文章亮点

(1) 揭示了热等静压对同步感应加热定向能量沉积Inconel738LC合金微观组织的影响规律

(2) 明晰了定向能量沉积Inconel738LC合金的微观组织在拉伸变形过程中的作用机制

(3) 探究了定向能量沉积Inconel738LC合金相变和拉伸变形过程中的热-动力学相关性

中文摘要

在国家加速推进航空制造业高质量快速发展的迫切需求下，镍基高温合金的增材制造成为了近年来的研究热点。然而，如何高效提高增材制造镍基高温合金的力学性能是该行业的永恒追求。本文选择Inconel738LC合金为研究对象，通过同步感应加热（加热至1050°C）的方式辅助定向能量沉积（增材制造技术）实验，将沉积样品处理为三组：沉积态、热处理态（1070°C, 2 h + 845°C, 24 h）、热等静压（1190°C，105 MPa，3 h）+相同热处理态，以此研究热等静压对同步感应加热定向能量沉积Inconel738LC合金微观组织和拉伸性能的影响机制。研究结果表明，沉积态样品主要由柱状晶和在枝晶间不均匀分布的γ'相组成。首先经过热等静压处理后，样品的晶粒形态未发生明显变化，但γ'强化相颗粒的尺寸均匀程度明显增大。在相同热处理条件下，沉积态样品和热等静压处理样品中的γ'相均呈现出双峰分布的特征，但是热等静压处理样品中的γ'相尺寸均匀性更佳。对比热处理态和热等静压+热处理态样品的拉伸性能发现，后者的抗拉强度和均匀塑性延伸率比前者分别提高了5%和46%，这得益于后者中更均匀的双峰分布γ'相的协同变形，尤其是更均匀的立方体γ'相的变形。最后，文章基于广义稳定性理论，深入讨论了沉积样品在相变和塑性变形过程中的热-动力学相关性。

关键词:

Research Article

Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition

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Abstract

Abstract

The microstructure characteristics and strengthening mechanism of Inconel738LC (IN-738LC) alloy prepared by using induction-assisted directed energy deposition (IDED) were elucidated through the investigation of samples subjected to IDED under 1050°C preheating with and without hot isostatic pressing (HIP, 1190°C, 105 MPa, and 3 h). Results show that the as-deposited sample mainly consisted of epitaxial columnar crystals and inhomogeneously distributed γ' phases in interdendritic and dendritic core regions. After HIP, grain morphology changed negligibly, whereas the size of the γ' phase became increasingly even. After further heat treatment (HT, 1070°C, 2 h + 845°C, 24 h), the γ' phase in the as-deposited and HIPed samples presented a bimodal size distribution, whereas that in the as-deposited sample showed a size that remained uneven. The comparison of tensile properties revealed that the tensile strength and uniform elongation of the HIP + HTed sample increased by 5% and 46%, respectively, due to the synergistic deformation of bimodal γ' phases, especially large cubic γ' phases. Finally, the relationship between phase transformations and plastic deformations in the IDEDed sample was discussed on the basis of generalized stability theory in terms of the trade-off between thermodynamics and kinetics.
- directed energy deposition;
- Ni-based superalloys;
- high-temperature preheating;
- hot isostatic pressing;
- microstructure;
- tensile properties

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