激光再制造Ti2AlC改性Inconel 718合金微观组织和力学性能研究

doi:10.3901/JME.2025.12.153

摘要/Abstract

摘要： 对损伤Inconel 718零部件进行现场激光再制造具有良好的经济效益，然而以商业Inconel 718合金粉末为原料的激光修复在母材和修复区产生了显著的机械性能差异，对其进行成分改性是一种有效的改善途径。采用添加Ti₂AlC的Inconel 718复合粉末对损伤Inconel 718合金基体进行激光修复试验，重点比较了不同光斑直径配置下修复后试样的力学性能。结果表明：添加10 vol.% Ti₂AlC可以抑制Inconel 718在非平衡凝固过程中有害Laves相的析出，并促进碳化物和强化相γ'相形成。在3 mm光斑直径配置下，添加Ti₂AlC使屈服强度、抗拉强度和硬度较未添加时分别提升了17.0%、11.1%和46.3%；当进一步减小光斑直径至0.8 mm时，可以使屈服强度、抗拉强度和硬度分别提升80.0%、72.6%和59.2%。提出的利用Ti₂AlC改性Inconel 718合金的方法可为损伤Inconel 718零部件的高质量修复提供新的解决方案。

关键词: 激光再制造, Inconel 718合金, Ti₂AlC, 成分改性, 力学性能

Abstract: On-site laser remanufacturing of damaged Inconel 718 components presents significant economic benefits. However, the use of commercial Inconel 718 alloy powder for laser repair results in notable mechanical property disparities between the substrate and the repaired region. Modifying the composition is an effective approach to address this issue. Laser repair experiments were conducted on damaged Inconel 718 alloy substrates using composite powder containing Ti₂AlC, focusing on comparing the mechanical properties of repaired specimens under different beam diameter configurations. The results indicate that adding 10 vol.% Ti₂AlC suppresses the formation of detrimental Laves phase during non-equilibrium solidification of Inconel 718 while promoting the formation of carbides and strengthening phase γ'. Under the configuration of a 3 mm beam diameter, the addition of Ti₂AlC increases yield strength, tensile strength, and hardness by 17.0%, 11.1%, and 46.3% respectively compared to the non-additive case. When further reducing the beam diameter to 0.8 mm, yield strength, tensile strength, and hardness increase by 80.0%, 72.6%, and 59.2% respectively. The proposed method of utilizing Ti₂AlC-modified Inconel 718 alloy provides a new solution for the high-quality repair of damaged Inconel 718 components.

Key words: laser remanufacturing, Inconel 718, Ti₂AlC, compositional modification, mechanical properties

中图分类号:

TG146

孔玉, 彭开元, 黄海鸿. 激光再制造Ti₂AlC改性Inconel 718合金微观组织和力学性能研究[J]. 机械工程学报, 2025, 61(12): 153-163.

KONG Yu, PENG Kaiyuan, HUANG Haihong. Microstructure and Mechanical Properties of Laser Remanufactured Ti₂AlC Modified Inconel 718 Alloy[J]. Journal of Mechanical Engineering, 2025, 61(12): 153-163.

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激光再制造Ti₂AlC改性Inconel 718合金微观组织和力学性能研究

Microstructure and Mechanical Properties of Laser Remanufactured Ti₂AlC Modified Inconel 718 Alloy

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