Quasi-in-situ EBSD Study on the Microstructure and Tensile Properties of Selective Laser Melted Inconel 718 Alloy Processed by Different Heat Treatments

IF 3.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2025-06-18 DOI:10.1007/s40195-025-01887-1

Yuanyuan Feng, Jianchao Pang, Xiaoyuan Teng, Chenglu Zou, Jingjing Liang, Yuping Zhu, Shouxin Li, Jinguo Li, Zhefeng Zhang

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Abstract

The effects of various heat treatments on the microstructures and mechanical properties of as-built selective laser melted Inconel 718 alloy were investigated through conventional and quasi-in-situ tensile tests. The corresponding heat treatment processes include direct aging (DA), solution + aging (SA), and homogenization + aging (HA). The DA and SA samples preserve the melt pool configuration and grain size stability, while the precipitated phase characteristics reveal the refinement of the long-strip Laves phase and the appearance of the δ phase, respectively. The HA process induces recrystallization and grain coarsening. The specimens exhibit enhanced strength concomitant with diminished elongation, which is likely attributed to the reduction of the geometrically necessary dislocation density and the intensified precipitation of the γ′′ phase after heat treatment. Tensile plastic deformation displays notable strain concentration along grain boundaries. The dimensional alterations in precipitated phases were measured to quantitatively determine the impact of grain boundary, dislocation and precipitation strengthening on the yield strength after heat treatment. Precipitation strengthening encompasses coherent, order, and Orowan strengthening. A remarkable agreement is revealed between theoretical predictions and experimental results. Insights are offered for optimizing heat treatment processes to comprehend microstructural evolution effect on the mechanical properties of additive-manufactured metals.

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不同热处理方式选择性激光熔化Inconel 718合金组织与拉伸性能的准原位EBSD研究

通过常规拉伸试验和准原位拉伸试验，研究了不同热处理工艺对激光熔备Inconel 718合金显微组织和力学性能的影响。相应的热处理工艺有直接时效（DA）、固溶+时效（SA）和均质+时效（HA）。DA和SA样品保持了熔池结构和晶粒尺寸的稳定性，而析出相特征分别显示了长条状Laves相的细化和δ相的出现。HA过程引起再结晶和晶粒粗化。试样表现出强度增强而延伸率降低的特点，这可能是由于热处理后几何必需的位错密度降低和γ”相析出加剧所致。拉伸塑性变形沿晶界表现出明显的应变集中。通过测量析出相的尺寸变化，定量确定晶界、位错和析出强化对热处理后屈服强度的影响。降水强化包括相干强化、有序强化和奥罗文强化。理论预测与实验结果有显著的一致性。为优化热处理工艺，了解微观组织演变对增材制造金属力学性能的影响提供了见解。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.