Effect of heat treatment on the microstructure evolution and mechanical behaviour of a selective laser melted Inconel 718 alloy

Huang, Liang; Cao, Yan; Zhang, Jiahao; Gao, Xusen; Li, Gaohong; Wang, Yuanfei

doi:10.1016/j.jallcom.2021.158613

Cited by 54 publications

(4 citation statements)

References 19 publications

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“…Thus, these abundant dislocations turn to new sub-grain boundaries, resulting in the formation of nano-grains. Moreover, because of the lowstacking-fault-energy [33] of Inconel 718, the plastic deformation would induce the formation of nanotwin lamellae in this region. The elongated grains are close to the nano grains and exist in the region about 2.5-4 μm away from the grinding surface, which are parallel to the grinding direction.…”

Section: (C)mentioning

confidence: 99%

Mechanism of gradient strengthening layer formation based on microstructure and microhardness of Inconel 718 grinding surface

Dong

Zhang

et al. 2022

Int J Adv Manuf Technol

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Gradient strengthening layer will emerge on the grinding surface of Inconel 718 due to the difference of microstructure. The surface microstructure and microhardness are not independent of each other, and the microhardness is the embodiment of the microstructure evolution in the strength aspect. In this paper, the microstructure observation, microhardness experiments and strengthening theory were combined to analyze. The experimental results show that the grinding surface consists of grain refinement layer and high-density dislocation layer. The grain refinement layer is constituted of equiaxed nano-grains and elongated grains, in which grain boundary strengthening occurred leading to an increase in microhardness. Dislocation strengthening occurred in the high-density dislocation layer, in which the increment of dislocation density is approximately 3.54 × 10 9 mm -2 compared with inner matrix. Microhardness of high-density dislocation region reaches the maximum (438.6 ± 11.1 HV0.01) because of the dislocation strengthening. The variation of microhardness is discussed from two strengthening mechanisms of grain boundary strengthening and dislocation strengthening, and the strengthening mechanism in the different regions of grinding surface is revealed. The calculated microhardness increments through these mechanisms in the refined-grain region and the high-density dislocation region are basically consistent with the measured values.

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Section: (C)mentioning

confidence: 99%

Mechanism of gradient strengthening layer formation based on microstructure and microhardness of Inconel 718 grinding surface

Dong

Zhang

et al. 2022

Int J Adv Manuf Technol

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“…To assess the mechanical properties of L-PBF IN725, we plot the engineering stress-strain behaviour of the alloy in tension-both in the as-printed and heat-treated conditions-and compare the results against the 2017 ASTM B805 standard for wrought IN725 [36], as well as the literature data on L-PBF IN625 [58] and L-PBF IN718 [59] which were heat-treated following ASTM standards. We show the experimental results in Fig.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Laser powder bed fusion of high-strength and corrosion-resistant Inconel alloy 725

Todaro

Rashidi

Liu

et al. 2022

Materials Characterization

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“…Several studies have investigated laser additive manufacturing of nickel-based alloy systems. So far, most of these related studies have focused on conventional nickel-based high-temperature alloys, such as Inconel 718 and Inconel 625 [15][16][17][18][19]. However, the design of these alloys does not consider the particular characteristics of laser additive manufacturing (LAM), which are prone to porous metallurgical defects, under-fusion, and cracks [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Content on Microstructure and Mechanical Properties of Laser Melting Deposited Inconel 690 Alloy

et al. 2023

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Inconel 690 alloy is widely used in nuclear power, petrochemical, aerospace, and other fields due to its excellent high-temperature mechanical properties and corrosion resistance. The Inconel 690 alloy with different Mo content was fabricated by laser melting deposition (LMD). The effects of Mo content on the microstructure and mechanical properties were investigated. The microstructure of as-deposited Inconel 690 is composed of columnar dendrites grown epitaxially, and M23C6 carbides are precipitated in the grain boundaries. With the increase of Mo content, the amount of precipitated carbide increases gradually. At the same time, the grain boundary becomes convoluted. The tensile test at room temperature shows that the high Mo content in the as-deposited Inconel 690 increases the ultimate strength but decreases the ductility. Compared with low Mo content, the alloy with high Mo deposition has better mechanical properties. The present study provides a new method to achieve the preparation of Inconel 690 alloy with excellent integrated mechanical properties.

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Effect of heat treatment on the microstructure evolution and mechanical behaviour of a selective laser melted Inconel 718 alloy

Cited by 54 publications

References 19 publications

Mechanism of gradient strengthening layer formation based on microstructure and microhardness of Inconel 718 grinding surface

Mechanism of gradient strengthening layer formation based on microstructure and microhardness of Inconel 718 grinding surface

Laser powder bed fusion of high-strength and corrosion-resistant Inconel alloy 725

Effect of Mo Content on Microstructure and Mechanical Properties of Laser Melting Deposited Inconel 690 Alloy

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