Investigation on the optimized heat treatment procedure for laser fabricated IN718 alloy

Zhang, Yaocheng; Yang, Li; Chen, Tingyi; Zhang, Weihui; Huang, Xiwang; Dai, Jun

doi:10.1016/j.optlastec.2017.06.027

Cited by 50 publications

(18 citation statements)

References 21 publications

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“…Figure 15. Box and whisker plot showing the variation in Vickers hardness of IN718 parts fabricated by AM and subjected to various post process heat treatments using data from [140,147,[184][185][186][187][188][189][190][191][192][193][194][195][196][197]. Figure 16.…”

Section: (D)mentioning

confidence: 99%

The Hardness of Additively Manufactured Alloys

DebRoy¹,

Zuback²

2018

Preprint

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The rapidly evolving field of additive manufacturing requires a periodic assessment of the progress made in understanding the properties of metallic components. Although extensive research has been undertaken by many investigators, the data on properties such as hardness from individual publications are often fragmented. When these published data are critically reviewed, several important insights that cannot be obtained from individual papers become apparent. We examine the role of cooling rate, microstructure, alloy composition, and post process heat treatment on the hardness of additively manufactured components. Hardness data for steels and aluminum alloys processed by additive manufacturing and welding are compared to understand the relative roles of manufacturing processes. Furthermore, the findings are useful to determine if a target hardness is easily attainable either by adjusting AM process variables or through appropriate alloy selection.

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Section: (D)mentioning

confidence: 99%

The Hardness of Additively Manufactured Alloys

DebRoy¹,

Zuback²

2018

Preprint

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“…In general, post-weld heat treatment (PWHT) must be carried out in the precipitation-strengthened nickel-based superalloy to improve the properties of the weldments [13][14][15]. Solid-solution-strengthened alloys also require PWHT to minimize the segregation (as a result of solidification in the fusion zone, during welding) in order to maintain the solid solution strengthening effect in the fusion zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

et al. 2019

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This work examines the influence of post-weld heat treatment (PWHT) on the fusion zone microstructure, and mechanical properties of electron beam (EB)-welded alloy 686. Comparative studies have been made on weld microstructure and tensile properties of the weldments both in as-welded and post-welded heat-treated conditions. PWHT consists of direct aging (DA/480°C for 3 h) and solution treatment (ST, 980°C for 1 h) followed by ageing and finally, homogenizing treatment (HT, 1200°C for 1 h) followed by DA and ST. The secondary topologically closed packed (TCP) phases formation, their distribution and microsegregation characteristics are studied with the aid of scanning electron microscope (SEM) analysis. Energy-dispersive X-ray spectroscopy (EDS) is also performed to estimate the microsegregation of alloying elements in the dendritic core and interdendritic regions of the weldments. The result shows that there is no significant change in the microstructure of DA and solution-treated sample as compared to the as-welded sample. The microstructure of HT sample was entirely different from those of as-welded and other HT samples. The SEM/EDS analysis illustrates the presence of secondary TCP phases (r, P and l) in the as-weld, DA and ST condition, whereas HT weldments did not show the presence of TCP phases. Tensile test results show higher tensile strength in ST condition whereas homogenization samples show higher ductility compared with others.

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“…Heating with a laser beam is used in the industry to modify the surface layer, e.g. hardening, tempering or modification of the microstructure [5,6]. The remelting process also allows for changing the chemical composition of a surface layer, which is used in alloying cladding.…”

Section: Introductionmentioning

confidence: 99%

“…Combined methods are also used, for example, in a thermochemical treatment in a fluidized bed and further laser treatment [7,8]. Laser technologies associated with remelting require a higher density of radiation power (10 4 -10 10 W / cm 2 ) than the modification of a surface layer without remelting and the time of interaction of the beam with the material of 10 -1 -10 -9 s. High power lasers Nd: YAG and CO 2 with a continuous and pulse operation are mainly used [6]. The modification of a surface layer using laser technology is based on the process of rapid remelting and crystallization of a thin layer at the surface of the material [9,10].…”

Section: Introductionmentioning

confidence: 99%

Impact of Laser Machining on the Structure and Properties of Tool Steels

2018

Materials Research Proceedings

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Investigation on the optimized heat treatment procedure for laser fabricated IN718 alloy

Cited by 50 publications

References 21 publications

The Hardness of Additively Manufactured Alloys

The Hardness of Additively Manufactured Alloys

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

Impact of Laser Machining on the Structure and Properties of Tool Steels

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