Variation of hardness, microstructure, and Laves phase distribution in direct laser deposited alloy 718 cuboids

Stevens, Erica; Toman, Jakub; To, Albert C.; Chmielus, Markus

doi:10.1016/j.matdes.2017.01.031

Cited by 111 publications

(37 citation statements)

References 38 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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“…Researchers [8][9][10][11] studied strength variations within the weld region using Vickers hardness mapping technique and showed that it is a robust technique to quantify weld heterogeneity. A new homogenization technique to simplify a complex weld using slip line analysis was formulated in [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Weld Homogenization Schemes Based on Plastic Loading of Single Edge Notched Tension (SE(T)) Tests

Naib

Waele

2017

Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); SPC Track for Sena

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“…Samples were fabricated with a laser travel speed of 33 mm/s. The laser power was selected as 200W, 250W and 270W, producing linear energydefined as laser power (J) /laser travel speed (mm) [54]. Therefore the linear energy is 6.06 J/mm, 7.75 J/mm and 8.33 J/mm respectively.…”

Section: Lens As-printed Samples I) the First Batch Of Samplesmentioning

confidence: 99%

Development of Oxide-Dispersion-Strengthened Nickel-Based Super Alloy Powders for Additive Manufacturing

Huang¹

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Oxide-Dispersion-Strengthened (ODS) Nickel-Based superalloy has been drawn a huge attention and developed with good oxidation resistance, corrosion resistance and high creep strength. It has been considered as critical materials for Additive Manufacturing (AM). The quality and the efficiency of fabrication methods of ODS limits the performance of itself on AM. The development of new type of ODS, new methodologies and evaluation techniques are required if the enhanced quality of ODS and enhanced efficiency of fabrication are to be achieved. Of the current fabrication techniques for AM, Gas Atomization (GA) is widely used since they can generate spherical powders with high qualities. However, GA is incapable of producing Ni-based ODS powders with uniform dispersion oxide contents since it requires the melting on constituent powders, and oxide contents have higher melting point than other major contents. Ball-milling (BM), is a prevailing and wellknown technique for ODS and has been proven with the capability of producing particles with nanocrystalline structures. Mechano-Chemical-Bonding (MCB) is another new type of technique by using mechanical alloying effect without adding any binders to produce ODS. In this research, MCB (MCB-only process) and its combined technique (MCB+BM process) were carried out to produce ODS powders with composition of Ni-20Cr-5Al-3W-1.5Y2O3 in wt%. The MCB is different with previous published techniques, raw element particles are subjected to breakdown, mixing, diffusion bonding, fracturing, shearing, and re-welding under different rotating speeds and different running durations. X-ray Diffraction (XRD) was adopted to prove that Y2O3 has been evenly distributed onto major particles. Also, the morphology, shape and size of particles are analyzed Scanning Electron Microscope (SEM). More spherical in shape and smoother particle surface produced by the MCB than the BM that benefits powder feeding during AM. Also, X-ray diffraction (XRD) was utilized to examine the lattice spacing of crystal structure. Three different batches of powders fabricated by the MCB process and its combined techniques were used in two different AM system. Results shows the powders were successfully deposited onto flat substrates and densified microstructures were obtained. In order to investigate the as-printed microstructure, X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) were employed. In conclusion, MCB-only technique can manufacture desirable Nickel-base alloy for AM by determining the particle shape, surface and size characteristics, as well as, reasonable alloy status and profound microstructure.

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Variation of hardness, microstructure, and Laves phase distribution in direct laser deposited alloy 718 cuboids

Cited by 111 publications

References 38 publications

The Hardness of Additively Manufactured Alloys

The Hardness of Additively Manufactured Alloys

Evaluation of Weld Homogenization Schemes Based on Plastic Loading of Single Edge Notched Tension (SE(T)) Tests

Development of Oxide-Dispersion-Strengthened Nickel-Based Super Alloy Powders for Additive Manufacturing

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