60 years of geotechnics at the RWTH Aachen /

Feinendegen, Martin

doi:10.1002/geot.201090022

Cited by 2 publications

(3 citation statements)

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“…The process parameters, laser power

P_{normalL}

, scan velocity

v_{normals}

, hatch distance

Δ y_{normals}

, as well as layer thickness

D_{normals}

determine the energy density

E_{normalv}

. [ 4 ]

E_{normalv} = \frac{P_{normalL}}{v_{normals} \cdot Δ y_{normals} \cdot D_{normals}}

…”

Section: Methodsmentioning

confidence: 99%

“…[ 1,2 ] In the LPBF process, selected areas of metal powder are melted layer by layer with a focused laser beam to fuse the material into a 3D part. [ 3,4 ] The main advantage of LPBF is the capacity to produce complex geometry parts in a relatively short time compared to conventional manufacturing methods. This advantage is also of interest in the roller bearing industry, where, for example, a flexible design of the outer geometries can be achieved.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Qin

Saewe

Kunz

et al. 2023

steel research int.

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The laser powder bed fusion (LPBF) technology has been involved in the tooling industry to produce tools with complex geometry and integrated functions. However, tool steels with high carbon content tend to crack due to the thermal stresses during the LPBF process. One solution is increasing the powder bed temperature to avoid large thermal gradients. In the present study, the influence of the preheating temperature on microstructure and corresponding hardness is systematically investigated. With the help of time–temperature–transformation diagram, the phase evolution during the LPBF process is systematically explained. AISI M50 samples are produced by LPBF from room temperature to a preheating temperature of 650 °C. Higher preheating temperatures shift the optimal laser parameter window to lower volume energy densities. A cellular/dendritic microstructure formed during the rapid solidification with retained austenite is located at the interdendritic regions. Moreover, a high preheating temperature reduces the retained austenite fraction, specifically from 39% without preheating to 7.6% at 650 °C preheating temperature.

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“…The process parameters, laser power

P_{normalL}

, scan velocity

v_{normals}

, hatch distance

Δ y_{normals}

, as well as layer thickness

D_{normals}

determine the energy density

E_{normalv}

. [ 4 ]

E_{normalv} = \frac{P_{normalL}}{v_{normals} \cdot Δ y_{normals} \cdot D_{normals}}

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Qin

Saewe

Kunz

et al. 2023

steel research int.

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show abstract

“…Powder metallurgy allows wider control over adjustment of composition, fraction, size and distribution of reinforcements [11-14]. In melting and casting, TiB 2 forms as large primary particles and then matrix undergoes a pseudobinary reaction forming eutectic areas in α-Fe(Co) [15]. Unlike formation and distribution of some carbides in steel [16], the effect of elemental additions on the morphology of the particles formed is considered limited [7].…”

Section: Introductionmentioning

confidence: 99%

Fe–TiB₂ composites produced through casting technique

Abbas

2020

Materials Science and Technology

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A hypereutectic composition of α-Fe(Co)–TiB2 composite was produced in strip and rod form through casting technique. The phases observed in the composite consisted of α-Fe(Co) and TiB2. Primary TiB2 particles in the rod measured upto 50 µm while for strip the size remained upto 20 µm. Hardness and elastic modulus values of 33.7 and 504 GPa were obtained for the TiB2 particles respectively. Coarse grains and lamellar α-Fe(Co)–TiB2 eutectic was observed in the rod while the microstructure was finer in the strip. The matrix possessed a hardness of ∼6 GPa. TiB2 particles possessed low indentation fracture toughness. Good homogeneity and better distribution of microstructural features resulted in less scatter in the values of hardness and elastic modulus.

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60 years of geotechnics at the RWTH Aachen /

Cited by 2 publications

References 0 publications

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Fe–TiB₂ composites produced through casting technique

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60 years of geotechnics at the RWTH Aachen /

Cited by 2 publications

References 0 publications

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Fe–TiB2 composites produced through casting technique

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About

Fe–TiB₂ composites produced through casting technique