Supersolidus Liquid Phase Sintering and Heat Treatment on Atomic Diffusion Additive Manufacturing Produced Ledeburitic Cold Work Tool Steel

Article Materials Science, Multidisciplinary

Cracking mechanism in a laser powder bed fused cold-work tool steel: The role of residual stresses, microstructure and local elemental concentrations

Jan Platl et al.

Summary: Laser powder bed fusion (LPBF) can enhance cutting speeds of tools by implementing complex internal cooling channels, but cracks are prone to occur in tool steels due to their high carbon and alloying element contents and related stresses during the fast cooling process. In this research, the correlation between microscopic crack patterns, residual stress gradients, local microstructure, and near-crack elemental concentrations in tool steels processed via LPBF is studied using various techniques. The formation of horizontal micro-cracks is found to be related to residual stress drops, especially at geometrically notched positions and sample edges. The cracks mainly propagate along the network of eutectic carbides deposited at the grain boundaries of carbon martensite and retained austenite matrix. The study reveals the dominant cracking mechanism of stress-induced cracking of eutectic carbides formed during solidification in tool steels during the LPBF process.

ACTA MATERIALIA (2022)

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Article Metallurgy & Metallurgical Engineering

Quantification of methods used in field metallography using the example of quality assurance measures for a circular economy for high-alloy steels

P. Kronenberg et al.

Summary: This study aims to develop an on-site metallography method to characterize carbide banding in cold-work steels using cellulose acetate film replication. It is demonstrated that grinding the sample surface with P1500 mesh SiC abrasive paper and etching it with V(2)A etchant or nitric acid for 7 minutes is sufficient for removing the matrix and leaving negative impressions of the carbides on the film. The negative replica can be studied under a reflected light microscope to characterize the carbide banding.

PRAKTISCHE METALLOGRAPHIE-PRACTICAL METALLOGRAPHY (2022)

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Review Materials Science, Multidisciplinary

Wire Arc Additive Manufacturing: Review on Recent Findings and Challenges in Industrial Applications and Materials Characterization

Mukti Chaturvedi et al.

Summary: Wire arc additive manufacturing (WAAM) is a fusion manufacturing process that utilizes the heat energy of an electric arc to melt electrodes and deposit material layers, allowing for efficient production of large parts with structural integrity. High demand from industries such as aerospace and automotive is driving further research and applications of this modern manufacturing technique.

METALS (2021)

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Proceedings Paper Materials Science, Multidisciplinary

A brief review of main ideas of metal fused filament fabrication

Stanislav Roshchupkin et al.

Summary: The article presents the main ideas for 3D printing of metal products based on the FFF technology, including the process of layering molten metal-containing filament and the utilization of Metal Fused Filament Fabrication (MFFF) technology. The possible applications and potential of MFFF technology in mechanical engineering, medicine, and education are analyzed, along with prospects for future research in the field.

MATERIALS TODAY-PROCEEDINGS (2021)

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Article Metallurgy & Metallurgical Engineering