Electron Beam Melting of Metastable Austenitic Stainless Steel

Electron Beam Melting of Metastable Austenitic Stainless Steel
Author :
Publisher : BoD – Books on Demand
Total Pages : 170
Release :
ISBN-10 : 9783737608480
ISBN-13 : 3737608482
Rating : 4/5 (80 Downloads)

Book Synopsis Electron Beam Melting of Metastable Austenitic Stainless Steel by : Johannes Günther

Download or read book Electron Beam Melting of Metastable Austenitic Stainless Steel written by Johannes Günther and published by BoD – Books on Demand. This book was released on 2020-01-01 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel. Independent of the applied process parameters, to this point this alloy exhibits a fine-grained and weak textured microstructure in the as-built state upon EBM processing. As detailed in the literature review, this is opposite to numerous alloys like the benchmark AISI 316L stainless steel, which are commonly characterized by epitaxial growth of columnar grains elongated parallel to building direction. A theory for this unusual observation is presented based on a grain refinement due the process-inherent cyclic heat-treatment, i.e. repetitive reheating and partial melting of the consolidated material due to the energy input during melting of subsequent layers and resulting solid-liquid as well as solid-solid (ferritic bcc to austenitic fcc phase and vice versa) phase transformations. A calculation of the phase diagram, differential thermal II Abstract analysis and the investigation of the uppermost layers of bulky and thin-walled EBM processed structures are conducted to support this assumption. Moreover, the CrMnNi stainless steel specimens are characterized by an outstanding damage tolerance, which is demonstrated by tensile testing and examination of the fracture surfaces revealing large lack-of-fusion defects due to unsuitable process parameters. Combined EBSD and X-ray diffraction analysis attribute the high damage tolerance to a pronounced strain hardening and mitigation of the effect of defects due to the transformation-induced plasticity (TRIP) effect. The deformation-induced martensitic transformation and associated strain hardening has also been correlated to a considerable low-cycle fatigue performance even under the presence of large inhomogeneities. The chemical composition of the alloy upon EBM processing is strongly dependent on the process parameters, i.e. it is demonstrated that the evaporation rate of Mn varies with the scan strategy and volumetric energy density. This phenomenon is utilized for the fabrication of homogeneous specimens with different Mn concentrations and resulting mechanical properties.These findings are subsequently employed for a prove-of-concept of the possibility to produce functionally graded material by a spatial adjustment of the scan strategy throughout the layer-wise built-up of objects. This is a novel approach for the synthetization of functionally graded materials based on the processing of one homogenous precursor powder feedstock. In summary, the particular CrMnNi stainless steel is introduced as a novel alloy design for AM because it addresses current material-related issues inherent in layer-wise technologies and potentially further contributes to the exploitation of the full potential of AM.


Electron Beam Melting of Metastable Austenitic Stainless Steel Related Books

Electron Beam Melting of Metastable Austenitic Stainless Steel
Language: en
Pages: 170
Authors: Johannes Günther
Categories: Technology & Engineering
Type: BOOK - Published: 2020-01-01 - Publisher: BoD – Books on Demand

DOWNLOAD EBOOK

The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel.
Hot work tool steel in laser powder bed fusion: from parameter optimization to quality monitoring in industrial application
Language: en
Pages: 202
Authors: Liang Wu
Categories: Technology & Engineering
Type: BOOK - Published: 2024-01-01 - Publisher: BoD – Books on Demand

DOWNLOAD EBOOK

This dissertation thesis focuses on applying the powder bed fusion with laser beam (PBF-LB) technology on hot work steel. It aims at achieving comparable proper
Cladded steel for clutch disc carriers
Language: en
Pages: 178
Authors: Hinrich Lührs
Categories: Technology & Engineering
Type: BOOK - Published: 2021-01-01 - Publisher: BoD – Books on Demand

DOWNLOAD EBOOK

Für die Prozessroute von Lamellenträgern können Stahlschichtverbundwerkstoffe, bestehend aus einem duktilem Grundmaterial und einer verschleißfesten Decksch
Metals Abstracts
Language: en
Pages: 782
Authors:
Categories: Metallurgy
Type: BOOK - Published: 1997 - Publisher:

DOWNLOAD EBOOK

Rapidly Solidified Metastable Materials
Language: en
Pages: 472
Authors: B. H. Kear
Categories: Technology & Engineering
Type: BOOK - Published: 1984 - Publisher: North Holland

DOWNLOAD EBOOK