Micro- and macro-structural heterogeneities in 316L stainless steel prepared by electron-beam melting

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Micro- and macro-structural heterogeneities in 316L stainless steel prepared by electron-beam melting. / Olsén, Jon; Shen, Zhijian; Liu, Leifeng; Koptyug, Andrey; Rännar, Lars-Erik.

In: Materials Characterization, Vol. 141, 01.07.2018, p. 1-7.

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Olsén, Jon ; Shen, Zhijian ; Liu, Leifeng ; Koptyug, Andrey ; Rännar, Lars-Erik. / Micro- and macro-structural heterogeneities in 316L stainless steel prepared by electron-beam melting. In: Materials Characterization. 2018 ; Vol. 141. pp. 1-7.

Bibtex

@article{42a71a8262134449bf83373f5a3617d0,
title = "Micro- and macro-structural heterogeneities in 316L stainless steel prepared by electron-beam melting",
abstract = "This is a study of the micro- and macrostructural variations in samples of stainless steel with the overall composition of the grade 316L, produced using electron beam melting. Electron beam melting is one of the processing methods under consideration for manufacturing some of the International Thermo- Nuclear Experimental Reactor In-Vessel components. Therefore further studies of the homogeneity of the material were conducted. Electron beam melting results in a complicated thermal history of the manufactured part giving a significant impact on the microstructure. A cellular structure that is often observed in samples prepared by selective laser melting was found in the top layers of the specimens. Further down, the structure changed until the cellular structure was almost non-existing, and the grain boundaries had become more pronounced. This revelation of a heterogeneous structure throughout the entire part is crucial for large-scale industrial applications like the Thermo- Nuclear Experimental Reactor to make sure that it is understood that the properties of the material might not be the same at every point, as well as to assure that the correct post-treatment is done. It is also exposed that a significant part of this change is due to molybdenum redistribution inside the sample when it diffuses from the cell boundaries into the cells, and into bigger agglomerates in the grain boundaries. This diffusion seems not to affect the microhardness of the samples.",
keywords = "additive manufacturing, electron beam melting, microstructure, 316L stainless steel, heterogeneous material",
author = "Jon Ols{\'e}n and Zhijian Shen and Leifeng Liu and Andrey Koptyug and Lars-Erik R{\"a}nnar",
year = "2018",
month = jul,
day = "1",
doi = "10.1016/j.matchar.2018.04.026",
language = "English",
volume = "141",
pages = "1--7",
journal = "Materials Characterization",
issn = "1044-5803",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Micro- and macro-structural heterogeneities in 316L stainless steel prepared by electron-beam melting

AU - Olsén, Jon

AU - Shen, Zhijian

AU - Liu, Leifeng

AU - Koptyug, Andrey

AU - Rännar, Lars-Erik

PY - 2018/7/1

Y1 - 2018/7/1

N2 - This is a study of the micro- and macrostructural variations in samples of stainless steel with the overall composition of the grade 316L, produced using electron beam melting. Electron beam melting is one of the processing methods under consideration for manufacturing some of the International Thermo- Nuclear Experimental Reactor In-Vessel components. Therefore further studies of the homogeneity of the material were conducted. Electron beam melting results in a complicated thermal history of the manufactured part giving a significant impact on the microstructure. A cellular structure that is often observed in samples prepared by selective laser melting was found in the top layers of the specimens. Further down, the structure changed until the cellular structure was almost non-existing, and the grain boundaries had become more pronounced. This revelation of a heterogeneous structure throughout the entire part is crucial for large-scale industrial applications like the Thermo- Nuclear Experimental Reactor to make sure that it is understood that the properties of the material might not be the same at every point, as well as to assure that the correct post-treatment is done. It is also exposed that a significant part of this change is due to molybdenum redistribution inside the sample when it diffuses from the cell boundaries into the cells, and into bigger agglomerates in the grain boundaries. This diffusion seems not to affect the microhardness of the samples.

AB - This is a study of the micro- and macrostructural variations in samples of stainless steel with the overall composition of the grade 316L, produced using electron beam melting. Electron beam melting is one of the processing methods under consideration for manufacturing some of the International Thermo- Nuclear Experimental Reactor In-Vessel components. Therefore further studies of the homogeneity of the material were conducted. Electron beam melting results in a complicated thermal history of the manufactured part giving a significant impact on the microstructure. A cellular structure that is often observed in samples prepared by selective laser melting was found in the top layers of the specimens. Further down, the structure changed until the cellular structure was almost non-existing, and the grain boundaries had become more pronounced. This revelation of a heterogeneous structure throughout the entire part is crucial for large-scale industrial applications like the Thermo- Nuclear Experimental Reactor to make sure that it is understood that the properties of the material might not be the same at every point, as well as to assure that the correct post-treatment is done. It is also exposed that a significant part of this change is due to molybdenum redistribution inside the sample when it diffuses from the cell boundaries into the cells, and into bigger agglomerates in the grain boundaries. This diffusion seems not to affect the microhardness of the samples.

KW - additive manufacturing

KW - electron beam melting

KW - microstructure

KW - 316L stainless steel

KW - heterogeneous material

U2 - 10.1016/j.matchar.2018.04.026

DO - 10.1016/j.matchar.2018.04.026

M3 - Article

VL - 141

SP - 1

EP - 7

JO - Materials Characterization

JF - Materials Characterization

SN - 1044-5803

ER -