Neutron dark-field imaging applied to porosity and deformation-induced phase transitions in additively manufactured steels

被引：11

作者：

Bacak, M. ^{[1
]}

Valsecchi, J. ^{[1
,2
]}

Capek, J. ^{[1
]}

Polatidis, E. ^{[1
]}

Kaestner, A. ^{[1
]}

Arabi-Hashemi, A. ^{[3
]}

Kruk, I ^{[4
]}

Leinenbach, C. ^{[3
]}

Long, A. M. ^{[4
,5
]}

Tremsin, A. ^{[5
]}

Vogel, S. C. ^{[4
]}

Watkins, E. B. ^{[4
]}

Strobl, M. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, Forschungsstr 111, CH-5232 Villigen, Switzerland

[2] Univ Geneva, CH-1211 Geneva, Switzerland

[3] Empa, Swiss Fed Labs Mat Sci & Technol, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[5] Univ Calif Berkeley, Space Sci Lab, 7 Gauss Way, Berkeley, CA 94720 USA

来源：

MATERIALS & DESIGN | 2020年 / 195卷

关键词：

Neutron dark-field imaging; Additive manufacturing; STAINLESS-STEEL; MECHANICAL-PROPERTIES; PROCESSING PARAMETERS; TEXTURE ANALYSIS; LASER; FATIGUE; 316L; TRANSFORMATION; BEAMLINE; CONTRAST;

D O I：

10.1016/j.matdes.2020.109009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron dark -field imaging (DFI) was used to investigate the microstructure of additive manufactured steels. Several DFI methods were combined to assess the microstructure over more than two orders of magnitude in size. Different degrees of porosity and other building features were found depending on the parameters of the selective laser melting additive manufacturing process. A sample built with processing parameters yielding the lowest porosity was deformed which induced a phase transformation of the austenitic phase (fcc) into the martensitic phase (bcc). In the deformed sample an increased dark-field contrast was observed which can only be explained by accounting for the fcc-bcc phase distribution and the magnetic properties of the martensitic phase. We demonstrate that neutron dark-field imaging is well suited to not only detect build flaws like cracks but quantitatively characterize the microstructure in additive manufactured steels.(c) 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页数：9

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