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Real-time evolution of Selective Laser Melted (SLM) Inconel 718 with temperature through synchrotron X-rays

Sarley, Brooke and Manero, Albert and Cotelo, Jose and Okasinski, John and Kenesei, Peter and Almer, Jonathan and Wischek, Janine and Bartsch, Marion and Raghavan, Seetha (2017) Real-time evolution of Selective Laser Melted (SLM) Inconel 718 with temperature through synchrotron X-rays. In: Proceedings of 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, pp. 1-8. AIAA SciTech Forum. 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 09.-13. Jan. 2017, Grapevine, Texas, USA. DOI: 10.2514/6.2017-1542 ISBN 978-1-62410-453-4

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Official URL: https://arc.aiaa.org/doi/abs/10.2514/6.2017-1542

Abstract

Selective laser melting (SLM) is an additive manufacturing process that uses laser scanning to achieve melting and solidifcation of a metal powder bed. This process, when applied to develop high temperature material systems, holds great promise for more efficient manufacturing of turbine components that withstand extreme temperatures, heat fluxes, and high mechanical stresses associated with engine environments. These extreme operational conditions demand stringent tolerances and an understanding of the material evolution under thermal loading. This work presents a real-time approach to elucidating the evolution of precipitate phases in SLM Inconel 718 (IN718) under high temperatures using high-energy synchrotron x-ray diffraction. Four representative samples (taken along variable build height) were studied in room temperature conditions. Two samples were studied as-processed (samples 1 and 4) and two samples after different thermal treatments (samples 2 and 3). The as-processed samples were found to contain greater amounts of weakening phases. Precipitation hardening of Sample 2 reduced the detectable volume of weakening Delta phase, while also promoting growth of Gamma'' in the matrix. Inversely, solution treatment of Sample 3 produced an overall decrease in precipitate phases. High-temperature, in-situ synchrotron scans during ramp-up, hold, and cool down of two different thermal cycles show the development of precipitate phases. Sample 1 was held at 870C and subsequently ramped up to 1100C, during which the high temperature instability of strengthening precipitate, gamma'', was seen. Gamma'' dissolution occurred after 15 minutes at 870C and was followed by an increase of Delta-phase. Sample 4 was held at 800C and exhibited growth of gamma'' after 20 minutes at this temperature. These experiments use in-situ observations to understand the intrinsic thermal effect of the SLM process and the use of heat treatment to manipulate the phase composition of SLM IN718.

Item URL in elib:https://elib.dlr.de/115801/
Document Type:Conference or Workshop Item (Speech)
Title:Real-time evolution of Selective Laser Melted (SLM) Inconel 718 with temperature through synchrotron X-rays
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sarley, BrookeUniversity of Central FloridaUNSPECIFIED
Manero, Albertuniversity of central florida, orlando, fl, usaUNSPECIFIED
Cotelo, JoseUniversity of Central FloridaUNSPECIFIED
Okasinski, Johnadvanced photon source, argonne national laboratory, argonne, illinoisUNSPECIFIED
Kenesei, Peteradvanced photon source, argonne national laboratory, argonne, illinoisUNSPECIFIED
Almer, Jonathanadvanced photon source, argonne national laboratory, argonne, illinoisUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Raghavan, Seethauniversity of central florida, orlando, fl, usaUNSPECIFIED
Date:January 2017
Journal or Publication Title:Proceedings of 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2017-1542
Page Range:pp. 1-8
Publisher:AIAA SciTech Forum
ISBN:978-1-62410-453-4
Status:Published
Keywords:Selective Laser Melting, Phase Evolution, in situ Observation, Synchrotron, x-rax diffraction
Event Title:58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Event Location:Grapevine, Texas, USA
Event Type:international Conference
Event Dates:09.-13. Jan. 2017
Organizer:American Institute of Aeronautics and Astronautics Inc, AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Institute of Materials Research > Mechanical Testing of Materials
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:22 Nov 2017 10:36
Last Modified:22 Nov 2017 10:36

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