Electron microscopy study of direct laser deposited IN718

Rengen Ding; ZW Huang; Hangyue Li; I. Mitchell; G. Baxter; P. Bowen

doi:10.1016/j.matchar.2015.06.017

Electron microscopy study of direct laser deposited IN718

Rengen Ding, ZW Huang, Hangyue Li, I. Mitchell, G. Baxter, P. Bowen

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

334 Downloads (Pure)

Abstract

The microstructure of direct laser deposited (DLD) IN718 has been investigated in detail using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results confirm that the dendrite core microstructure can be linked to the cooling rate experienced during the deposition. A ~ 100 μm wide δ partially dissolved region in the IN718 substrate was observed close to the substrate/deposit boundary. In the deposited IN718, γ/Laves eutectic constituent is the predominant minor microconstituent. Irregular and regular (small) (Nb,Ti)C carbides and a mixture of the carbides and Laves were observed. Most M3B2 borides were nucleated around a (Nb,Ti)C carbide. Needles of δ phase precipitated from the Laves phase were also observed. A complex constituent (of Laves, δ, α-Cr, γ″, and γ matrix) is reported in IN718 for the first time. The formation of α-Cr particles could be related to Cr rejection during the formation and growth of Cr-depleted δ phase.

Original language	English
Pages (from-to)	324-337
Journal	Materials Characterization
Volume	106
Early online date	21 Jun 2015
DOIs	https://doi.org/10.1016/j.matchar.2015.06.017
Publication status	Published - Aug 2015

Keywords

IN718
Laser deposition
Microstructure
TEM

Access to Document

10.1016/j.matchar.2015.06.017

Ding_et_al_Electron_microscopy_study_Materials_Characterization_2015
Eligibility for repository: Checked on 14/09/2015
Accepted author manuscript, 2.91 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

http://linkinghub.elsevier.com/retrieve/pii/S1044580315002235

Structural Metallic Systems For Advanced Gas Turbine Applications
Bowen, P., Chiu, Y. & Reed, R.
Engineering & Physical Science Research Council
1/10/09 → 30/09/14
Project: Research Councils

Cite this

@article{afd8c1144f3a4969b95951d1853fc15f,

title = "Electron microscopy study of direct laser deposited IN718",

abstract = "The microstructure of direct laser deposited (DLD) IN718 has been investigated in detail using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results confirm that the dendrite core microstructure can be linked to the cooling rate experienced during the deposition. A ~ 100 μm wide δ partially dissolved region in the IN718 substrate was observed close to the substrate/deposit boundary. In the deposited IN718, γ/Laves eutectic constituent is the predominant minor microconstituent. Irregular and regular (small) (Nb,Ti)C carbides and a mixture of the carbides and Laves were observed. Most M3B2 borides were nucleated around a (Nb,Ti)C carbide. Needles of δ phase precipitated from the Laves phase were also observed. A complex constituent (of Laves, δ, α-Cr, γ″, and γ matrix) is reported in IN718 for the first time. The formation of α-Cr particles could be related to Cr rejection during the formation and growth of Cr-depleted δ phase.",

keywords = "IN718, Laser deposition, Microstructure, TEM",

author = "Rengen Ding and ZW Huang and Hangyue Li and I. Mitchell and G. Baxter and P. Bowen",

year = "2015",

month = aug,

doi = "10.1016/j.matchar.2015.06.017",

language = "English",

volume = "106",

pages = "324--337",

journal = "Materials Characterization",

issn = "1044-5803",

publisher = "Elsevier",

}

TY - JOUR

T1 - Electron microscopy study of direct laser deposited IN718

AU - Ding, Rengen

AU - Huang, ZW

AU - Li, Hangyue

AU - Mitchell, I.

AU - Baxter, G.

AU - Bowen, P.

PY - 2015/8

Y1 - 2015/8

N2 - The microstructure of direct laser deposited (DLD) IN718 has been investigated in detail using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results confirm that the dendrite core microstructure can be linked to the cooling rate experienced during the deposition. A ~ 100 μm wide δ partially dissolved region in the IN718 substrate was observed close to the substrate/deposit boundary. In the deposited IN718, γ/Laves eutectic constituent is the predominant minor microconstituent. Irregular and regular (small) (Nb,Ti)C carbides and a mixture of the carbides and Laves were observed. Most M3B2 borides were nucleated around a (Nb,Ti)C carbide. Needles of δ phase precipitated from the Laves phase were also observed. A complex constituent (of Laves, δ, α-Cr, γ″, and γ matrix) is reported in IN718 for the first time. The formation of α-Cr particles could be related to Cr rejection during the formation and growth of Cr-depleted δ phase.

AB - The microstructure of direct laser deposited (DLD) IN718 has been investigated in detail using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results confirm that the dendrite core microstructure can be linked to the cooling rate experienced during the deposition. A ~ 100 μm wide δ partially dissolved region in the IN718 substrate was observed close to the substrate/deposit boundary. In the deposited IN718, γ/Laves eutectic constituent is the predominant minor microconstituent. Irregular and regular (small) (Nb,Ti)C carbides and a mixture of the carbides and Laves were observed. Most M3B2 borides were nucleated around a (Nb,Ti)C carbide. Needles of δ phase precipitated from the Laves phase were also observed. A complex constituent (of Laves, δ, α-Cr, γ″, and γ matrix) is reported in IN718 for the first time. The formation of α-Cr particles could be related to Cr rejection during the formation and growth of Cr-depleted δ phase.

KW - IN718

KW - Laser deposition

KW - Microstructure

KW - TEM

U2 - 10.1016/j.matchar.2015.06.017

DO - 10.1016/j.matchar.2015.06.017

M3 - Article

SN - 1044-5803

VL - 106

SP - 324

EP - 337

JO - Materials Characterization

JF - Materials Characterization

ER -

Electron microscopy study of direct laser deposited IN718

Abstract

Keywords

Access to Document

Fingerprint

Projects

Structural Metallic Systems For Advanced Gas Turbine Applications

Cite this