Crystallographic texture and microstructure of pulsed diode laser-deposited Waspaloy

被引：62

作者：

Moat, R. J. ^{[1
]}

Pinkerton, A. J. ^{[2
]}

Li, L. ^{[2
]}

Withers, P. J. ^{[1
]}

Preuss, M. ^{[1
]}

机构：

[1] Univ Manchester, Sch Mat, Manchester M1 7HS, Lancs, England

[2] Univ Manchester, Sch Mech Aerosp & Civil Engn, Manchester M60 1QD, Lancs, England

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

Laser direct metal deposition (LDMD); Nickel alloys; Texture; Near-net shape manufacture; Electron backscatter diffraction; METAL-DEPOSITION; GROWTH;

D O I：

10.1016/j.actamat.2008.11.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The role of both laser Pulse length and duty cycle in controlling the grain size and crystallographic texture of diode laser-deposited Waspaloy powder is investigated. Thin-walled test structures of Waspaloy have been produced Using a range of pulse parameters and analyzed by means of scanning electron microscopy and electron backscatter diffraction. Results have been correlated with a simple analytical model of the effect of the laser pulse oil the substrate temperature and melt-pool geometry in order to help explain the trends observed. Findings show that Pulse parameters have a marked effect oil the resulting grain morphology and crystallographic orientation. Modelling has indicated that this arises because the microstructure Lire is highly dependent oil the melt-pool geometry, particularly the inclination angle of the melt-pool boundary. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1220 / 1229

页数：10

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