An improved process scan strategy to obtain high-performance fatigue properties for Scalmalloy

被引:14
作者
Schimbaeck, D. [1 ]
Mair, P. [2 ]
Kaserer, L.
Perfler, L. [3 ]
Palm, F. [4 ]
Leichtfried, G. [2 ]
Pogatscher, S. [1 ]
机构
[1] Univ Leoben, Chair Nonferrous Met, Leoben, Austria
[2] Univ Innsbruck, Fac Engn Sci, Dept Mechatron, Mat Sci, Innsbruck, Austria
[3] Univ Innsbruck, Fac Engn Sci, Dept Struct Engn & Mat Sci, Innsbruck, Austria
[4] Airbus Def & Space GmbH, Airbus Cent R&T, Taufkirchen, Germany
关键词
Laser Powder Bed Fusion; Scalmalloy; Fatigue; Parameter Study; Welding Mode; MECHANICAL-PROPERTIES; LASER; ALLOY; SLM; MICROSTRUCTURE; BEHAVIOR; FEATURES; POROSITY; BIFILMS; FUSION;
D O I
10.1016/j.matdes.2022.111410
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The choice of appropriate processing parameters in laser powder bed fusion is firmly established in the state-of-the-art additive manufacturing community. However, optimisation of scanning strategy would result in improved material properties. Here, the optimal scanning strategy for fatigue-loaded high-performance aluminium alloys, such as Scalmalloy (R), was investigated. This study demonstrates how to reduce uncontrolled interactions of the laser with the distinct weld plume, created by highly volatile alloying elements such as Mg. Tensile and fatigue testing were used to assess the structural integrity of specimens, in which different welding modes had been used. It is shown that a combination of: scan vector angle restriction; reduction of the scan vector length; and laser spot adjustments reduce the over-all defect size and improves the build quality in Scalmalloy (R). A bimodal microstructure with outstanding mechanical properties was observed: an ultimate tensile strength of 524 MPa was achieved with 17 % elongation at fracture. In order to evaluate the influence of the defect size, fatigue tests were performed at a stress ratio of R = 0.1. Under optimal processing conditions, fatigue strengths of up to 360 MPa at 3 . 107 cycles were obtained, significantly outperforming both conventionally and additively produced aluminium alloys.(c) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
引用
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页数:11
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