Temperature distribution in laser-clad multi-layers

被引:42
作者
Jendrzejewski, R
Kreja, I
Sliwinski, G
机构
[1] Polish Acad Sci, Inst Fluid Flow Machinery, PL-80231 Gdansk, Poland
[2] Gdansk Univ Technol, Fac Civil Engn, PL-80952 Gdansk, Poland
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 379卷 / 1-2期
关键词
laser cladding; temperature field modeling; multi-layers;
D O I
10.1016/j.msea.2004.02.053
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Results of temperature distribution modeling for multi-layer structures prepared by direct laser remelting of metal powders in an Ar environment were numerically obtained and compared with experimental data. Powders of bronze B10 and stellite SF6 alloys and also base plates of S235JR steel were taken as sample materials. In the experiment a 1.5 kW cw CO2 laser, equipped with a multi-stream nozzle capable of delivering metal powder at a rate of up to 0.2 g/s coaxially with the laser beam, was used. Dimensions of the melted zone and its position relative to the base were obtained from calculation and agreed with the microstructure observation of the sample cross-sections. The model revealed that isotherms at 1020 and 1350degreesC penetrate the interfaces to a depth of about 5-10% of the individual layer height for B 10 and SF6, respectively. This was confirmed by inspection in a scanning electron microscope (SEM) and also by a depth-dependent X-ray energy-dispersive spectroscopy (XEDS) measurement of the main chemical components of multi-layers, i.e. Fe, Co, Ni (SF6) and Fe, Cu, Sn (B10). Also the cooling rates indicated agreement between modeling acid experiment. This allows us to conclude that the model can be applied for preselecting the process parameters. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:313 / 320
页数:8
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