Formation of Fe-based glassy matrix composite coatings by laser processing

被引:59
作者
Gargarella, P. [1 ]
Almeida, A. [2 ,3 ]
Vilar, R. [2 ,3 ]
Afonso, C. R. M. [4 ]
Peripolli, S. [5 ]
Rios, C. T. [6 ]
Bolfarini, C. [4 ]
Botta, W. J. [4 ]
Kiminami, C. S. [4 ]
机构
[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, BR-13565905 Sao Carlos, SP, Brazil
[2] Univ Lisbon, Inst Super Tecn, Dept Engn Quim, P-1049001 Lisbon, Portugal
[3] Univ Lisbon, Inst Super Tecn, ICEMS, P-1049001 Lisbon, Portugal
[4] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
[5] INMETRO, Div Metrol Mat, BR-25250020 Rio De Janeiro, RJ, Brazil
[6] Univ Fed ABC, CECS, BR-09210170 Santo Andre, SP, Brazil
关键词
Laser cladding; Fe-based bulk metallic glass alloy; Fe-based bulk metallic glass coatings; Amorphous coatings; BULK METALLIC GLASSES; POWDER DEPOSITION; ALLOY; SOLIDIFICATION; SIMULATION; PLASTICITY; LAYERS; MAPS;
D O I
10.1016/j.surfcoat.2013.12.049
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Coatings of a Fe43.2CO28.8B19.2Nb4Si4.8 alloy on AISI 1020 steel substrates were produced by laser cladding. By properly selecting the processing parameters adherent tracks with negligible dilution could be obtained. For the processing conditions used the clad material presents a graded structure consisting of 5 layers with different microstructures, resulting from the prevalent material solidification path. Solidification starts by epitaxial growth of Fe-Co delta-ferrite on the delta-ferrite resulting from heating of the substrate near the fusion line into the delta-ferrite stability temperature range. This first stage of solidification leads to the formation of consecutive layers consisting predominantly of delta-ferrite and formed by plane front, cellular and columnar dendritic solidification. The solidification of Fe-Co delta-ferrite leads to the segregation of B and Nb first frontally, to the bulk of the liquid, then to the interdendritic regions, resulting in the precipitation of a boride containing eutectic. Initially, the eutectic precipitates in the interdendritic regions, resulting in a layer of material comprised of delta-ferrite dendrites and interdendritic eutectic, then in a layer of material where the eutectic is the bulk alloy constituent. Eventually, a layer of amorphous material with homogeneously dispersed dendrites of Fe-Co delta-ferrite forms in most of the coating thickness. These embedded dendrites form by equiaxed solidification within the supercooled liquid at the trailing edge of the melt pool, from delta-ferrite dendrite fragments and boride particles carried from the growing columnar layer into the liquid bulk by Marangoni convection, driven by the temperature gradients existing within the melt pool. They play a critical role in defining the excellent properties of the coating material: a very high hardness of 1040 +/- 16 HVO.5 associated to a reasonable ductility, allowing the formation of crack-free coatings, in contrast with the bulk alloy prepared by spray forming, either in the as-prepared condition or after laser melting. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:336 / 343
页数:8
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