MICROSTRUCTUR AND MICROHARDNESS OF LASER CLADDING Ni BASED ON COLD ROLLED STEEL

2018 ◽  
Vol 18 (2) ◽  
pp. 201-213
Author(s):  
Maryam A Ali Bash ◽  
Ali M Mustfa ◽  
Ali M Resan ◽  
Firas F Sayyid ◽  
Adnan I Mohammed
Keyword(s):  
Laser Cladding ◽  
Low Carbon Steel ◽  
Growth Zone ◽  
Nominal Composition ◽  
Low Carbon ◽  
Metallurgical Bonding ◽  
Graded Material ◽  
Cold Rolled ◽  
A New Technique ◽  
Small Change

A study is reported of the laser cladding of a nominal composition of Ni 5 wt% Al on coldrolled low carbon steel (0.16 wt% C), using a high power continuous CO2 laser. The severerolled microstructure of steel was changed considerably at the heat affected zones under allspecific energies. The cladded coatings showed the presence of ɣ solid solution and β(NiAlFe) phases. Sound metallurgical bonding with absence of porosity and cracks wasobserved between the substrate and the clad coat at specific energy higher than 80 J/mm2.The ferrite and pearlite microstructure of the substrate was changed to martensite at the regionadjacent to the clad interface. It followed by large grains of austenite/ferrite and pearlite(grain growth zone), fine grains of austenite/ferrite and pearlite (recrystallization zone) andvery small zone of relatively small change of cold structure (recovery zone). The last zonewas confirmed by micro hardness as a recovery zone.This investigation confirms clearly the possibility of formation different structures of graingrowth, recrystallization and recovery at the laser heat affected cold rolled low carbon steel.The observed results suggest the developing of a new technique to obtain tentativefunctionally graded material.

scholarly journals Effect of CO2 Laser Fluence in Cladding Process on the Microstructure of Cold Rolled 0.2 % Carbon Steel

2021 ◽  
Vol 39 (7) ◽  
pp. 1052-1059
Author(s):  
Mohammed J. Kadhim ◽  
Mahdi M. Hanon ◽  
Suhair A. Hussain
Keyword(s):  
Carbon Steel ◽  
Co2 Laser ◽  
Continuous Wave ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Growth Zone ◽  
Low Carbon ◽  
Metallurgical Bonding ◽  
Graded Material ◽  
Cold Rolled

In this article a 1.8kW continuous wave of high power CO2 laser was used to clad of a titular composition of Ni – 10 wt% Al powder on cold rolled 0.2% carbon steel substrate. The feed rate was kept constant after many preliminary claddings at approximately 11 g/min.  In order to produce clads with different specific energies and interaction times, different traverse speeds were used in the range of 1.5 to 12.5 mm/s. The microstructure of substrate was changed at the heat affected zones under the variety of specific energies. The cladded coatings showed the presence of ɣ solid solution and β (NiAlFe) phases. A strong metallurgical bonding produced between the substrate and the clad coat at fluence higher than 48 J/mm2. The changing in microstructure were observed using both microscope and SEM. The microhardness was evaluated using Vickerʼs microhardness test. The microstructure of the substrate was ferrite and pearlite transformed to martensite at the region adjacent to the clad interface. It followed by a three regions can be classified, a grain growth zone (large grains of austenite/ferrite and pearlite), recrystallization zone (fine grains of austenite/ferrite and pearlite) and recovery zone (the structure has a little changes from the structure of low carbon steel). The microhardness testing result showed higher values for the clad regions compared with substrate. This study emphasize the possibility to develop a temporary new graded material.

Microstructure and Properties of Fe-Based Amorphous Composite Coating Prepared by Pulse Laser

2016 ◽  
Vol 849 ◽  
pp. 642-646 ◽  
Author(s):  
Run Sen Jiang ◽  
Yong Tian Wang ◽  
Jin Tang ◽  
Gang Xu ◽  
Zong De Liu
Keyword(s):  
Pulse Laser ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Amorphous Powder ◽  
Nominal Composition ◽  
Low Carbon ◽  
Hardness Tester ◽  
Metallurgical Bonding ◽  
Intrinsic Mechanism ◽  
Increasing Trend

The Fe-based amorphous composite coatings were prepared by pulse laser cladding method. The amorphous powder with the size ranging from 100 to 200 meshes was cladded on the low carbon steel plate,and the nominal composition of the powder was (wt.%) Cr:14.95, Mo:25.7, B:1.24, C:3.45, Y:3.40, Fe:51.29. The microstructure, phase composition and hardness were characterized by XRD, SEM, DSC and semi-automatic Vickers hardness tester in this study, respectively. The results show that the coating which is composed of amorphous and nanocrystal phases has the dense structure and metallurgical bonding with the substrate. The hardness of coatings was about 5 times higher than that of the substrate. With the increase of cladding layer, the average hardness of coating showed an increasing trend, and the intrinsic mechanism was discussed.

Effect of Mo Content on the Corrosion Resistance of Fe-Based Amorphous Composite Coating

2016 ◽  
Vol 849 ◽  
pp. 636-641
Author(s):  
Run Sen Jiang ◽  
Yong Tian Wang ◽  
Lin Hu ◽  
Gang Xu ◽  
Zong De Liu
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Nominal Composition ◽  
Low Carbon ◽  
Laser Cladding Process ◽  
Superior Effect ◽  
Mo Content

A Fe-based amorphous composite coating doped by molybdenum was fabricated by the pulse laser cladding technology. The substrate was a low carbon steel plate. The nominal composition of the powder in the range from 100 to 200 meshes was (wt.%) Cr:14.95, Mo:25.7, B:1.24, C:3.45, Y:3.40, Fe:51.29, which was selected for the laser cladding process. The microstructure, phase composition, hardness and corrosion resistance of the coatings were characterized by means of SEM, EDS, XRD , DSC and potentiodynamic polarization test. The results show that the coating which was composed of amorphous and nanocrystal phases had the dense structure and metallurgical bonding with the substrate, meanwhile with low porosity and cracks. The addition of molybdenum played an important role in improving the corrosion resistance of the coatings. With the increasing content of molybdenum, the hardness had no significant change, while the corrosion resistance of the coatings significantly increased. From the results of polarization curves, the corrosion current density of the coating added 0 wt.% Mo is higher than that of the coatings added 2 wt.% Mo and 10 wt.% Mo. The molybdenum has a superior effect on the corrosion resistance in Fe-based amorphous composite coating.

Laser Assisted High Entropy Alloy Coating on Low Carbon Steel

2019 ◽  
Vol 813 ◽  
pp. 159-164
Author(s):  
Carlos Alberto Souto ◽  
Gustavo Faria Melo da Silva ◽  
Laura Angelica Ardila Rodriguez ◽  
Aline C. de Oliveira ◽  
Kátia Regina Cardoso
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
High Hardness ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
Nominal Composition ◽  
Low Carbon ◽  
High Entropy ◽  
Scan Speed

Coatings with high entropy alloys of the AlCoCrFeNiV system were obtained by selective laser melting on low carbon steel substrates. The effect of the variation of the Fe and V contents as well as the laser processing parameters in the development of the coating were evaluated. The coatings were obtained from the simple powder mixtures of the high purity elemental components in a planetary ball mill. The coatings were obtained by using CO2 laser with a power of 100 W, diameter of 0.16 mm, and scan speed varying from 3 to 12 mm/s. Phase constituents, microstructure and hardness were investigated by XRD, SEM, and microhardness tester, respectively. Wear resistance measurements were carried out by the micro-abrasion method using ball-cratering tests. The coatings presented good adhesion to the substrate and high hardness, of the order of 480 to 650 HV. Most homogeneous coating with nominal composition was obtained by using the higher scan speed, 12 mm/s. Vanadium addition increased hardness and gave rise to a high entropy alloy coating composed by BCC solid solutions. Ball cratering tests conducted on HEA layer showing improvement of material wear resistance, when compared to base substrate, decreasing up to 88% its wear rate, from 1.91x10-6 mm3/Nmm to 0.23x10-6 mm3/Nmm.

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