Prepartion of Al-Mn Alloy Coatings on Low Carbon Steel by Hot-Dip-Aluminizing

2011 ◽  
Vol 117-119 ◽  
pp. 1121-1124 ◽  
Author(s):  
Xin Mei Li ◽  
Bing Liu ◽  
Xiao Feng Dong ◽  
Qing Yu ◽  
Qiao Yu Xu
Keyword(s):  
Phase Composition ◽  
Carbon Steel ◽  
Intermetallic Compound ◽  
Coating Layer ◽  
Low Carbon Steel ◽  
Alloy Layer ◽  
Low Carbon ◽  
Molten Bath ◽  
Coating Layers ◽  
Aluminide Layer

Low carbon steel were coated by hot-dipping into a molten bath containing Al-2 wt%Mn, Al-9wt%Mn, Al-13wt%Mn, respectively. The phase composition, morphology and the adhesion of the aluminide layer were characterized by XRD, SEM, EDAX, OM and scratch tester. The results show that the coating layers is mainly composed of Al, FeAl3, Fe2Al5 and MnAl6 phase. The coatings consists of two-layers structure, i.e., topcoat Al-Mn alloy layer and tongue-like intermetallic compound, and the coating layer is about 800 μm thick. The adhesion of the Al-Mn alloy coatings were characterized by Lc value and were found to be about ~30N. The adhesion gradually decrease with the increase of the Mn contents in alloy coatings.

Microstructure and Erosion-Corrosion Behavior of Hot-Dipping Al-Mn Alloy Coatings on Low Carbon Steel

2011 ◽  
Vol 266 ◽  
pp. 246-249
Author(s):  
Xin Mei Li ◽  
Ping Kuan Lu ◽  
Qiang Hu ◽  
Xiao Feng Dong ◽  
Bei Jing Fang
Keyword(s):  
Carbon Steel ◽  
Corrosion Behavior ◽  
Layer Structure ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Alloy Layer ◽  
Low Carbon ◽  
Good Adhesion ◽  
Erosion Corrosion ◽  
Aluminide Layer

Low carbon steel was coated by hot-dipping into a molten bath containing Al-2 wt.%Mn. The phase composition, morphology and the erosion-corrosion behavior of the aluminide layer were characterized by XRD, OM, SEM and erosion-corrosion tester, respectively. The results show that the coatings are mainly composed of Al, FeAl3, Fe2Al5 and MnAl6 phase. The coatings consist of two-layer structure, i.e., toplayer Al-Mn alloy layer and tongue-like intermetallic compound. The thickness of the coating layer is about 800 μm and all the coating layers show good adhesion to the steel substrate. Compared with the pure Al coatings, the Al-Mn alloy coatings exhibit lower wear rate irrespective of the rotation speed. The hot-dipped Al-Mn coatings possess considerable erosion-corrosion resistance.

Structure and phase composition of cobalt rich coating prepared by laser cladding on low carbon steel

1993 ◽  
Vol 9 (2) ◽  
pp. 172-175 ◽  
Author(s):  
N. Pizúrová ◽  
J. Komurka ◽  
M. Svoboda ◽  
O. Schneeweiss
Keyword(s):  
Phase Composition ◽  
Carbon Steel ◽  
Laser Cladding ◽  
Low Carbon Steel ◽  
Low Carbon

High Temperature Corrosion of Al Hot-Dipped Low Carbon Steels in N2/H2S-Mixed Gases

2016 ◽  
Vol 369 ◽  
pp. 59-64
Author(s):  
Muhammad Ali Abro ◽  
Dong Bok Lee
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Alloy Layer ◽  
High Temperature Corrosion ◽  
Carbon Steels ◽  
Low Carbon ◽  
Mixed Gas ◽  
Low Carbon Steels ◽  
Mixed Gases

A low carbon steel was hot-dip aluminized, and corroded in the N2/0.4%H2S-mixed gas at 650-850°C for 20-50 h in order to find the effect of aluminizing on the high-temperature corrosion of the low carbon steel in the H2S environment. A thin Al topcoat and a thick Al-Fe alloy layer that consisted primarily of Al5Fe2 and some FeAl and Al3Fe formed on the surface after aluminizing. The corrosion rate increased with an increase in temperature. Hot-dip aluminizing increased the corrosion resistance of the carbon steel through forming a thin protective α-Al2O3 scale on the surface. The α-Al2O3 scale was susceptible to spallation. During corrosion, internal voids formed in the Al-Fe alloy layer, where the Al5Fe2, AlFe, and Al3Fe compounds gradually transformed through interdiffusion.

SEM Studies on the Microstructure and Phase Composition Distribution in Cr3C2 + TiC Claddings on Low-Carbon Steel

2020 ◽  
Vol 303 ◽  
pp. 59-66
Author(s):  
Konstantin V. Ivanov ◽  
Vladimir E. Ovcharenko
Keyword(s):  
Electron Microscopy ◽  
Phase Composition ◽  
Carbon Steel ◽  
Structural Parameters ◽  
Low Carbon Steel ◽  
Relativistic Energy ◽  
Low Carbon ◽  
Composition Distribution ◽  
X Ray ◽  
Scanning Electron

Using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) we studied the distribution of structural parameters, phase composition and alloying elements concentration across the coatings obtained by cladding of chromium and titanium carbides mixture on low-carbon steel. The beam of relativistic energy electrons extracted into the atmosphere was used to form the coatings. The homogeneity in the allying elements distribution is shown to be defined by the lifetime of the melt bath while the phase composition distribution depends on the thickness of the melt layer. Both above parameters are determined by the density of the entered energy.

Effects of Cr-Mo Infiltration Source Cathode Different Mixing Proportion on the Thickness of Alloy Layer

2011 ◽  
Vol 704-705 ◽  
pp. 1006-1010
Author(s):  
Jing Chun Zhang ◽  
Jin Yong Xu ◽  
Yong Yong Deng ◽  
Ya Juan Liu ◽  
Cheng Gao
Keyword(s):  
Carbon Steel ◽  
Plasma Nitriding ◽  
Low Carbon Steel ◽  
Alloy Layer ◽  
Work Piece ◽  
Composition Analysis ◽  
Low Carbon ◽  
Technological Parameters ◽  
Plasma Surface ◽  
Microstructure Observation

Based on the plasma nitriding technique, the double glow plasma surface metallurgy (DG-PSM) technology was developed. This technology is also known as the Xu-Tec Process which utilizes solid metallic elements such as Ni, Cr, Mo, W, Ti, Al, Nb, Zr and their combinations to accomplish plasma surface alloying. Mo-Cr strengthened coating was prepared on the surface of low carbon steel Q235 by this technology. This coating is used to high wear resistant cold die LD steel. By experiment of the three different prescriptions in source cathode, the effect of source cathode composition on the coating has been studied. The technological parameters were as follows: The ratio of Mo and Cr were 2:1, 4:1 and 6:1. The work-piece material is Q235 low carbon steel. Holding time is 4h. Holding temperature 1050°C.Source cathode structure was threadiness. The consequences of composition analysis and microstructure observation results show that, most approaches the purpose of this research is the ratio of Mo and Cr is 6:1, and the alloyed layer has stronger adhesion with substrate.

Laser Roll Welding of Dissimilar Metal Joint of Titanium to Low Carbon Steel

2008 ◽  
Vol 580-582 ◽  
pp. 543-546 ◽  
Author(s):  
Hitoshi Ozaki ◽  
Reiji Ichioka ◽  
Takashi Matsuura ◽  
Muneharu Kutsuna
Keyword(s):  
Carbon Steel ◽  
Intermetallic Compound ◽  
Low Carbon Steel ◽  
Weight Ratio ◽  
High Strength ◽  
Low Carbon ◽  
Tensile Shear ◽  
Dissimilar Metal ◽  
Metal Joint ◽  
Structural Panel

Titanium is one of structural materials. It has several advantages such as high corrosion resistance and high strength-to-weight ratio. The demand of titanium structural panel and the dissimilar joint has been increased in industry. It is well known that joining of steel and titanium is difficult because of generating the brittle intermetallic compound. In the present work, the laser roll welding of dissimilar metals, titanium to low carbon steel been investigated using a 2.4kW CO2 laser and a 2kW fiber laser. The effects of process parameters on the formation of intermetallic compound at the interlayer and on the mechanical properties were investigated to get a sound dissimilar metal joint. As a result, welded joints of titanium to low carbon steel were broken in the base metal of low carbon steel in the tensile-shear test.

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