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Study on Processes and Properties of Fe-Al Alloy Layer of 45 Steel by Double-glow Plasma Alloying

Author: GuXueDong
Tutor: YaoZhengJun
School: Nanjing University of Aeronautics and Astronautics
Course: Materials Science
Keywords: Double Glow Aluminized Intermetallic compounds Alloy layer Corrosion Wear and tear
CLC: TG174.445
Type: Master's thesis
Year: 2008
Downloads: 136
Quote: 2
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Abstract


Brittle and difficult to molding temperature hindered Fe-Al intermetallic compounds practical applications , but also enables high-speed arc spraying , laser cladding , plasma spraying , and many other surface aluminized or aluminum craft to develop. However, studies show that these conventional surface diffusion coating processes are there for their shortcomings , resulting in the existence of obtained coating penetration rough surface or substrate binding is not strong and other issues. Therefore this project proposed the use of the double glow plasma surface alloying steel surface preparation technique in 45 Fe-Al alloy layer research . This study is a 45 Double Glow aluminized steel surface technology process and mechanism of the process parameters were optimized microstructure of the alloy layer , structure, composition distribution , phase composition, hardness , bonding strength , corrosion and wear resistance , etc. studied. The results show that : the use of self-designed electrode structure and optimization of process parameters in 45 steel surface with a thickness up to 324μm of Fe-Al alloy layer ; forming an alloy layer surface is smooth, and the substrate metallurgical way to combine ; alloy layer composition gradient distribution , the outermost layer of Al atom concentrations up to 60at.% or more ; alloy layer mainly Fe-rich phase (FeAl, Fe3Al and α-Fe (Al)) dominated ; alloy layer , the deposition layer hardness, the lower hardness of the diffusion layer and the diffusion layer with a uniform depth gradient decreases. In 2.0% Na2S solution and 0.05mol / L Na2SO4 0.5mol / L NaCl mixed solution of these two media , the alloy layer than the corrosion rate much lower steel substrate 45 , with excellent resistance to corrosion ; temperature wear test as the temperature increases, the alloy layer reduces the friction coefficient , wear was reduced , significantly improved abrasion resistance .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal complex layer of protection > The surface alloying ( surface alloying )
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