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Surface modification of lean duplex stainless steels by low temperature plasma nitriding

Dou, Wenbo (2014)
M.Res. thesis, University of Birmingham.

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Duplex stainless steels (DSS) have been considered as one of new materials for equipment used in the offshore gas and oil industry since these steels possess favourable mechanical and high corrosion-resistance properties. However, the surface hardness and wear resistance of DSS are relatively poor and it had shown that their wear in sea water is a major concern. Improving the wear resistance without losing corrosion resistance was an arduous challenge throughout the surface engineering industry. Recently, a new low-temperature plasma surface alloying technique has been developed to achieve combined improvements in hardness, wear resistance and fatigue properties for austenitic stainless steels without impairing their corrosion behaviour due to the formation of S-phase (Prof. Hanshan Dong, 2010). A great quantity reports have been published about S-phase in austenite stainless steels during the past two decades. A few researches have been reported on formation of S-phase in duplex stainless steels. However, no conclusions have been made and some disputes are still active. Hence, the aim of this project is to study the response of three duplex stainless steels on forming S-phase surface layer by low-temperature plasma nitriding.

Type of Work:M.Res. thesis.
Supervisor(s):Dong, Hanshan and Li, Xiaoying
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:5493
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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