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Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

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Friction 2014年第1期2卷 82-91页

作者： Puthuparambil Madhavan AJITH Paulraj SATHIYA sivanandam aravindan Department of Production Engineering National Institute of Technology Tiruchirappalli-620015TamilnaduIndia Department of Mechanical Engineering Indian Institute of Technology Delhi New Delhi-110016India

Friction welding is a solid-state joining process which is applied extensively because of its advantages such as low heat input,efficient application,ease in manufacturing,and environmental *** present study investigates the mechanical and metallurgical properties of UNS S32205 duplex stainless steel friction-welded *** process parameters,namely friction pressure,upsetting pressure,and rotational speed are individually varied from low level to high level(within the range of the machine setup)and their effects on the joint properties are *** partial-deformation zone had higher hardness than the weld and base *** toughness of the joints was evaluated at room temperature and at subzero temperature *** impact toughness of the friction-welded joints was found to be superior to fusion-joined duplex stainless steel in room and cryogenic conditions.

关键词： friction welding duplex stainless steel hardness toughness microstructure

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Metallurgical Behaviour and Carbon Diffusion in Buttering Deposits Prepared With and Without Buffer Layers

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Acta Metallurgica Sinica(English Letters) 2017年第2期30卷 120-132页

作者： Dinesh W.Rathod Sunil Pandey sivanandam aravindan Pavan Kumar Singh Department of Mechanical Engineering Indian Institute of Technology Delhi Hauz-Khas New Delhi 110016 India School of MACE University of Manchester Manchester M13 9PL UK Bhabha Atomic Research Centre Mumbai 400085 India

Use of a buttering deposit on ferritic steel in dissimilar metal weld（DMW） joint is a common practice in nuclear plants to connect pressure vessel components（ferritic steel） to pipelines（austenitic stainless steel）.Carbon migration and metallurgical changes near fusion interface（ferritic steel–austenitic stainless steel） lead to a steeper gradient in material properties,and minimizing this gradient is the major challenge in the manufacturing of DMW *** 82 is often deposited on ferritic steel material as buttering to reducing the gradient of physical and attaining material *** 82/182 fillers are used to minimize the carbon migration,but the results are not truly *** this paper,Ni–Fe alloy（chromium-free） has been used as the intermediate buffer layer in the weld buttering deposit to address the issue of carbon migration and subsequent metallurgical *** weld pads with and without buffer layers of Ni–Fe alloy have been investigated and compared in detail for metallurgical properties and carbon ***–Fe buffer layer can significantly control the carbon migration which resists the metallurgical *** showed the better results in postweld heat treatment and thermally aged *** buttering deposit with Ni–Fe buffer layer could be the better choice for DMW joints requirements.

关键词： Dissimilar welds Buttering Carbon diffusion Buffer layer Metallurgical properties

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