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Influence of shielding gas on the mechanical and metallurgical properties of DP-GMA-welded 5083-H321 aluminum alloy

International Journal of Minerals,Metallurgy and Materials 2016年第12期23卷 1416-1426页

作者： Amin Reza Koushki Massoud Goodarzi Moslem Paidar Department of Metallurgy and Materials Engineering Iran University of Science and technology Department of Materials Engineering South Tehran Branch Islamic Azad University

In the present research, 6-mm-thick 5083-H321 aluminum alloy was joined by the double-pulsed gas metal arc welding （DP-GMAW） process. The objective was to investigate the influence of the shielding gas composition on the microstructure and properties of GMA welds. A macrostructural study indicated that the addition of nitrogen and oxygen to the argon shielding gas resulted in better weld penetration. Furthermore, the tensile strength and bending strength of the welds were improved when oxygen and nitrogen （at concentrations as high as approximately 0. 1vol%） were added to the shielding gas; however, these properties were adversely affected when the oxygen and nitrogen contents were increased further. This behavior was attributed to the formation of excessive brown and black oxide films on the bead surface, the formation of intermetallic compounds in the weld metal, and the formation of thicker oxide layers on the bead surface with increasing nitrogen and oxygen contents in the argon-based shielding gas. Analysis by energy-dispersive X-ray spectroscopy revealed that most of these compounds are nitrides or oxides.

关键词： aluminum alloys gas metal arc welding shielding gas mechanical properties metallurgical properties

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Study on metallurgical properties and pellet proportioning technology of stainless steel cold-rolling sludge

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Baosteel Technical Research 2012年第2期6卷 21-26页

作者： SHI Lei CHEN Ronghuan WANG Ruyi Ironmaking and Sustainability Division Research InstituteBaoshan Iron&Steel Co.Ltd.Shanghai 201900China

With a complicated composition, large rolling sludge has been a focal point concerning neither at home nor abroad have any technologies suitable for bulk utilization of stainless steel cold- production and serious damage to the environment, stainless steel cold- environmental protection for stainless steel enterprises. Up to now, come into being that are not only proper, safe and economical but also rolling sludge. Based on the characteristics of the stainless steel cold- rolling sludge, orthogonal experiments were carried out on pellet proportioning and high-temperature roasting, and major metallurgical properties of sludge pellets were also tested. As the results show, pellets with 30% addition of cold-rolling sludge are qualified regarding their compressive strength, chemical composition and major metallurgical properties. No adverse impact happens to the blast furnace operation when sludge pellets account for 10% of the blast furnace raw materials. Therefore, the technical route applied in this paper is proved simple, feasible and environmentally friendly for cold-rolling sludge treatment.

关键词： stainless steel cold-rolling sludge pellet proportioning metallurgical properties

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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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