Low Alloy Steel Welding with Micro-Jet Cooling

Archives of Metallurgy and Materials

T. Węgrzyn¹  J. Piwnik² 

[1] Faculty of Transport, Silesian University of Technology, 40-019 Katowice, 8 Krasi?skiego Str., Poland;Mechanical Faculty, Bia?Ystok University of Technology, 15-351 Bia?Ystok, 45A Wiejska Str., Poland

关键词: Keywords: micro-jet cooling;    weld;    metallographic structure;    acicular ferrite;    impact toughness;   

DOI  :  10.2478/v10172-012-0056-x

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Low alloy steel is used for many important structures. In that material there is a small amount of carbon and controlled percentage of alloy elements such as Ni, Mn, Mo, Si in steel and welded joints. Especially Ni, Mo, O could be treated as elements positively influencing impact toughness of welded structures. Metallographic structure of weld metal deposit (WMD) having composition of 400 ppm O and 2% Ni or 0.4% Mo and is very beneficial because of high percentage of acicular ferrite (until 65%) and thus WMD has good mechanical properties. For a long time researchers were putting two questions: how to lift percentage of AF in weld, and further what consequence that fact gives? Micro-jet technology could be treated as a chance to resolve that problem. The present paper describes the influence of artificially lifted amount of acicular ferrite in WMD (above 65%) on the behaviour of steel weld properties using micro-jet cooling.

【 授权许可】

Unknown