MICROSTRUCTURE AND MECHANICAL PROPERTIES OF LASER BEAM WELDED AISI 409M GRADE FERRITIC STAINLESS STEEL JOINTS
Keywords:
Laser Beam Welding, Ferritic Stainless Steel, Tensile Property, Impact PropertyAbstract
This paper deals with the microstructure analysis and mechanical properties evaluation of laser beam welded AISI 409M ferritic stainless steel joints. Single pass autogeneous welds free of volumetric defects were produced at a welding speed of 3000 mm/min. The joints were subjected to optical microscopy, scanning electron fractography, microhardness, transverse and longitudinal tensile, bend and charpy impact toughness testing. The coarse ferrite grains in the base metal were changed into dendritic grains as a result of rapid solidification of laser beam welds. Tensile testing indicates overmatching of the weld metal relative to the base metal. The joints are also exhibited acceptable impact toughness and bend strength properties
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