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首页> 外文期刊>Journal of Materials Engineering and Performance >Characteristics of Laser Beam and Friction Stir Welded AISI 409M Ferritic Stainless Steel Joints
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Characteristics of Laser Beam and Friction Stir Welded AISI 409M Ferritic Stainless Steel Joints

机译：激光和摩擦搅拌焊接AISI 409M铁素体不锈钢接头的特性

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摘要

This article presents the comparative evaluation of microstructural features and mechanical properties of friction stir welded (solid-state) and laser beam welded (high energy density fusion welding) AISI 409M grade ferritic stainless steel joints. Optical microscopy, microhardness testing, transverse tensile, and impact tests were performed. The coarse ferrite grains in the base material were changed to fine grains consisting duplex structure of ferrite and martensite due to the rapid cooling rate and high strain induced by severe plastic deformation caused by frictional stirring. On the other hand, columnar dendritic grain structure was observed in fusion zone of laser beam welded joints. Tensile testing indicates overmatching of the weld metal relative to the base metal irrespective of the welding processes used. The LBW joint exhibited superior impact toughness compared to the FSW joint.
机译：本文介绍了搅拌摩擦焊接（固态）和激光束焊接（高能量密度熔焊）AISI 409M级铁素体不锈钢接头的显微组织特征和力学性能的比较评估。进行了光学显微镜，显微硬度测试，横向拉伸和冲击测试。由于迅速的冷却速度和摩擦搅拌引起的严重塑性变形所引起的高应变，基体材料中的粗大铁素体晶粒变成了由铁素体和马氏体的双重结构组成的细晶粒。另一方面，在激光焊接头的熔合区观察到柱状树枝状晶粒结构。拉伸测试表明，无论使用何种焊接工艺，焊接金属相对于母材的过度匹配。与FSW接头相比，LBW接头具有更高的冲击韧性。

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