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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Development and Mechanical Properties of Friction Stir Welded Ferritic Stainless Steel AISI 409
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Microstructural Development and Mechanical Properties of Friction Stir Welded Ferritic Stainless Steel AISI 409

机译：摩尔铁焊铁素体不锈钢AISI 409微观结构开发与力学性能

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摘要

This work investigates the effect of friction stir welding process parameters (rotation rate and traverse speed) on the microstructural evolution of friction stir welded (FSWed) ferritic stainless steel (FSS) AISI 409. Optical microscope, scanning electron microscope and electron backscattering diffraction are used to quantitatively assess the development in grain structure and texture. The microstructural development suggested that thermo-mechanical deformation occurs in the stir zone within the austenite/ferrite phase region, ultimately transforming upon cooling into bainitic/ferritic microstructure. The fraction and size of the bainitic/ferritic grains are found to vary through the thickness of the joints. High fractions of coarse ferritic grains are found near the top of the stir zone, and low fraction of fine ferritic grains is found near the bottom of the stir zone. This bainitic/ferritic grain structure resulted in an increase in the hardness of the stir zone by about 74% relative to the base material. The tensile strength of the FSWed FSS joints is almost at the same level of the base material with reduction in the ductility as a result of the increased hardness of the weld zone.
机译：该工作调查了摩擦搅拌焊接工艺参数（旋转速率和横向速度）对摩擦搅拌焊接（FLWED）铁素体不锈钢（FSS）AISI 409的微观结构演进的影响。光学显微镜，扫描电子显微镜和电子背散射衍射定量评估晶粒结构和质地的发展。微观结构的发展表明，在奥氏体/铁氧体相区域内的搅拌区中发生热机械变形，最终在冷却到贝氏体/铁素体微结构时转化。发现贝氏体/铁素物晶粒的分数和尺寸在接头的厚度上变化。在搅拌区的顶部附近发现粗晶粒的高级分，并且在搅拌区的底部附近发现了低馏分的细铁晶粒。该诱导/铁素体晶粒结构导致搅拌区的硬度增加相对于基材的约74％。由于焊接区的硬度增加，FSWED FSS接头的拉伸强度几乎处于基材的延续率的降低。

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