Achieving ultra-high strength friction stir welded joints of high nitrogen stainless steel by forced water cooling
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第11期
论文作者：H.Zhang D.Wang P.Xue L.H.Wu D.R.N B.L.Xiao Z.Y.Ma
文章页码：2183 - 2188
摘 要：The microstructure and properties of water-cooled and air-cooled friction stir welded（FSW） ultra-high strength high nitrogen stainless steel joints were comparatively studied. With additional rapid cooling by flowing water, the peak temperature and duration at elevated temperature during FSW were significantly reduced. Compared to those in the air-cooled joint, nugget zone with finer grains（900 nm） and heat affected zone with higher dislocation density were successfully obtained in the water-cooled joint,leading to significantly improved mechanical properties. The wear of the welding tool was significantly reduced with water cooling, resulting in better corrosion resistance during the immersion corrosion test.
H.Zhang1,2，D.Wang1，P.Xue1，L.H.Wu1，D.R.N1，B.L.Xiao1，Z.Y.Ma1,2
1. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences2. University of Chinese Academy of Sciences
摘 要：The microstructure and properties of water-cooled and air-cooled friction stir welded（FSW） ultra-high strength high nitrogen stainless steel joints were comparatively studied. With additional rapid cooling by flowing water, the peak temperature and duration at elevated temperature during FSW were significantly reduced. Compared to those in the air-cooled joint, nugget zone with finer grains（900 nm） and heat affected zone with higher dislocation density were successfully obtained in the water-cooled joint,leading to significantly improved mechanical properties. The wear of the welding tool was significantly reduced with water cooling, resulting in better corrosion resistance during the immersion corrosion test.
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