近年来,在动力、化学和炼油等設备中,异种鋼的焊接接头,特別是奥氏体和珠光体鋼的焊接接头,得到了比較广泛的应用。但是,奥氏体和珠光体鋼焊接結构的生产和使用实践表明,在这种接头焊接、热处理或者工作过程中,沿着熔合綫可能产生裂縫造成局部脆断。脆断的基本原因之一是,在焊 In recent years, in the power, chemical and oil refining equipment, dissimilar steel welded joints, especially the austenitic and pearlite steel welded joints, has been more widely used. However, the production and use practices of austenitic and pearlite steel welded structures indicate that there may be cracks in the weld lines that cause localized brittleness during such joint welding, heat treatment or work. One of the basic causes of brittle fracture is in welding