Liquation cracking in fiber laser welded joints of inconel 617》.pdfVIP

Journal of Materials Processing Technology 226 (2015) 214–220 Contents lists available at ScienceDirect Journal of Materials Processing Technology j o u rn al h omepage: w w w. elsev /locate/jmat protec Liquation cracking in fiber laser welded joints of inconel 617 Wenjie Ren a , Fenggui Lu a , Renjie Yang b , Xia Liu c , Zhuguo Li a,∗ a Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China b Shanghai Turbine Works Company, Shanghai 200240, PR China c Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, PR China a r t i c l e i n f o a b s t r a c t Article history: Liquation cracking in the fiber laser welding Inconel 617 joint under different heat input and preheating Received 14 January 2015 conditions was systemically investigated. Liquation cracking is prevalent in the necking region of the Received in revised form 7 July 2015 welded fusion zone. The liquation of the grain boundaries (GBs) is mainly caused by the constitutional Accepted 8 July 2015 liquation of M23 (C,B)6 carbides. The continuous (Cr, Mo)-rich phase is re-solidified due to the continuous Available online 18 July 2015 liquid film along GBs during the solidification. The continuous (Cr, Mo)-rich phase decreases as the heat input and preheating temperature increases. The presence of the GB resolidified phase around liquation Keywords: