Fu Juan, Rao Zhipeng, Zhao Yong, Zou Jiasheng, Liu Xin, Pan Yanfei
Provincial Key Lab of Advanced Welding Technology, Jiangsu University of Science and Technology, No. 2 Mengxi Road, Zhenjiang 212003, China.
Jiangsu Changjiang Intelligent Manufacturing Research Institute Co., Ltd., Changzhou 213000, China.
Materials (Basel). 2022 Dec 7;15(24):8741. doi: 10.3390/ma15248741.
In this study, 2205 duplex stainless steel with 12 mm thickness was welded by alternating magnetic field-assisted laser arc hybrid welding. The effect of an alternating magnetic field on the proportion distribution of two phases of the welded joint was investigated. The texture distribution, grain boundary misorientation, and grain size of welded joints were analyzed and characterized. The uniform distribution of alloying elements in the two phases was improved by a 20 mT alternating magnetic field. The diffusion dissolution of Ni and N elements into the γ phase was promoted, which was conducive to the transition from the α to γ phase and reduced the precipitation of CrN, such that the ratio of γ to α was 43.4:56.6. The ratio of the two phases of the weld was balanced by the alternating magnetic field of 30 mT, such that the ratio of γ and α was 44.6:55.4 and the texture dispersion was weakened. The Σ3 twinning boundary of the austenite phase in the weld was transformed to HABs, the ferrite phase underwent dynamic recrystallization, and the austenite phase had a cube texture, copper texture, and goss texture.
在本研究中，采用交变磁场辅助激光电弧复合焊对厚度为12mm的2205双相不锈钢进行焊接。研究了交变磁场对焊接接头两相比例分布的影响。对焊接接头的织构分布、晶界取向差和晶粒尺寸进行了分析和表征。20mT的交变磁场改善了合金元素在两相中的均匀分布。促进了Ni和N元素向γ相的扩散溶解，有利于α相向γ相的转变，减少了CrN的析出，使得γ相与α相的比例为43.4:56.6。30mT的交变磁场使焊缝两相比例达到平衡，γ相与α相的比例为44.6:55.4，织构弥散度减弱。焊缝中奥氏体相的Σ3孪晶界转变为大角度晶界，铁素体相发生动态再结晶，奥氏体相具有立方织构、铜织构和高斯织构。
