退火对双金属带锯条焊接接头组织演变及元素分布规律的影响OACSTPCD

The bimetal bandsaw blade is welded with M42 high-speed steel tooth material and B2000 high-strength steel back material.The tooth material has high red hardness and strength,while the back material has good toughness.However,welding can easily generate thermal stress,affecting the performance of the weld.This study investigates the microstructure evolution and element distribution of the welded joint of the bimetal bandsaw blade after annealing at 820℃(in a annealing furnace)and then cooling with the furnace.The results show that the microstructure of the weld evolves from columnar grains to spheroidized carbides after annealing.Alloying elements such as Mo,Cr,V,and W form carbides with C and gradu-ally spheroidize,leading to the agglomeration of alloying elements at the joint.Moreover,the increased element diffusion co-efficient during annealing causes the elements in the base metal of the bimetal bandsaw blade to diffuse into the weld,form-ing M6C,M23C6,and MC type carbides,which reduce the hardness of the weld.This research provides a theoretical basis for the optimization of the annealing process of the welded joint of bimetal bandsaw blades,which can help improve the quality and service life of bimetal bandsaw blades.