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  

Effect of Annealing on Microstructure Evolution and Element Distribution of Welded Joint of Bimetal Band Saw Blade

作　　者：刘欢 罗琳 王其龙 郝泽才 陈新武 李树松 杨全毅 LIU Huan;LUO Lin;WANG Qilong;HAO Zecai;CHEN Xinwu;LI Shusong;YANG Quanyi(China Petroleum Engineering And Construction North China Company,Renqiu 062552 China;Zhenhua Petroleum Holding Co.,Ltd.,Xicheng District,Beijing 100031 China)

机构地区：[1]中国石油工程建设有限公司华北分公司,河北任丘062552 [2]振华石油控股有限公司,北京100031

出　　处：《电焊机》2024年第7期105-109,共5页Electric Welding Machine

摘　　要：双金属带锯条由M42高速钢齿材和B2000高强度钢背材焊接而成,焊接后易产生焊接热应力,影响其焊缝性能。研究了双金属带锯条焊接接头经过820℃(退火炉中)退火再随炉冷却后的组织演变和元素分布规律。结果表明,退火后的焊缝组织由柱状晶逐渐演变为碳化物球化,Mo、Cr、V、W等合金元素与C形成碳化物并逐渐球化,导致合金元素在接头处团聚。此外,退火过程中元素扩散系数增大,使得双金属带锯条的母材中的元素向焊缝中扩散,形成了M_(6)C型、M_(23)C_(6)型和MC型碳化物,降低了焊缝硬度。该研究结果为双金属带锯条焊接接头的退火工艺优化提供了理论依据,有助于提高双金属带锯条的质量和使用寿命。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 gradually spheroidize,leading to the agglomeration of alloying elements at the joint.Moreover,the increased element diffusion coefficient during annealing causes the elements in the base metal of the bimetal bandsaw blade to diffuse into the weld,forming 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.

关 键 词：双金属带锯条 退火 焊接接头 碳化物球化 元素分布 

分 类 号：TG401[金属学及工艺—焊接]