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

LIU Huan; LUO Lin; WANG Qilong; HAO Zecai; CHEN Xinwu; LI Shusong; YANG Quanyi

doi:10.7512/j.issn.1001-2303.2024.07.15

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Effect of Annealing on Microstructure Evolution and Element Distribution of Welded Joint of Bimetal Band Saw Blade
Vol. 54, Issue 7, Pages: 105-109(2024)
Received：11 January 2024，

Revised：2024-05-23，

Published：25 July 2024
DOI： 10.7512/j.issn.1001-2303.2024.07.15
稿件说明：

移动端阅览

刘欢，罗琳，王其龙，等.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［J］.电焊机，2024，54（7）：105-109. DOI： 10.7512/j.issn.1001-2303.2024.07.15.

LIU Huan, LUO Lin, WANG Qilong, et al.Effect of Annealing on Microstructure Evolution and Element Distribution of Welded Joint of Bimetal Band Saw Blade[J].Electric Welding Machine, 2024, 54(7): 105-109. DOI： 10.7512/j.issn.1001-2303.2024.07.15.

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

C型、M

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。

Abstract

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

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

Keywords

references

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