Research on Brazing Process of 40Cr Steel and YG8C Hard Alloy

CHEN Ruibo; HAO Qingle; YANG Lei; LU Hongying; WANG Hui; ZHONG Sujuan; WANG Dezhu

doi:10.7512/j.issn.1001-2303.2025.08.09

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Research on Brazing Process of 40Cr Steel and YG8C Hard Alloy
Vol. 55, Issue 8, Pages: 83-89(2025)
Received：13 February 2025，

Revised：2025-05-30，

Published：20 August 2025
DOI： 10.7512/j.issn.1001-2303.2025.08.09
稿件说明：

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陈睿博，郝庆乐，杨雷，等.40Cr钢与YG8C硬质合金钎焊工艺研究［J］.电焊机，2025，55（8）：83-89. DOI： 10.7512/j.issn.1001-2303.2025.08.09.

CHEN Ruibo, HAO Qingle, YANG Lei, et al.Research on Brazing Process of 40Cr Steel and YG8C Hard Alloy[J].Electric Welding Machine, 2025, 55(8): 83-89. DOI： 10.7512/j.issn.1001-2303.2025.08.09.

摘要

为解决40Cr钢与YG8C硬质合金因物理性能差异导致的钎焊接头强度不足问题，采用感应钎焊技术，以Cu58ZnMn合金为钎料，系统研究了钎焊温度对钎料润湿性、接头微观组织、元素扩散行为及剪切强度的影响规律。结果表明：Cu58ZnMn钎料对两种母材均具有优异润湿性（最大润湿角≤10°），且润湿性随温度升高显著改善；钎焊温度升高可促进元素扩散与固溶体形成，940 ℃以上时双侧界面形成连续扩散带，其中Co元素跨钎层扩散及Fe-Co固溶体的生成是强化接头的关键；接头剪切强度随温度升高先增后减，960 ℃时达到最大值342 MPa，过高温度（980 ℃）会导致40Cr侧出现魏氏组织，引发强度骤降。本研究通过揭示温度调控下的“润湿性-扩散行为-组织强度”关联机制，确定了最佳钎焊工艺参数，为异种材料高强度钎焊连接提供了理论依据与技术参考。

Abstract

To solve the problem of insufficient brazing joint strength caused by the physical property differences between 40Cr steel and YG8C cemented carbide

induction brazing technology was adopted

using Cu58ZnMn alloy as the brazing filler metal

and the effects of brazing temperature on the wettability of the filler metal

the microstructure of the joint

the element diffusion behavior

and the shear strength were systematically studied. The results show that Cu58ZnMn filler metal has excellent wettability for both base materials (maximum wetting angle ≤10°)

and the wettability improves significantly with the increase of temperature; the increase of brazing temperature can promote element diffusion and solid solution formation

and a continuous diffusion band is formed at both sides of the interface above 940℃

in which the diffusion of Co element across the brazing layer and the formation of Fe-Co solid solution are the key to strengthening the joint; the shear strength of the joint increases first and then decreases with the increase of temperature

reaching the maximum value of 342 MPa at 960 ℃

and too high temperature (980 ℃) will cause the appearance of Widmanstätten structure on the 40Cr side

leading to a sharp drop in strength. This study reveals the correlation mechanism of "wettability-diffusion behavior-microstructure strength" under temperature control

determines the optimal brazing process parameters

and provides theoretical basis and technical reference for high-strength brazing connection of dissimilar materials.

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