Microstructure and Extreme Mechanical Properties of Brazing Joints Between Cemented Carbide and Superalloy

LIU Pan; ZHONG Sujuan; PEI Yinyin; ZHANG Guanxing; NIE Mengjie

doi:10.7512/j.issn.1001-2303.2022.11.01

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Microstructure and Extreme Mechanical Properties of Brazing Joints Between Cemented Carbide and Superalloy
Vol. 52, Issue 11, Pages: 1-8(2022)
Received：13 June 2022，

Published：25 November 2022
DOI： 10.7512/j.issn.1001-2303.2022.11.01
稿件说明：

移动端阅览

刘攀，钟素娟，裴夤崟，等.硬质合金与高温合金钎焊界面组织与极端工况下的力学性能［J］.电焊机，2022，52（11）：1-8. DOI： 10.7512/j.issn.1001-2303.2022.11.01.

LIU Pan, ZHONG Sujuan, PEI Yinyin, et al.Microstructure and Extreme Mechanical Properties of Brazing JointsBetween Cemented Carbide and Superalloy[J].Electric Welding Machine, 2022, 52(11): 1-8. DOI： 10.7512/j.issn.1001-2303.2022.11.01.

摘要

随着现代工业的急速发展，常规硬质合金与钢钎焊工具逐渐难以满足复杂极端工作环境的需求，针对此问题，研究了不同钎焊温度（860 ℃~950 ℃）对AgCuNiMn钎料真空钎焊YG6X硬质合金与GH4169高温合金钎焊接头微观组织的影响，测试了860 ℃~950 ℃焊接温度下试样在常温与理论工作温度227 ℃下的抗拉强度，并测试了860 ℃焊接温度下试样的深低温（-238 ℃）抗拉强度。钎缝微观组织主要由Ag基固溶体与Cu基固溶体组成，随着钎焊温度的升高，钎缝中心区Cu基固溶体的数量逐渐减少，钎缝间隙逐渐变窄，两侧界面处Cu基固溶体反应层逐渐变厚，一定程度上提高了钎料与母材的界面结合强度，但同时也使得钎缝处残余应力增加。钎缝在常温下的抗拉强度呈现先升高后降低的趋势，在890 ℃~950 ℃焊接温度区间，227 ℃的拉伸试验温度对接头抗拉强度基本没有影响，在钎焊温度为890 ℃时，平均拉伸强度达到最高值为715.3 MPa。在860 ℃焊接温度下，接头的平均抗拉强度表现为-238 ℃拉伸强度（474.8 MPa）>常温拉伸强度（430.2 MPa）>227 ℃拉伸强度（278 MPa），深低温环境下接头的抗拉强度相较于常温下提高了约10%；由于860 ℃焊接温度相对较低，钎料与母材溶解与扩散程度较低，导致钎料在227 ℃下发生软化，抗拉强度急剧下降。

Abstract

With the rapid development of modern industry

conventional hard aggregate and steel brazing tools are gradually unable to meet the needs of complex extreme working environments. To solve this problem

this paper studied the influence of different brazing temperatures (860 ℃~950 ℃) on the microstructure of the vacuum brazing joint between YG6X cemented carbide and GH4169 superalloy with AgCuNiMn filler metal

and tested the tensile strength of the sample at 860~950 ℃ at room temperature and 227 ℃ the oretical working temperature

and the tensile strength of the samples (860 ℃) deep low temperature (-238 ℃) was tested. The microstructure of the brazing seam is mainly composed of Ag based solid solution and Cu based solid solution. With the increase of brazing temperature

the number of Cu based solid solution in the center of the brazing seam gradually decreases

the gap between the brazing seams gradually narrows

and the reaction layer of Cu based solid solution at the interface on both sides gradually thickens

which improves the interface bonding strength between the filler metal and the base metal to some extent

but also increases the residual stress at the brazing seam. The tensile strength of the brazed joint at room temperature shows a trend of first increasing and then decreasing. In the welding temperature range of 890 ℃~950 ℃

the tensile test temperature of 227 ℃ has little effect on the tensile strength of the joint. When the brazing temperature is 890 ℃

the average tensile strength reaches the highest value of 715.3 MPa. Under 860 ℃ welding temperature

the average tensile strength of the joint is -238 ℃ tensile strength (474.8 MPa)>room temperature tensile strength (430.2 MPa)>227 ℃ tensile strength (278 MPa). The tensile strength of the joint under deep and low temperature environment is about 10% higher than that under room temperature. As the weldly temperature at 860 ℃ is relatively low

the dissolution and diffusion of solder and base metal are relative low

the solder is softened at 227 ℃

resulting in a sharp drop in tensile strength.

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