Investigation on Wettability and Metallurgical and Mechanical Properties of Cemented Carbide and Steel Brazed Joint

2012 ◽  
Vol 445 ◽  
pp. 759-764 ◽  
Author(s):  
Seyed Ali Asghar Akbari Mousavi ◽  
P. Sherafati ◽  
M.M. Hoseinion
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Shear Strength ◽  
Filler Metal ◽  
Microscopic Investigation ◽  
Primary Phase ◽  
Cemented Carbide ◽  
Eutectic Microstructure ◽  
Brazed Joint ◽  
Filler Metals

In this study the wettability, microstructure and mechanical properties of joining between cemented carbide and CK35 steel which brazed with two filler metals, L-Ag40Cd and L-Ag34Cd, were investigated. Wettability test shows that with increase of brazing time, the contact angle decreases and the best situation was resulted in the 20 minute brazing. Microscopic investigation of the brazed area with both filler metal shows that there is a copper enriched primary phase and eutectic microstructure in the silver enriched matrix which composed of copper enriched particles. The amount and the dispersion of precipitates are depended upon type of filler metal and brazing temperature. The results show that brazing with L-Ag34Cd filler metal at 800 °C exhibit superior shear strength in the level of 108 MPa.

scholarly journals Effect of In and Pr on the Microstructure and Properties of Low-Silver Filler Metal

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 929
Author(s):  
Jie Wu ◽  
Songbai Xue ◽  
Peng Zhang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Melting Temperature ◽  
Filler Metal ◽  
304 Stainless Steel ◽  
The Novel ◽  
Spreading Area ◽  
Brazed Joint ◽  
Filler Metals ◽  
Liquidus Temperatures

The novel low-silver 12AgCuZnSn filler metals containing In and Pr were used for flame brazing of copper and 304 stainless steel in this study. The effects of In and Pr content on the melting temperature, wettability, mechanical properties and microstructure of 12AgCuZnSn filler metal were analyzed. The results indicate that the solidus and liquidus temperatures of filler metals decrease with the addition of In. Trace amounts of Pr have little impact on the melting temperature of the low-silver filler metals. In addition, the spreading area of filler metals on copper and 304 stainless steel is improved. The highest shear strength of brazed joint is 427 MPa when the content of In and Pr are 2 wt.% and 0.15 wt.%, respectively. Moreover, it is observed that the trace amount of Pr significantly refines the microstructure of brazed joint matrix. A bright Pr3Cu4Sn4 phase is found in filler metal and brazing seam when the contents of In and Pr are 5 wt.% and 0.5 wt.%, respectively.

scholarly journals Effects of Interfacial Reactions on Microstructures and Mechanical Properties of 3003 Al/T2 Cu and 1035 Al/T2 Cu Brazed Joints

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 248
Author(s):  
Man Zhang
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Stress Concentration ◽  
Joint Strength ◽  
Interfacial Reactions ◽  
Composition Analysis ◽  
Dispersion Strengthening ◽  
Al Content ◽  
Brazed Joints ◽  
Filler Metals

To meet the demand for efficient and reliable copper and aluminum (Cu/Al) joints in refrigeration and electric power industries, interfacial reactions in 3003 Al/T2 Cu and 1035 Al/T2 Cu joints brazed by Zn-xAl (x ranged from 2–25 wt.%) filler metals and their effects on the mechanical properties of the joints were investigated. Microstructures and fracture surfaces were observed combining with composition analysis. For 3003 Al/Cu joints, bulk CuAl and CuAl2 intermetallic compound (IMC) formed in brazing seams, and a CuAl IMC layer formed at the Cu side interfaces. For 1035 Al/Cu joints, bulk CuAl2 IMC formed in brazing seams, and an Al4.2Cu3.2Zn0.7 IMC layer formed at the Cu side interfaces. For both kinds of joints, shear strength increased first, then decreased with the increasing Al content. The increase in shear strength was because Al promoted the formation of Cu-Al IMC, and caused dispersion strengthening. With the excessive Al content, however, the bulk IMC became coarse and the IMC layers at Cu side interfaces grew thick, causing the joint strength to decrease due to stress concentration. The strength of 3003 Al/Cu joints was always higher than that of 1035 Al/Cu, and their highest strength were achieved by Zn-12Al and Zn-15Al, respectively.

Comparative Study on Microstructure and Strength of TiAl/Steel Joints Brazed with Ag-Cu-Ti and Ag-Cu-Zn Filler Metals

2005 ◽  
Vol 502 ◽  
pp. 467-472
Author(s):  
Hui Jie Liu ◽  
Jicai Feng
Keyword(s):  
Shear Strength ◽  
Filler Metal ◽  
Interface Structure ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Vacuum Brazing ◽  
Testing Method ◽  
Interface Structures ◽  
Steel Joints ◽  
Filler Metals

Vacuum brazing of a TiAl-based alloy to a medium-carbon steel has been carried out at 1173 K for 2-40 min using Ag-Cu-Ti and Ag-Cu-Zn filler metals. The formation phases and interface structure or microstructure of the joints were investigated by SEM, EPMA and XRD, and the strength of the joints was determined by the shear testing method. The experimental results indicate that (1) Ti(Cu,Al)2, Ag(s.s.), Ag-Cu eutectic and TiC phases have occurred in the TiAl/steel joints, and their amount changes with the brazing time; (2) the interface structures of the joints brazed with the Ag-Cu-Ti filler metal is TiAl/Ti(Cu,Al)2+ Ag(s.s.)/Ag(s.s.)+Ti(Cu,Al)2/TiC/steel, while the microstructure of the joints brazed with the Ag-Cu-Zn filler metal is composed of a continuous TiC layer and a mixed zone of Ti(Cu,Al)2, Ag(s.s.) and Ag-Cu eutectic; (3) the shear strength of the joints brazed with the Ag-Cu-Ti filler metal monotonously decreases with increasing brazing time, while the shear strength of the joints brazed with the Ag-Cu-Zn filler metal first rises and then decreases, accordingly an optimum brazing time exists; (4) the maximum shear strengths of the TiAl/steel joints brazed with the Ag-Cu-Ti and Ag-Cu-Zn filler metals are 170 and 190 MPa, respectively.

Effect of Ruthenium, Rhenium and Yttria Additions on the Microstructure of Wide Gap Brazing of IN738

2007 ◽  
Author(s):  
Xiao Huang ◽  
Scott Yandt ◽  
Doug Nagy ◽  
Matthew Yao
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Life Cycle Cost ◽  
Filler Metal ◽  
Braze Alloy ◽  
Cost Effective ◽  
Brazed Joints ◽  
Brazed Joint ◽  
Wide Gap ◽  
Boride Phases

Modern gas and steam turbine components are subject to severe thermomechanical loads and extremely high temperature in order to provide increased performance and efficiency. Most high temperature turbine components are made of superalloys specifically developed for high temperature and high mechanical stress applications but at considerable cost. Defects may occur during manufacturing of superalloy castings as well as after service. Repair of these components, rather than replacement, helps to reduce the life cycle cost. Wide gap brazing is a cost effective and reliable means to repair gas turbine hot section components with defect sizes exceeding 0.3 mm. With proper control of the braze alloy and brazing cycle, the repaired region has been reported to posses mechanical properties approaching that of the parent materials. In order to further improve the mechanical properties of the repaired region and to explore the possibility of employing the wide gap brazing method to repair single crystal components in the future, three alloying additions, Ruthenium (Ru), Rhenium (Re) and yttria (Y2O3), were incorporated into the braze filler metal by mechanical alloying. The microstructures of the wide gap brazed joints with Ru, Re and yttria additions were studied and compared to a braze joint with standard wide gap braze alloys of IN738 and AWS BNi-9. It has been found that two types of borides formed in all braze alloys, namely eutectic γ-Ni-rich and boride phases and discrete boride containing primarily Cr and W (or Ru). The addition of Ru to the filler metal did not seem to modify the microstructural constituents after brazing. However, Ru partitioned strongly to the discrete borides. No isolated elemental Ru region was observed. On the other hand, Re addition was found to change the occurrence and distribution of both types of borides. The eutectic boride constituent was significantly reduced and finer discrete boride particles were observed. The addition of yttria did not change the boride formation but led to the generation of more voids in the brazed joint.

scholarly journals Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 198 ◽  
Author(s):  
Peng Xue ◽  
Yang Zou ◽  
Peng He ◽  
Yinyin Pei ◽  
Huawei Sun ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Penetration Depth ◽  
Aging Process ◽  
Filler Metal ◽  
Aging Treatment ◽  
304 Stainless Steel ◽  
Dissimilar Metal ◽  
Brazed Joints ◽  
Brazed Joint

The microstructure and properties of a Cu/304 stainless steel dissimilar metal joint brazed with a low silver Ag16.5CuZnSn-xGa-yCe braze filler after aging treatment were investigated. The results indicated that the addition of Ce could reduce the intergranular penetration depth of the filler metal into the stainless steel during the aging process. The minimum penetration depth in the Ag16.5CuZnSn-0.15Ce brazed joint was decreased by 48.8% compared with the Ag16.5CuZnSn brazed joint. Moreover, the shear strength of the brazed joint decreased with aging time while the shear strength of the AgCuZnSn-xGa-yCe joint was still obviously higher than the Ag16.5CuZnSn joint after a 600 h aging treatment. The fracture type of the Ag16.5CuZnSn-xGa-yCe brazed joints before aging begins ductile and turns slightly brittle during the aging process. Compared to all the results, the Ag16.5CuZnSn-2Ga-0.15Ce brazed joints show the best performance and could satisfy the requirements for cost reduction and long-term use.

Brazeability and mechanical properties of Ag–Cu–Sn brazing filler metals on copper-brazed joint

2014 ◽  
Vol 18 (sup6) ◽  
pp. S6-429-S6-432 ◽  
Author(s):  
D. K. Basri ◽  
L. Sisamouth ◽  
Y. Farazila ◽  
Y. Miyazawa ◽  
T. Ariga
Keyword(s):  
Mechanical Properties ◽  
Brazed Joint ◽  
Filler Metals

Effect of Ti Addition on Shear Strength of Brazing Diamond and Ag Based Filler Alloy

2009 ◽  
Vol 416 ◽  
pp. 264-268 ◽  
Author(s):  
Yan Chen ◽  
Hong Jun Xu ◽  
Yu Can Fu ◽  
Hong Hua Su
Keyword(s):  
Shear Strength ◽  
Filler Metal ◽  
Filler Alloy ◽  
Interface Zone ◽  
Vacuum Brazing ◽  
Interfacial Reaction Product ◽  
Single Crystal Diamond ◽  
Brazed Joint ◽  
Ti Content ◽  
Ti Addition

The shear strength samples of brazed single crystal diamond with the (72Ag–28Cu)–xTi (x=2, 4, 7wt.%) active filler metal were prepared, using vacuum brazing methods. Microstructure evolution of interfacial reaction product and shear strength of the brazed diamond and Ag based filler alloy were studied. The results show that there exits a layer of TiC on the surface diamond in different Ti additions, and the thickness of TiC layer increases with the increase of Ti addition. With the increase of Ti addition, the shear strength of the brazed joint decreases due to the increase of TiC layer thickness and amount of intermetallics. From the results, it was seen that mutual diffusion of C and Ti was effective on the morphology of the interface zone that affected the shear strength of the bonds. To achieve a reliable brazed joint, the Ti content must be controlled under 4wt.%.

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