Effects of Ni and Co Additions to Filler Metals on Ag-Brazed Joints of Cemented Carbide and Martensitic Stainless Steel

2014 ◽  
Vol 922 ◽  
pp. 322-327 ◽  
Author(s):  
Kengo Kaiwa ◽  
Shinji Yaoita ◽  
Tomohiro Sasaki ◽  
Takehiko Watanabe
Keyword(s):  
Stainless Steel ◽  
Joint Strength ◽  
Martensitic Stainless Steel ◽  
Braze Alloy ◽  
Cemented Carbide ◽  
Suppression Effect ◽  
Brazed Joints ◽  
Co Addition ◽  
Multiple Addition ◽  
Filler Metals

This study focuses on understanding the effect of Ni and Co additions to filler metals on Ag-brazed joints of cemented carbide and martensitic stainless steel. Ni and Co added braze alloys were processed based on Ag-Cu-Zn ternary alloy, and joint strength and microstructure of the brazed layer has been investigated. The joint strength increased by the 2.0mass%Ni and 0.5mass%Co addition into braze alloy. This trend is remarkable in the Co added alloy, and the brazed joint increased by 141% compared to that in no-added alloy. The joint strength was closely related to the suppression effect of Co dissolution from cemented carbide into filler layer and Fe diffusion from the stainless steel to the brazed layer. In the brazed microstructure, Co-depleted zone caused by dissolution of Co in the cemented carbide was observed near the interface between the cemented carbide and the steel. Width of the Co-depleted zone significantly decreased in the Co added alloy. However, the joint strength decreased in the multiple addition compared to that in the single addition of Ni or Co.

Mechanical Properties and Microstructure of SUS304 Brazed Joint with Ni-Based Filler Metals Added Cr Powder

2005 ◽  
Vol 297-300 ◽  
pp. 2767-2771
Author(s):  
Ikuo Shohji ◽  
Satoshi Takayama ◽  
Takanori Nakazawa ◽  
Ken Matsumoto ◽  
Masanori Hikita
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Joint Strength ◽  
Brazed Joints ◽  
Brazed Joint ◽  
Filler Metals

In the brazed joint of stainless steel with BNi-2 filler, brittle Cr-B compounds form in the vicinity of the centerline of the brazed joint. These compounds cause a decrease in joint strength. In this study, BNi-2 filler supplemented with Cr powder has been used in brazing stainless steel in orde r to disperse brittle Cr-B compounds uniformly in the brazed joint and improve joint strength. The mechanical properties and microstructures of the brazed joints were investigated. Moreover, a comp arison of the brazed joint with that using the BNi-2 filler was conducted.

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.

Properties of Silver Brazing Alloys Containing Lithium / Właściwości Spoiw Srebrnych Do Lutowania Twardego Z Dodatkiem Litu

2012 ◽  
Vol 57 (4) ◽  
pp. 1087-1093 ◽  
Author(s):  
W. Gąsior ◽  
A. Winiowski
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Shear Strength ◽  
Tensile Test ◽  
Beneficial Effect ◽  
Braze Alloy ◽  
Silver Alloys ◽  
Wetting Properties ◽  
Slag Inclusions ◽  
Brazed Joints

The analysis of the influence of lithium on wetting properties of Ag-Cu brazing alloys and the shear strength of stainless steel/braze/stainless steel joint was conducted. The brazing alloys of designations and composition according to ANSI/AWS A5.8: BAg-8a (71÷3 wt.% Ag, 0.25÷0.50 wt.% Li, Cu) and BAg-19 (92÷93 wt.% Ag, 0.15÷0.30 wt.% Li, Cu) and a braze alloy containing 70÷72 wt.% Ag, 0.6÷0.7 wt.% Li and Cu were subjected to the investigations. The wettability properties of the brazing silver alloys were examined in a spread test. The shear strength of joints were measured on the joints of stainless steel in the tensile test. The comparison of results showed a beneficial effect of lithium on the spreading properties and the wettability of braze alloys as well as the quality and shear strength of the brazed joints. The observed slag inclusions in the solid braze did not affect considerably the mechanical properties of the prepared joints because of the intensive deoxidation of the brazing surfaces of stainless steel elements.

Effect of Tin Content on the Microstructure and Property of Brazed WC-Co/CrMo Alloy Steel Joints

2008 ◽  
Vol 47-50 ◽  
pp. 596-599
Author(s):  
Hsin Fu Wang ◽  
Liu Ho Chiu ◽  
Heng Chang
Keyword(s):  
Shear Strength ◽  
Braze Alloy ◽  
Alloy Layer ◽  
Vacuum Brazing ◽  
Cu Alloy ◽  
Brazed Joints ◽  
Tin Content ◽  
Steel Joints ◽  
Filler Metals ◽  
Maximum Shear Strength

Vacuum brazing of Cemented Tungsten Carbide (WC-Co) and JIS SCM440 steel using Cu-Sn braze alloy has been studied. The effect of Sn content in the filler metals on the properties of brazed joints was investigated. The specimens were brazed under 1050°C to 1110°C for 5 to 15 minutes. The experimental results show that the maximum shear strength is 341±15MPa for the joints brazed at 1080°C for 10 min by using Cu-9Sn filler. Shear strength of the joints brazed at 1050°C and 1080°C increased as Sn content added to the braze alloy. However, joints brazed at 1110°C showed a decline in shear strength as the increase of Sn content. From SEM micrographs, a Fe-Co-Cu alloy layer was formed at WC-Co/Cu-Sn interface and the property of the layer was affected by brazing temperature and Sn content.

scholarly journals Effect of Temperature and Hold Time of Induction Brazing on Microstructure and Shear Strength of Martensitic Stainless Steel Joints

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1586 ◽  
Author(s):  
Yunxia Chen ◽  
Haichao Cui
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Power Plants ◽  
Filler Metal ◽  
Martensitic Stainless Steel ◽  
Braze Alloy ◽  
Hold Time ◽  
Turbine Blades ◽  
Element Distribution ◽  
Effect Of Temperature

1Cr12Mo martensitic stainless steel is widely used for intermediate and low-pressure steam turbine blades in fossil-fuel power plants. A nickel-based filler metal (SFA-5.8 BNi-2) was used to braze 1Cr12Mo in an Ar atmosphere. The influence of brazing temperature and hold time on the joints was studied. Microstructure of the joints brazed, element distribution and shear stress were evaluated at different brazing temperatures, ranging from 1050 °C to 1120 °C, with holding times of 10 s, 30 s, 50 s and 90 s. The results show that brazing joints mainly consist of the matrix of the braze alloy, the precipitation, and the diffusion affected zone. The filler metal elements diffusion is more active with increased brazing temperature and prolonged hold time. The shear strength of the brazed joints is greater than 250 MPa when the brazing temperature is 1080 °C and the hold time is 30 s.

scholarly journals Brazed Joint Strength of Stainless Steel with Nickel Base Filler Metals

1979 ◽  
Vol 43 (11) ◽  
pp. 1001-1007 ◽  
Author(s):  
Ichiro Kawakatsu ◽  
Tadashi Osawa ◽  
Haruhisa Saito
Keyword(s):  
Stainless Steel ◽  
Joint Strength ◽  
Brazed Joint ◽  
Nickel Base ◽  
Filler Metals

scholarly journals Electron Beam Brazing of Austenitic Stainless Steel AISI 304

2021 ◽  
Author(s):  
Krzysztof Kwieciński ◽  
Piotr Śliwiński
Keyword(s):  
Stainless Steel ◽  
Electron Beam ◽  
Structural Changes ◽  
High Efficiency ◽  
Aisi 304 ◽  
Brazed Joints ◽  
Steel Aisi ◽  
Wetting Process ◽  
Filler Metals ◽  
Stainless Steel Aisi

Electron beam brazing is a joining technology combining the advantages of a precisely controlled heat source and those of vacuum brazing process. The oxide layer decomposes in high-temperature vacuum conditions, which improves the wetting process and, consequently, leads to the obtainment of more favourable properties of the brazed joint. In comparison with brazing in vacuum furnaces, the electron beam brazing process enables the precise heating of selected areas without the necessity of heating the entire element, which, in turn, results in smaller structural changes in the brazed material and the lower consumption of energy. During tests discussed in this article, sheets made of stainless steel AISI 304 were brazed using various copper and silver filler metals. Brazed joints were subjected to microstructural tests and shear strength tests. The results revealed the high efficiency of the electron beam brazing of corrosion-resistant steel sheets using filler metals.

Shielding gas brazing of martensitic stainless steel with copper free silver based filler metals

2007 ◽  
Vol 12 (8) ◽  
pp. 708-717 ◽  
Author(s):  
C. Leinenbach ◽  
N. Gelder ◽  
V. Bissig ◽  
F. Gattiker ◽  
U.E. Klotz
Keyword(s):  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Shielding Gas ◽  
Filler Metals

scholarly journals Laser Surface Structuring of Cemented Carbide for improving the Strength of Induction Brazed Joints

2019 ◽  
Vol 3 (2) ◽  
pp. 44 ◽  
Author(s):  
Ammar Ahsan ◽  
Igor Kryukov ◽  
Stefan Böhm
Keyword(s):  
Joint Strength ◽  
Total Surface Area ◽  
Cemented Carbide ◽  
Surface Pattern ◽  
Micro Patterning ◽  
Brazed Joints ◽  
Diode Pumped ◽  
Surface Patterns ◽  
Steel Joints ◽  
Surface Increase

The effect of micro patterning of cemented carbide surface using nanosecond diode pumped solid-state pulsed laser on the strength of induction brazed carbide and steel joints has been investigated. Surface patterns increase the total surface area of the joint and, for an originally hydrophilic surface, increase the wettability of a liquid on a solid surface such that, instead of building droplets, the liquid spreads and flows on the surface. Microcomputed tomography (µ-CT) was used to observe the filler/carbide interface after brazing and to analyze the presence of porosity or remnant flux in the joint. Microstructures of the brazed joints with various surface patterns were analyzed using scanning electron microscopy. The strength of the joints was measured using shear tests. Results have shown that the groove pattern on the surface of carbide increases the joint strength by 70–80%, whereas, surface patterns of bi-directional grooves (grid) reduced the joint strength drastically. Dimples on the carbide surface did not show any improvement in the strength of the brazed joints compared to samples with no surface pattern.

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