scholarly journals Microstructure Observation of Weld Interface between 6063 Al alloy and S45C Carbon Steel by Means of Friction Stirring

2007 ◽  
Vol 25 (3) ◽  
pp. 426-430 ◽  
Author(s):  
Toshiaki YASUI ◽  
Yoichiro SHIMODA ◽  
Takayuki ISHII ◽  
Masami TSUBAKI ◽  
Masahiro FUKUMOTO
Keyword(s):  
Carbon Steel ◽  
Weld Interface ◽  
Al Alloy ◽  
Microstructure Observation ◽  
6063 Al Alloy

Hole Expansion by Using Al-Alloy Specimen and 0.45% Carbon Steel Specimen

2010 ◽  
Vol 452-453 ◽  
pp. 601-604
Author(s):  
Muhammed Sohel Rana ◽  
Md. Shafiul Ferdous ◽  
Chobin Makabe ◽  
Masaki Fujikawa
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Carbon Steel ◽  
Cold Work ◽  
Fatigue Crack Initiation ◽  
Steel Specimen ◽  
Expansion Method ◽  
Al Alloy ◽  
2024 Aluminum Alloy ◽  
Cold Worked

The enhancement method of fatigue life and the crack initiate and growth behavior of a holed specimen was investigated by using the 2024 Aluminum alloy and 0.45% Carbon steel. The purpose of present study is to propose a simple technical method for enhancement of fatigue life in a notched specimen. Also, the effect of local plastic deformation by cold work on fatigue crack initiation behavior was examined. This paper presents a basic experimental kinematic cold expansion method by inserting and removing a pin through the specimen hole. The shape of cross-section of pin was a circle or an ellipse. It was shown that the fatigue life of the specimen with the cold-worked hole was longer than that of the specimen with non-cold-worked hole for the case of same stress level in aluminum alloy and carbon steel. Also, the fatigue strength was higher in the case of the cold expanded hole. In this study, a methodology of lengthening of fatigue life of holed specimen is shown. Also, the improvement conditions of fatigue life were significantly affected by shape of pin, local hardening and residual stress conditions. The fatigue life improvement of the damaged component of structures was studied.

scholarly journals Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2177 ◽  
Author(s):  
Andrey Gnedenkov ◽  
Sergey Sinebryukhov ◽  
Dmitry Mashtalyar ◽  
Igor Vyaliy ◽  
Vladimir Egorkin ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Welded Joint ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Weld Interface ◽  
Open Circuit ◽  
Al Alloy ◽  
Protective Properties ◽  
Coating Formation ◽  
Electrode Technique

The high electrochemical activity of the aircraft 1579 aluminium alloy with a welded joint and the necessity of the coating formation to protect this material against corrosion as well as to increase the stability of the weld interface in the corrosive medium has been previously established. In this work, two suggested methods of protective coating formation based on plasma electrolytic oxidation (PEO) in tartrate-fluoride electrolyte significantly increased the protective properties of the welded joint area of the 1579 Al alloy. The electrochemical properties of the formed surface layers have been investigated using SVET (scanning vibrating electrode technique) and SIET (scanning ion-selective electrode technique), EIS (electrochemical impedance spectroscopy), OCP (open circuit potential), and PDP (potentiodynamic polarization) in 0.5 M NaCl. The less expressed character of the local electrochemical processes on the welded 1579 Al alloy with the composite coating in comparison with the base PEO-layer has been established. Polymer-containing coatings obtained using superdispersed polytetrafluoroethylene (SPTFE) treatment are characterized by the best possible protective properties and prevent the material from corrosion destruction. Single SPTFE treatment enables one to increase PEO-layer protection by 5.5 times. The results of this study indicate that SVET and SIET are promising to characterize and to compare corrosion behaviour of coated and uncoated samples with a welded joint in chloride-containing media.

Application of the friction surfacing process in a CNC machining center: a viability assessment for producing Al-alloy coatings on low carbon steel

2018 ◽  
Vol 40 (1) ◽  
Author(s):  
Márcio Maciel da Silva ◽  
Michel Lenhago Beneducci Afonso ◽  
Stephanny Lohanny Nunes Silva ◽  
Fernanda Christina Teotonio Dias Troysi ◽  
Ítalo Bruno dos Santos ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Cnc Machining ◽  
Al Alloy ◽  
Low Carbon ◽  
Viability Assessment ◽  
Friction Surfacing ◽  
Machining Center ◽  
Cnc Machining Center

Joint Strength and its Improvement of Friction Welded Joint Between Ductile Cast Iron and 5052 Al Alloy

2020 ◽  
Author(s):  
Masaaki Kimura ◽  
Akira Yoneda ◽  
Masahiro Kusaka ◽  
Koichi Kaizu ◽  
Kazuhiro Hayashida ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Base Metal ◽  
Joint Strength ◽  
Welded Joint ◽  
Weld Interface ◽  
Ductile Cast Iron ◽  
Al Alloy ◽  
High Tensile Strength ◽  
Graphite Particles

Abstract To obtain dissimilar joint for easily making multi-material structures, the characteristics of friction welded joint between ductile cast iron (FCD400) and 5052 Al alloy (A5052) was investigated. The relatively high tensile strength of joint was obtained when that was made with a friction speed of 27.5 s−1, a friction pressure of 20 MPa, a friction time of 1.5 s, and a forge pressure of 270 MPa, respectively. However, this joint had approximately 77% in the tensile strength of the A5052 base metal and that was fractured at the weld interface. Although the weld interface had no intermetallic compound layer, the fractured surface at the A5052 side had some graphite particles that were supplied from the FCD400 side. To improve the joint strength, the graphite particles were reduced from the weld faying surface at the FCD400 side by decarburization treatment. The joint had approximately 96% in the tensile strength of the A5052 base metal and that was fractured between the A5052 side and the weld interface. The joint with high tensile strength as well as the possibility improving the fractured point of that were obtained when those were made with opportune friction welding condition and no graphite particles at the weld faying surface of the FCD400 side.

Effect of aging on mechanical properties of 6063 Al-alloy using instrumented ball indentation technique

2010 ◽  
Vol 527 (6) ◽  
pp. 1590-1594 ◽  
Author(s):  
G. Das ◽  
Mousumi Das ◽  
Sabita Ghosh ◽  
Paritosh Dubey ◽  
A.K. Ray
Keyword(s):  
Mechanical Properties ◽  
Al Alloy ◽  
Indentation Technique ◽  
Ball Indentation ◽  
6063 Al Alloy

scholarly journals Development and Optimization of Tin/Flux Mixture for Direct Tinning and Interfacial Bonding in Aluminum/Steel Bimetallic Compound Casting

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5642
Author(s):  
Mohamed Ramadan ◽  
Abdulaziz S. Alghamdi ◽  
K. M. Hafez ◽  
Tayyab Subhani ◽  
K. S. Abdel Halim
Keyword(s):  
Carbon Steel ◽  
Steel Substrate ◽  
Volume Ratio ◽  
Solid Substrate ◽  
Interfacial Bonding ◽  
Al Alloy ◽  
Compound Casting ◽  
Bonding Area ◽  
Bearing Alloy

Interfacial bonding highly affects the quality of bimetallic bearing materials, which primarily depend upon the surface quality of a solid metal substrate in liquid–solid compound casting. In many cases, an intermediate thin metallic layer is deposited on the solid substrate before depositing the liquid metal, which improves the interfacial bonding of the opposing materials. The present work aims to develop and optimize the tinning process of a solid carbon steel substrate after incorporating flux constituents with the tin powder. Five ratios of tin-to-flux—i.e., 1:1, 1:5, 1:10, 1:15, and 1:20—were used for tinning process of carbon steel solid substrate. Furthermore, the effect of volume ratios of liquid Al-based bearing alloy to solid steel substrate were also varied—i.e., 5:1, 6.5:1 and 8.5:1—to optimize the microstructural and mechanical performance, which were evaluated by interfacial microstructural investigation, bonding area determination, hardness and interfacial strength measurements. It was found that a tin-to-flux ratio of 1:10 offered the optimum performance in AlSn12Si4Cu1/steel bimetallic materials, showing a homogenous and continuous interfacial layer structure, while tinned steels using other percentages showed discontinuous and thin layers, as in 1:5 and 1:15, respectively. Furthermore, bimetallic interfacial bonding area and hardness increased by increasing the volume ratio of liquid Al alloy to solid steel substrate. A complete interface bonding area was achieved by using the volume ratio of liquid Al alloy to solid steel substrate of ≥8.5.

Effects of Filler Compositions on Mechanical and Physical Properties of the Dissimilar Resistance Spot Welded between Aluminium Alloy and Carbon Steel

2015 ◽  
Vol 656-657 ◽  
pp. 422-427
Author(s):  
Yustiasih Purwaningrum ◽  
Triyono ◽  
Muhammad Fathan
Keyword(s):  
Carbon Steel ◽  
Weld Metal ◽  
Physical Properties ◽  
Aluminium Alloy ◽  
Base Metal ◽  
Testing Machine ◽  
Optical Microscope ◽  
Filler Materials ◽  
Al Alloy ◽  
Resistance Spot

The resistance spot weld (RSW) of dissimilar materials betweeen steel and aluminium is generally more complex than that of similar materials due to the extreme differences in the mechanical, physical and chemical properties of the base metals. This study proposed the use of filler material to connect the differences of their properties. Al-Alloy 5083 with thickness of 4 mm and 1.2 mm thick carbon steel SS400 were joined in lap joint types using RSW with the filler materials. The filler materials were a mixture of steel and aluminium in which weight composition variations (Fe:Al) were 90:10; 70:30; 30:70 and 90:10 in percent. The physical properties were examined based on the microstructure using optical microscope while the mechanical properties were measured with respect to the strength and hardness using Universal Testing Machine and Vickers Microhardness respectively. Results showed that weld metals with filler composition of 70:30% had highest shear-strength. The microstructure examinations showed that Microstructure of base metal and HAZ carbon steel was ferrite and perlite while that of weld metal was bainite. There were no significant differences in the microstructures and the hardness of weld metal, HAZ, and the base metal of aluminium alloy-5083 due to nonheat-treatable material.

Spot Welding between Aluminum Alloy and Steel by Friction Stirring

2010 ◽  
Vol 638-642 ◽  
pp. 1227-1232 ◽  
Author(s):  
Masahiro Fukumoto ◽  
K. Miyagawa ◽  
M. Tsubaki ◽  
T. Yasui
Keyword(s):  
Mechanical Strength ◽  
Spot Welding ◽  
Steel Plate ◽  
Static Condition ◽  
Weld Interface ◽  
Al Alloy ◽  
Tensile Shear ◽  
Coated Layer ◽  
Fresh Surface ◽  
Observation Results

Spot welding between Al alloy and some kinds of steels by friction stirring was conducted. In the process, a rotating tool was plunged into the Al alloy which was overlapped onto the steel plate, and held at the plunge depth for a few seconds with rotating condition. In this welding, friction stirring was adopted only inside of the Al alloy, and welding between Al alloy and steel is performed by an interaction of stirred Al alloy to the fixed steel surface. Mechanical strength of the joints was evaluated by both tensile shear test and cross tensile test. From the observation results on the microstructure of the weld interface, it was found that Fe/Al intermetallic compound with a few m thickness was formed at the interface. It was found that Zinc coated layer intrinsically has a role to protect the steel materials at a static condition, however, in the stirring condition of Al alloy, Zinc layer easily moved toward the outside of stirring zone and resultant fresh surface of the steel enables formation of the higher mechanical strength of the joint.

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