scholarly journals Effect of weld metal composition on impact toughness properties of shielded metal arc welded ultra-high hard armor steel joints

2020 ◽  
Vol 29 (1) ◽  
pp. 186-194
Author(s):  
V. Balaguru ◽  
Visvalingam Balasubramanian ◽  
P. Sivakumar
Keyword(s):  
Impact Toughness ◽  
Weld Metal ◽  
Welded Joints ◽  
Weight Ratio ◽  
High Hardness ◽  
High Strength ◽  
Solidification Mode ◽  
Austenitic Phase ◽  
Ferrite Number ◽  
Steel Joints

AbstractNowadays, ultra-high hard armor (UHA) steels are employed in armor tracked vehicle (ATV) construction because of their high hardness, high strength to weight ratio, and excellent toughness. UHA steels are usually welded using austenitic stainless steel (ASS) welding consumables, to avoid hydrogen-induced cracking (HIC). The use of ASS consumables to weld the above steel was the only available remedy because of higher solubility of hydrogen in the austenitic phase. In this investigation, an attempt was made to investigate the effect of ASS consumables (with different Creq/Nieq ratio) on solidification mode, impact toughness and microstructural characteristics of shielded metal arc (SMA) welded UHA steel joints. The welded joints were characterised based on impact toughness properties, hardness, and microstructural features. As the ferrite number increases with an increase in Creq/Nieq ratio result in different solidification mode (A, FA, F). It is also found that ferrite number of weld metal has appreciable influence on impact toughness and has inversely proportional relationship with impact toughness of the welded joints.

Influence of different filler weld wire chemistries on metallurgical and mechanical behavior of ultrahigh strength steel welded joints

2019 ◽  
Vol 233 (11) ◽  
pp. 2280-2300 ◽  
Author(s):  
Varun Sharma ◽  
AS Shahi ◽  
Subodh Kumar
Keyword(s):  
Tensile Strength ◽  
Impact Toughness ◽  
Weld Metal ◽  
Welded Joints ◽  
High Hardness ◽  
Ultrahigh Strength ◽  
Ultrahigh Strength Steel ◽  
Shear Lip ◽  
Shear Area ◽  
Welding Processes

Three different filler combinations comprising of ferritic, austenitic, and (ferritic + austenitic) were used to fabricate butt welded joints on 15 mm thick ultrahigh strength steel using hybrid arc welding processes. Owing to different weld metal compositions, a significant variation in metallurgical properties of these welds was observed, which consequently affected their mechanical properties in terms of tensile and impact toughness. Acicular ferrite with relatively soft zones formed in the ferritic weld metal imparted better impact toughness and ductility, whereas the joints welded using austenitic filler wire due to formation of hard martensitic structure showed high hardness across all their zones which resulted into higher tensile strength but poor ductility and impact toughness. SEM fractographs facilitated studying of shear lip formation and percentage shear area, and could be correlated with the ductility and impact toughness of the welded joints to a reasonable extent. Among all the welds, ferritic filler showed relatively less joint efficiency as well as ultimate tensile strength, but could be considered as a better choice over the austenitic as well their combination (ferritic + austenitic), as it performed better in terms of tensile ductility as well as impact toughness.

Effect of Electrolytes Variation on the Formation of Oxide Layers of Al7075 Alloys by Electrolytic Plasma Processing

2013 ◽  
Vol 378 ◽  
pp. 209-212
Author(s):  
Dong Gun Lee ◽  
Byunh Hyun Ahn ◽  
Je Hyun Lee ◽  
Uk Rae Cho ◽  
Bon Heun Koo
Keyword(s):  
Treatment Process ◽  
Protective Coatings ◽  
Plasma Processing ◽  
Weight Ratio ◽  
High Hardness ◽  
High Strength ◽  
Heavy Duty ◽  
Conventional Steel ◽  
Steel Material ◽  
Electrolytic Plasma Processing

Al7075 alloy has typically good mechanical properties. Al7075 alloy has an ultimate tensile strength and yield strength, which is commonly used in the manufacturing of heavy-duty structures requiring good corrosion resistance and in applications requiring high strength to weight ratio, as well as good fatigue resistance. However, as compared to strength and corrosion of conventional steel material, it has some drawbacks. To overcome these disadvantages, Electrolytic plasma processing (EPP) was used. (EPP) is a novel electrochemical and physical surface treatment process for generating protective coatings on light metals. Because, these coating scan present high hardness and continuous barriers, it can offers good protection against abrasion, corrosion and heat as well as electrical insulation. The EPP treatments were carried out under a hybrid voltage of AC 200V (50Hz) combined with DC 260V power supply.

scholarly journals Peculiarities of alloying of weld metal of high-strength aluminium alloy welded joints with scandium

2014 ◽  
Vol 2014 (5) ◽  
pp. 28-32 ◽  
Author(s):  
V.E. Fedorchuk ◽  
◽  
O.S. Kushnaryova ◽  
T.A. Alekseenko ◽  
Yu.V. Falchenko ◽  
...  
Keyword(s):  
Weld Metal ◽  
Aluminium Alloy ◽  
Welded Joints ◽  
High Strength

Micro Machining of Nonconductive Al2O3 Ceramic on Developed TW-ECSM Setup

2012 ◽  
pp. 167-177
Author(s):  
Alakesh Manna ◽  
Amandeep Kundal
Keyword(s):  
Weight Ratio ◽  
High Hardness ◽  
High Strength ◽  
Ceramic Materials ◽  
Actual Condition ◽  
Test Results ◽  
Machining Performance ◽  
Machining Processes ◽  
Al2o3 Ceramic ◽  
Advanced Ceramic

Advanced ceramic materials are gradually becoming very important for their superior properties such as high hardness, wear resistance, chemical resistance, and high strength to weight ratio. But machining of advanced ceramic like Al2O3-ceramics is very difficult by any well known and common machining processes. Normally, cleavages and triangular fractures generate when machining of these materials is done by traditional machining methods. It is essential to develop an efficient and accurate machining method for processing advanced ceramic materials. For effective machining of Al2O3-ceramics, a traveling wire electrochemical spark machining (TW-ECSM) setup has been developed. The developed TW-ECSM setup has been utilized to machine Al2O3 ceramic materials and subsequently test results are utilized to analyze the machining performance characteristic. Different SEM photographs show the actual condition of the micro machined surfaces. The practical research analysis and test results on the machining of Al2O3 ceramics by developed TWECSM setup will provide a new guideline to the researchers and manufacturing engineers.

Micro Machining of Nonconductive Al2O3 Ceramic on Developed TW-ECSM Setup

2011 ◽  
Vol 1 (2) ◽  
pp. 46-55
Author(s):  
Alakesh Manna ◽  
Amandeep Kundal
Keyword(s):  
Weight Ratio ◽  
High Hardness ◽  
High Strength ◽  
Ceramic Materials ◽  
Actual Condition ◽  
Test Results ◽  
Machining Performance ◽  
Machining Processes ◽  
Al2o3 Ceramic ◽  
Advanced Ceramic

Advanced ceramic materials are gradually becoming very important for their superior properties such as high hardness, wear resistance, chemical resistance, and high strength to weight ratio. But machining of advanced ceramic like Al2O3-ceramics is very difficult by any well known and common machining processes. Normally, cleavages and triangular fractures generate when machining of these materials is done by traditional machining methods. It is essential to develop an efficient and accurate machining method for processing advanced ceramic materials. For effective machining of Al2O3-ceramics, a traveling wire electrochemical spark machining (TW-ECSM) setup has been developed. The developed TW-ECSM setup has been utilized to machine Al2O3 ceramic materials and subsequently test results are utilized to analyze the machining performance characteristic. Different SEM photographs show the actual condition of the micro machined surfaces. The practical research analysis and test results on the machining of Al2O3 ceramics by developed TWECSM setup will provide a new guideline to the researchers and manufacturing engineers.

scholarly journals Impact Toughness of High-Strength Low-Alloy Steel Welded Joints

2018 ◽  
Vol 3 (3) ◽  
pp. 98-104 ◽  
Author(s):  
Andreja Ilić ◽  
Lozica Ivanović ◽  
Blaža Stojanović ◽  
Danica Josifović ◽  
Eleonora Desnica
Keyword(s):  
Impact Toughness ◽  
Alloy Steel ◽  
Welded Joints ◽  
High Strength ◽  
Low Alloy Steel

scholarly journals Analysis of Selected Properties of Welded Joints of the HSLA Steels

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1301 ◽  
Author(s):  
Ivan Miletić ◽  
Andreja Ilić ◽  
Ružica R. Nikolić ◽  
Robert Ulewicz ◽  
Lozica Ivanović ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Welded Joints ◽  
Welded Joint ◽  
High Strength ◽  
Hardness Distribution ◽  
Micro Hardness ◽  
Hsla Steels ◽  
Applied Technology ◽  
Welding Procedure ◽  
The Impact

This paper presents research of the impact toughness and hardness distribution in specific zones of a ‘single V’butt multiple-pass welded joints of the high-strength low-alloyed steels. Obtained values of the impact toughness are analyzed in correlation with a microstructure in specific zones of the welded joint, together with the micro hardness distribution found in the related zones. Based on the carried out analysis and results obtained in experiments, the applied technology of welding was evaluated. The original conclusions on influence of the selected welding procedure manual metal arc (MMA) for the root passes and metal active gas (MAG) for the filling and covering passes) on impact toughness of the high-strength low-alloyed steels are drawn. The paper also presents discussion on the valid standards and recommendations related to welding of those steels, from the aspect of applications in design of steel welded constructions.

Effect of Hot Work on Hardness and Impact Toughness of Heat Treated Low Alloy Steels

2014 ◽  
Vol 1082 ◽  
pp. 197-201
Author(s):  
Mahmoud M. Tash ◽  
Saleh A. Alkahtani ◽  
Khaled A. Abuhasel
Keyword(s):  
Impact Toughness ◽  
Hot Forging ◽  
Weight Ratio ◽  
High Strength ◽  
Extensive Study ◽  
Low Alloy Steels ◽  
Alloying Additions ◽  
Heat Treated ◽  
Alloy Steels ◽  
Effect Of Hot Rolling

The present study was undertaken to investigate the effect of hot work reduction ratio on the hardness and impact toughness of different grades of low alloy steels. The effect of hot rolling and hot forging with different reduction ratios on the hardness and impact toughness properties will be studied. An extensive study will be carried out to investigate the effect of alloying additions and TMT parameters on the hardness and impact toughness of heat-treated low alloy steels. An understanding of the combined effect of TMT and heat treatment on the hardness and impact toughness of the low alloy steels would help in selecting conditions required to achieve optimum mechanical properties and alloy high strength to weight ratio.

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