scholarly journals Bimodal Microstructure Obtained by Rapid Solidification to Improve the Mechanical and Corrosion Properties of Aluminum Alloys at Elevated Temperature

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 230
Author(s):  
Irena Paulin ◽  
Črtomir Donik ◽  
Peter Cvahte ◽  
Matjaž Godec
Keyword(s):  
Elevated Temperature ◽  
Aluminum Alloys ◽  
Melt Spinning ◽  
High Strength ◽  
Tensile Tests ◽  
Chemical Compositions ◽  
Corrosion Properties ◽  
Transmission Microscopy ◽  
Aa5083 Alloy ◽  
Mechanical And Corrosion Properties

The demand for aluminum alloys is increasing, as are the demands for higher strength, with the aim of using lighter products for a greener environment. To achieve high-strength, corrosion-resistant aluminum alloys, the melt is rapidly solidified using the melt-spinning technique to form ribbons, which are then plastically consolidated by extrusion at elevated temperature. Different chemical compositions, based on adding the transition-metal elements Mn and Fe, were employed to remain within the limits of the standard chemical composition of the AA5083 alloy. The samples were systematically studied using light microscopy, scanning electron, and transmission microscopy with electron diffraction spectrometry for the micro-chemical analyses. Tensile tests and Vickers microhardness were applied for mechanical analyses, and corrosion tests were performed in a comparison with the standard alloy. The tensile strength was improved by 65%, the yield strength by 45% and elongation by 14%. The mechanism by which we achieved the better mechanical and corrosion properties is explained.

scholarly journals Mechanical behavior and corrosion properties of some AA6xxx aluminum alloys in T5 temper

2006 ◽  
Vol 12 (4) ◽  
pp. 231-235
Author(s):  
Kemal Delijic ◽  
Vanja Asanovic ◽  
Dragan Radonjic
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloys ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Continuous Cast ◽  
Corrosion Properties ◽  
Aqueous Sodium Chloride Solution ◽  
Aqueous Sodium ◽  
The Press ◽  
Mechanical And Corrosion Properties

The paper describes the mechanical and corrosion properties of three heat treatable extruded Al-Mg-Si aluminum alloys. The alloys were tested as T5 tempered (air-quenched directly on the press and artificially aged) after processing by the extrusion of semi-continuous cast and homogenized billets. The addition of small amounts of zirconium and manganese in the base AIMgSiO.7 alloy increased the strength, reaching 310 MPa of tensile strength and increased the corrosion rate by 15% in aqueous sodium chloride solution.

Mechanical and Corrosion Behavior of Friction Stir Welded AA 6063 Alloy

2022 ◽  
pp. 206-214
Author(s):  
Radha R. ◽  
Sreekanth D. ◽  
Tushar Bohra ◽  
Surya Bhan Pratap Singh
Keyword(s):  
Friction Stir Welding ◽  
High Strength ◽  
Metallic Alloys ◽  
Fusion Welding ◽  
Corrosion Properties ◽  
Microstructural Refinement ◽  
Significant Development ◽  
Friction Stir ◽  
Mechanical And Corrosion Properties ◽  
Fsw Parameters

Friction stir welding (FSW) is considered to be the most significant development in solid state metal joining processes. This joining technique is energy efficient, environmentally friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. The project aims to join Aluminum 6063 alloy plates by FSW and emphasize the (1) mechanisms responsible for the formation of welds without any defects, microstructural refinement, and (2) effects of FSW parameters on resultant microstructure, mechanical, and corrosion properties.

scholarly journals Mechanical and corrosion properties of 6061 aluminum alloys recycled by hot-extrusion of cutting chips

2003 ◽  
Vol 53 (11) ◽  
pp. 554-560 ◽  
Author(s):  
Kazutaka SUZUKI ◽  
Ichinori SHIGEMATSU ◽  
Yuan-bin XU ◽  
Tsunemichi IMAI ◽  
Naobumi SAITO
Keyword(s):  
Aluminum Alloys ◽  
Hot Extrusion ◽  
Corrosion Properties ◽  
Mechanical And Corrosion Properties

scholarly journals Causes of Structural Heterogeneity in High-Strength OCTG Tubes and Minimizing Their Impact on Sulfide Stress Corrosion Cracking Resistance

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1843
Author(s):  
Artem Davydov ◽  
Andrey Zhitenev ◽  
Alexey Alhimenko ◽  
Natalya Devyaterikova ◽  
Konstantin Laev
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Structural Heterogeneity ◽  
Corrosion Cracking ◽  
Corrosion Properties ◽  
Sulfide Stress ◽  
Mechanical And Corrosion Properties ◽  
Quenching And Tempering ◽  
Sulfide Stress Corrosion Cracking

High-strength oil country tubular goods (OCTG) like C110, according to standard API 5CT (yield strength at least 758 MPa), are subject to requirements in terms of mechanical and corrosion properties. In this work, we studied the microstructure of seamless casing tubes made of class C110 high-strength steel with a 194.5 mm diameter and 19.7 mm wall thickness, and its influence on sulfide stress corrosion cracking (SSC). Casing tubes were obtained from continuous billets by screw piercing with preliminary quenching and tempering. It was shown that cracking during the tests always begins from the inner surface of the tube. Rough segregation bands were found on the inner tube surface, which occupies about a third of the thickness of the wall. To increase the resistance of 0.3C-Cr-Mn-Mo + 0.15(V + Nb + Ti) steel to SSC, primary recommendations for adjusting the chemical composition, production technology and heat treatment were developed.

scholarly journals Mechanical and Corrosion Properties of High Strength 18% Cr Austenitic Stainless Steel Weldment for Boiler.

1995 ◽  
Vol 35 (10) ◽  
pp. 1258-1264 ◽  
Author(s):  
Kazuhiro Ogawa ◽  
Yoshiatsu Sawaragi ◽  
Nobuo Otsuka ◽  
Hiroyuki Hirata ◽  
Atsushi Natori ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
High Strength ◽  
Corrosion Properties ◽  
Steel Weldment ◽  
Mechanical And Corrosion Properties ◽  
Stainless Steel Weldment

Technological features of autoclave molding of parts of complex configuration from В95оч alloy sheets

2021 ◽  
Author(s):  
Keyword(s):  
Heat Treatment ◽  
Technological Process ◽  
Aging Process ◽  
Sheet Material ◽  
High Strength ◽  
Spring Back ◽  
Corrosion Properties ◽  
Strength Alloy ◽  
Mechanical And Corrosion Properties ◽  
Wing Skin

The development is shown with the use of modeling the technological process of autoclave molding, combined with the aging process, for the manufacture of upper wing skins from sheets of "В95оч" high-strength alloy taking into account the spring back of the workpiece. The results of studies of indicators of mechanical and corrosion properties of the resulting product are presented. Keywords: autoclave molding, heat treatment, springback, upper wing skin, sheet material, "В95оч". [email protected]

Experimental Factors Concerning X-Ray Residual Stress Measurements in High-Strength Aluminum Alloys

1966 ◽  
Vol 10 ◽  
pp. 284-294
Author(s):  
Michael E. Hilley ◽  
James J. Wert ◽  
Robert S. Goodrich
Keyword(s):  
Aluminum Alloys ◽  
Cold Working ◽  
High Strength ◽  
Tensile Tests ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Nondestructive Technique ◽  
Angular Rotation ◽  
X Ray ◽  
High Strength Aluminum Alloys

AbstractX-ray diffraction as a means of determining stresses has found increasing application in the last few years. This is primarily because it is the only technique by which stresses can be determined without making measurements on the specimen or structure in the unstressed condition and, consequently, it is the only truly nondestructive technique for determining residual stresses. The principles of determining macrostresses on surfaces with commercially available equipment is quite well known and employs either the X-ray diffractometer or back-reflect ion camera techniques. The diffractometer technique was selected for this investigation because of its accuracy and because it allows both macrostresses and microstra in to be analyzed from the change in position and shape of the diffraction peaks. The X-ray analysis actually consisted of two separate phases. The first dealt with the X-ray determination of the elastic constants (Young's modulus and Poisson 's ratio) for several aluminum alloys, including 5083. These values were compared with the theoretical or published values as determined by standard tensile tests and used later in stress calculations. For these tests, a unique stress stage was used which allowed the specimen to be stressed while positioned in the diffractometer, and also have angular rotation about the diffractometer axis that is independent of the rotation of the counter and receiving slit system. The second phase consisted of analyzing different groups of 5083—aluminum alloy specimens which had been subjected to various degrees of cold working by rolling. This analysis consisted not only of the computation of macrostresses, but also of microstrain and change in particle size as a function of percentage reduction in thickness. The final portion of this phase dealt with electro polishing successive layers from the surface of each sample and relating the measured relaxation to the thickness of the layers removed. In this way, stress distribution in depth was obtainable as a function of cold working.

Laser Welded Joints of High-Nitrogen Austenitic Steels: Microstructure and Properties

2018 ◽  
Vol 284 ◽  
pp. 344-350 ◽  
Author(s):  
Vera V. Berezovskaya ◽  
A.V. Berezovskiy ◽  
D.H. Hilfi
Keyword(s):  
Welded Joints ◽  
Carbon Dioxide Laser ◽  
Continuous Wave ◽  
High Strength ◽  
Tensile Tests ◽  
Wave Mode ◽  
Austenitic Steels ◽  
Maximum Output ◽  
High Nitrogen ◽  
Corrosion Properties

High nitrogen austenitic steels are used as structural materials required possessing high strength and fracture toughness. The present study is concerned with the characteristic features (shape, size, properties and structure) of the laser welded joints in Cr-Mn-, Cr-Mn-Mo-high nitrogen steels compared to the ones of Cr-Ni-steel joint. Butt welded joints were made using carbon dioxide laser with a maximum output of 5 kW in the continuous wave mode. The hardness and tensile tests of welded joints in the air and 3.5 vol.%-solution of NaCl, as well as the theoretical studies were carried out by optical and transmission electron microscopy (TEM). The results are achieved by testing that the welded joints of HNS had satisfactory weldability, adequately high mechanical and corrosion properties. The austenite of the investigated HNS retains high stability throughout the welding cycle.

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