scholarly journals Avials, history of creation and overview of future outlook

2021 ◽  
Vol 98 (2) ◽  
pp. 23-37
Author(s):  
A.V. Sinchuk ◽  
Keyword(s):  
Corrosion Resistance ◽  
Transition Metals ◽  
Intergranular Corrosion ◽  
Negative Impact ◽  
Recrystallization Temperature ◽  
Corrosion Properties ◽  
Alloying System ◽  
Quench Sensitivity ◽  
Multi Stage ◽  
History Of

Scientific domestic and foreign literature touching the field of Al – Mg – Si wrought aluminum alloys are reviewed, the history of appearance of the most common brands is described. It is shown that the development of alloys was proceed gradually advancing their chemical composition along the quasi-binary Mg/Si = 1.73 сross -section in the direction of increasing concentration of just Mg and Si, and the strength of last modern brands was provided by additional alloying, primarily copper, the content of which can reach 1-1.4%. The influence of alloying elements on microstructure, mechanical and corrosion properties of alloys is described, features of their heat treatment, factors of maximum strengthening and susceptibility to intergranular corrosion are revealed. Attention is focused on the key role of the Mg/Si ratio, transition metals, Cu, Cr and Mn first of all, in the formation of balanced properties, since the positive effect of these elements on increasing the strength and the recrystallization temperature is often offset by the negative impact on intergranular corrosion and quench sensitivity. It is shown that in low-alloyed Al–Mg–Si alloys the strength premises Mg/Si≈1 and the premises for high-end corrosion resistance Mg/Si≈2 are occurred simultaneously. Alongside an increase of the absolute content of Mg and Si in alloys, alongside an increase of alloying degree with other strengthening elements, it is impossible to simultaneously fulfill both of these premises; therefore, one has to look for a reasonable compromise between strengthening, decreasing the technological plasticity and corrosion resistance of alloys. One of the effective ways to reach such a compromise is multi-stage regimes of artificial aging. The prospects of microalloying with Sc and Ca able to form with aluminum nanoscale intermetallic phases of hardening are outlined. Keywords: avials, semi - finished products, alloying system, transition metals, aging, mechanical properties, intergranular corrosion.

scholarly journals Effects of Mn, Zn Additions and Cooling Rate on Mechanical and Corrosion Properties of Al-4.6Mg Casting Alloys

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1983
Author(s):  
Chih-Ting Wu ◽  
Sheng-Long Lee ◽  
Ye-Feng Chen ◽  
Hui-Yun Bor ◽  
Kung-Hui Liu
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Intergranular Corrosion ◽  
Continuous Distribution ◽  
Water Cooling ◽  
Dispersion Strengthening ◽  
Corrosion Properties ◽  
Casting Alloys ◽  
Mechanical And Corrosion Properties ◽  
Al Mg Alloys

The mechanical properties of the Al-Mg alloy can be enhanced by adding metallic elements, but a continuous distribution of precipitates at grain boundaries leads to intergranular corrosion during sensitization treatment. In the present work, Mn, Zn additions, water cooling and furnace cooling were executed to investigate their effects on the mechanical and corrosion properties of the Al-4.6Mg alloy. Our results show that adding Mn to Al-4.6Mg alloys may produce grain refinement and dispersion strengthening, increasing tensile strength and hardness. The presence of Mn did not affect the corrosion resistance of Al-Mg alloys. Adding Zn to the Al-4.6Mg alloy increased tensile strength and hardness, but decreased corrosion resistance. Combined, the addition of Mn and Zn to the Al-4.6Mg alloy exhibited the highest tensile strength and hardness, but seriously reduced corrosion resistance. Furnace cooling substituted for water quenching could avoid intergranular corrosion, but slightly decreased the tensile strength and hardness by 7.0% and 6.8%, respectively.

scholarly journals Effect of Aging Treatment on Intergranular Corrosion Properties of Ultra-Low Iron 625 Alloy

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Zhi-yuan Zhu ◽  
Yi Sui ◽  
An-lun Dai ◽  
Yuan-fei Cai ◽  
Ling-Li Xu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Intergranular Corrosion ◽  
Volume Fraction ◽  
Mass Loss Rate ◽  
Iron Alloy ◽  
Aging Treatment ◽  
Avrami Equation ◽  
Corrosion Properties ◽  
Alloy 625 ◽  
Precipitated Phase

The microstructures evolution of precipitations for an ultra-low iron Alloy 625 subjected to long term aging treatment at 750°C was investigated using scanning electron microscope (SEM) and X-ray diffraction (XRD). The intergranular corrosion behaviors of Alloy 625 were evaluated by using ASTM G28A. The result shows that the precipitated phase γ′′-Ni3Nb was mainly precipitated at the grain boundaries and twin boundaries. The number and volume fraction of γ′′ increased with the prolonging of aging time. The transformation of γ′′ to δ-Ni3Nb occurred after aging periods of 200 h. The corrosion resistance of Alloy 625 was significantly reduced during aging treatment. The decrease in intergranular corrosion resistance of Alloy 625 was attributed to the dissolution of precipitated phase and chromium depleted zone. The mass loss rate of Alloy 625 after aging treatment is related to the volume of precipitated phase and can be simulated by Johnson-Mehl-Avrami equation.

Effect of Scandium Addition on Mechanical Properties and Corrosion Resistance of Medium Strength Al-Zn-Mg-Cu) Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 241-246 ◽  
Author(s):  
Dmitry K. Ryabov ◽  
Nikolay I. Kolobnev ◽  
Sergei V. Samohvalov
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Earth Metal ◽  
Corrosion Properties ◽  
Quench Sensitivity ◽  
Wide Range ◽  
Medium Strength ◽  
Stress Corrosion Resistance ◽  
Structure Improvement ◽  
Mechanical Properties And Corrosion

Al-Zn-Mg alloys are widely used construct material for wide range of application including automotive industry, building, and aviation. Scandium is rare earth metal, which modifies structure of semi-products and can lead to increasing of tensile and yield strength because of Al3Sc intermetallics of nanoscale size. This paper describes results of influence of small addition of scandium (0,08 wt. %) on mechanical and corrosion properties of cold-rolled sheets of 1913 alloy. 1913 is Russian medium strength corrosion resistant weldable Al-Zn-Mg alloy with addition of Cu for improvement of stress corrosion resistance and Mn with Zr for structure improvement. It is shown that addition of Sc transforms kinetics of artificial aging and accelerates decomposition of solid solution, besides tensile strength increases up to 50 MPa in artificially aged tempers. Changes in microstructure and quench sensitivity are described; results of intergranural corrosion, exfoliation and stress corrosion tests are introduced after different heat treatment including peak strength aging and overaging tempers.

Effect of Sensitization Treatment on Corrosion Properties in Austenitic Stainless Steel 304

2016 ◽  
Vol 857 ◽  
pp. 232-236 ◽  
Author(s):  
Chung Seok Kim ◽  
Seung Jae Moon ◽  
Won Sik Kong
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Intergranular Corrosion ◽  
Solution Treatment ◽  
Corrosion Properties ◽  
Before And After ◽  
Degree Of Sensitization ◽  
Electrochemical Potentiokinetic Reactivation ◽  
Materials Failure ◽  
Austenitic Stainless Steel 304

Chromium depletion in AISI304 stainless steel can lead to intergranular corrosion due to temperature conditions and degree of deformation, and consequently to materials failure. The aim of this work is to study the effect of sensitization treatment on the corrosion resistance in AISI304 stainless steel after solution heat treatment at 1,000°C. Sensitization treatments were carried out at 670°C for 1 h, 2h, 5h and 10h in the electrical furnace. The intergranular corrosion resistance of the sensitized specimens was evaluated by double loop electrochemical potentiokinetic reactivation test. The microstructure of the specimens before and after the corrosion tests was observed through optical and scanning electron microscope. Solution treatment shows the dual structure, however, aging for 5 hours depicts the ditch structure. The ratio of current density increased as a function of aging time resulted in increase in the degree of sensitization.

Examining the entry of Walmart into South Africa: A stakeholder management perspective

2019 ◽  
Vol 38 (2) ◽  
pp. 78-89
Author(s):  
Tembinkosi Bonakele ◽  
Dave Beaty ◽  
Fathima Rasool ◽  
Drikus Kriek
Keyword(s):  
South Africa ◽  
Trade Unions ◽  
Negative Impact ◽  
Stakeholder Management ◽  
Sources Of Information ◽  
Key Stakeholders ◽  
Management Perspective ◽  
Labour Standards ◽  
History Of ◽  
Primary Focus

The recent entry of the US multinational Walmart into South Africa has proved to be a source of controversy. Key stakeholders in South Africa objected to the merger and attempted to block it unless certain conditions were met. The aim of this study was to examine the controversy and the conditions surrounding the merger. The research employed a qualitative archival analysis to examine publicly available sources of information with regard to the merger. The findings revealed key stakeholders’ concerns that Walmart’s entry would lead to an increase in imports which would displace local producers, increase unemployment, marginalise trade unions and lower labour standards unless certain conditions were met. The results also revealed problems relating to the firm’s primary focus on “business” while neglecting “public interest” issues, naively relying on their “local retailer” to manage key stakeholders, and assuming that their perceived controversial reputation regarding treatment of trade unions and their views about unemployment as well as the controversies surrounding their history of entry into other global markets would not have the major negative impact it did on stakeholders in South Africa.

FANSTEEL 42

Alloy Digest ◽  
1965 ◽  
Vol 14 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Base Alloy ◽  
Stress Rupture ◽  
Heat Treating ◽  
Recrystallization Temperature ◽  
Stress Rupture Properties ◽  
Rupture Properties

Abstract FANSTEEL 42 Metal is a molybdenum-base alloy recommended for high temperature applications. It has high recrystallization temperature and good stress-rupture properties. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: Mo-6. Producer or source: Fansteel Metallurgical Corporation.

NIROSTA 4465

Alloy Digest ◽  
2000 ◽  
Vol 49 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Intergranular Corrosion ◽  
Phosphate Rock ◽  
Heat Treating ◽  
Chromium Alloy ◽  
Low Carbon ◽  
High Chromium ◽  
Temperature Performance

Abstract Nirosta 4465 is a low-carbon, high-chromium alloy with nickel and molybdenum. It has good corrosion and intergranular corrosion resistance. The alloy is used for processing phosphate rock. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-797. Producer or source: ThyssenKrupp Nirosta.

NIROSTA 4429

Alloy Digest ◽  
2000 ◽  
Vol 49 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Pitting Corrosion ◽  
Intergranular Corrosion ◽  
Heat Treating ◽  
Low Carbon ◽  
High Nitrogen ◽  
Temperature Performance ◽  
Pitting Corrosion Resistance

Abstract Nirosta 4429 is a low-carbon, high-nitrogen version of type 316 stainless steel. The low carbon imparts intergranular corrosion resistance while the nitrogen imparts both higher strength and some increased pitting corrosion resistance. It is recommended for use as welded parts that need not or cannot be annealed after welding. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-787. Producer or source: ThyssenKrupp Nirosta.

SANDVIK 5R75

Alloy Digest ◽  
2000 ◽  
Vol 49 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Austenitic Stainless Steel ◽  
Physical Properties ◽  
Intergranular Corrosion ◽  
Heat Treating ◽  
Steel Company ◽  
Temperature Performance

Abstract Sandvik 5R75 is a molybdenum-containing austenitic stainless steel with titanium added to prevent intergranular corrosion by tying up the carbon. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-777. Producer or source: Sandvik Steel Company. Originally published March 2000, corrected November 2000.

URANUS S1

Alloy Digest ◽  
1999 ◽  
Vol 48 (7) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Nitric Acid ◽  
Physical Properties ◽  
Tensile Properties ◽  
Intergranular Corrosion ◽  
Heat Treating ◽  
Temperature Performance ◽  
High Silicon

Abstract URANUS S1 is the development of 15 years research into alloys containing high silicon contents (4% here) to resist the transpassive intergranular corrosion from such chemicals as concentrated nitric acid. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-751. Producer or source: Cruesot-Marrel.

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