scholarly journals The Influence of Cryogenic Conditions on the Process of AA2519 Aluminum Alloy Cracking

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1555
Author(s):  
M. Kotyk ◽  
D. Boroński ◽  
P. Maćkowiak
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Low Temperature ◽  
Cryogenic Temperature ◽  
American Military ◽  
Heat Treated ◽  
Curve Method ◽  
Liquid Nitrogen Bath ◽  
Cryogenic Conditions ◽  
Two Temperature

This study presents the results of tests involving determining quantities used to describe fracture toughness of a heat-treated AA2519 aluminum alloy applied in, among other things, constructing American military amphibians. These quantities were determined using the J–R curve method for two temperature values, 293 K and 77 K. The low temperature was provided by putting the tested specimen into a liquid nitrogen bath and keeping it there throughout the experiment. Based on the tests results, cryogenic conditions cause an increase in the maximum experimental value of the J–JQ integral, from 66.3 to 87.3 kJ/m2 Moreover, an analysis of the fatigue fracture microstructure revealed differences between specimens tested in ambient temperature and those tested in cryogenic temperature.

Variations in Fracture Toughness for Alloy 718 Given a Modified Heat Treatment

1990 ◽  
Vol 112 (1) ◽  
pp. 116-123 ◽  
Author(s):  
W. J. Mills ◽  
L. D. Blackburn
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Fracture Mechanisms ◽  
Alloy 718 ◽  
Percent Confidence Level ◽  
Heat Treated ◽  
Curve Method ◽  
Heat Treated Condition ◽  
The Impact ◽  
Product Forms

Heat-to-heat and product-form variations in the JIC fracture toughness for Alloy 718 were characterized at 24, 427, and 538°C using the multiple-specimen JR-curve method. Six different material heats along with three product forms from one of the heats were tested in the modified heat treated condition. This heat treatment was developed at Idaho National Engineering Laboratory to improve the impact toughness for Alloy 718 weldments, but it has also been found to enhance the fracture resistance for the base metal. Statistical analysis of test results revealed four distinguishable JIC levels with mean toughness levels ranging from 87 to 190 kJ/m2 at 24°C. At 538°C, JIC values were 15 to 20 percent lower than room temperature toughness levels. Minimum expected values of JIC (ranging from 72 kJ/m2 at 24°C to 48 kJ/m2 at 538°C) and dJR/da (27 MPa at 24 to 538°C) were established based on tolerance intervals bracketing 90 percent of the lowest JIC and dJR/da populations at a 95 percent confidence level. Metallographic and fractographic examinations were performed to relate key microstructural features and operative fracture mechanisms to macroscopic properties.

Effect of Cryogenic Temperature on the Fracture Toughness of Graphite/Epoxy Composites

2005 ◽  
Vol 128 (2) ◽  
pp. 151-157 ◽  
Author(s):  
S. G. Kalarikkal ◽  
B. V. Sankar ◽  
P. G. Ifju
Keyword(s):  
Fracture Toughness ◽  
Composite Laminates ◽  
Cryogenic Temperature ◽  
Liquid Nitrogen Temperature ◽  
Woven Composites ◽  
Cryogenic Temperatures ◽  
Textile Composite ◽  
Different Types ◽  
Cryogenic Conditions ◽  
Displacement Diagram

The research presented in this paper is an effort to better understand the interlaminar fracture behavior of graphite/epoxy composite laminates in cryogenic conditions. Double cantilever beam tests were performed on different types of specimens, at room and cryogenic temperatures, and the fracture toughness was calculated from their load-displacement diagram. Additionally, the fracture toughness of some plain-weave textile composite specimens and specimens treated with nanoparticles (38nmAl2O3) were also measured. It was observed that all specimens, with the exception of woven composites, showed deterioration in fracture toughness at the liquid nitrogen temperature. Nanoparticle treated specimens showed an improvement in fracture toughness, both at room and cryogenic temperatures compared to the control specimens. The woven composite specimens showed an increase in fracture toughness at cryogenic temperature. The results indicate that woven fiber composites may have potential in lightweight cryogenic storage systems.

Effect of Temperature and Heat Treatment Status on the Ductile Fracture Toughness of 2219 Aluminum Alloy

2011 ◽  
Vol 689 ◽  
pp. 302-307 ◽  
Author(s):  
Wen Qing Qu ◽  
Min Yuan Song ◽  
Jun Shan Yao ◽  
Hai Yun Zhao
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Low Temperature ◽  
Effect Of Temperature ◽  
Treatment Status ◽  
2219 Aluminum Alloy ◽  
Point Bend ◽  
Temperature Heat Treatment ◽  
Better Than

Through measurement of fracture toughness of 2219 aluminum alloy three-point bend specimen and observation of fracture surface and microstructure at different temperature, the influences of temperature and heat treatment status on the fracture toughness of 2219 aluminum alloy are discussed. The results show that temperature has an important influence on the fracture toughness of 2219 aluminum alloy. Compared with fracture toughness in room temperature, the fracture toughness is increased by 36% at low temperature. Heat treatment status also affects fracture toughness greatly, and fracture toughness in the T62 state is better than that in the T87 state. In conclusion, the reason why enhancement of fracture toughness of 2219 aluminum alloy at low temperature appearance is concluded.

REPUBLIC HP 9-4-45

Alloy Digest ◽  
1965 ◽  
Vol 14 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Yield Strength ◽  
Heat Treating ◽  
Isothermal Heat Treatment ◽  
Temperature Performance ◽  
Heat Treated ◽  
Thin Walled

Abstract Republic HP 9-4-45 is a heat treated alloy steel capable of developing a yield strength of 250,000 psi with superior toughness characteristics. It is designed for sheet and thin-walled forged sections. It is also designed for heavy forging where an isothermal heat treatment is employed. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-179. Producer or source: Republic Steel Corporation, Titanium Division.

REPUBLIC HP 9-4-25

Alloy Digest ◽  
1965 ◽  
Vol 14 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Treated Condition ◽  
Heat Treated ◽  
Heat Treated Condition ◽  
Better Than

Abstract Republic HP 9-4-25 is a heat treated alloy steel capable of developing yield strengths up to 200,000 psi with toughness characteristics better than other quench and tempered alloys. It is designed for sheet, plate and forging applications. It is also designed to be welded in the heat treated condition. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-181. Producer or source: Republic Steel Corporation.

AISI 4640

Alloy Digest ◽  
1958 ◽  
Vol 7 (4) ◽  
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Heat Treating ◽  
Steel Mills ◽  
Temperature Performance ◽  
Heat Treated ◽  
Shock Resistance ◽  
Good Heat

Abstract AISI 4640 is an oil hardening nickel-molybdenum alloy steel having good heat treated properties, toughness and shock resistance. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-67. Producer or source: Alloy steel mills and foundries.

7499-T7651

Alloy Digest ◽  
2006 ◽  
Vol 55 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Tensile Properties ◽  
High Strength ◽  
Aircraft Structures ◽  
Heat Treated ◽  
Wing Skin

Abstract Aluminum alloy 7449 in the T7651 temper is solution heat treated, stress relieved, and overaged. This processing produces an alloy of high strength, good corrosion/exfoliation resistance, and good toughness. An application of interest is the upper-wing skin of aircraft structures. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming. Filing Code: AL-402. Producer or source: Pechiney Rolled Products LLC.

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