Effects of cooling rate and γ′ morphology on creep and stress-rupture properties of a powder metallurgy superalloy

1990 ◽  
Vol 21 (6) ◽  
pp. 1709-1717 ◽  
Author(s):  
P. R. Bhowal ◽  
E. F. Wright ◽  
E. L. Raymond
Keyword(s):  
Powder Metallurgy ◽  
Cooling Rate ◽  
Stress Rupture ◽  
Creep And Stress Rupture ◽  
Stress Rupture Properties ◽  
Rupture Properties

AISI No. 664

Alloy Digest ◽  
1981 ◽  
Vol 30 (7) ◽  
Keyword(s):  
High Temperature ◽  
Stress Rupture ◽  
Heat Treating ◽  
Good Combination ◽  
Creep And Stress Rupture ◽  
High Temperature Alloy ◽  
Vacuum Melting ◽  
Stress Rupture Properties ◽  
Nickel Base ◽  
Rupture Properties

Abstract AISI No. 664 is a nickel-base high-temperature alloy that can be precipitation hardened because of its contents of aluminum and titanium. Vacuum melting is used in its production to provide excellent quality and reproducability. It is used for applications requiring a good combination of creep and stress-rupture properties up to about 1500 F. Typical applications are gas-turbine components, airframes and fasteners. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-269. Producer or source: Nickel alloy producers.

scholarly journals THE CREEP AND STRESS-RUPTURE PROPERTIES OF γ′ CRYSTALS

1974 ◽  
Vol 23 (1) ◽  
pp. 69
Author(s):  
CHEN CHI ◽  
DENG ZHI-SHENG ◽  
WU BAI-QUN ◽  
DING SHU-SHENG
Keyword(s):  
Stress Rupture ◽  
Creep And Stress Rupture ◽  
Stress Rupture Properties ◽  
Rupture Properties

UNITEMP 188

Alloy Digest ◽  
1990 ◽  
Vol 39 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Elevated Temperatures ◽  
Stress Rupture ◽  
High Strength ◽  
Heat Treating ◽  
Creep And Stress Rupture ◽  
Stress Rupture Properties ◽  
Specialty Steel ◽  
Rupture Properties ◽  
Oxidation And Corrosion

Abstract UNITEMP 188 provides outstanding oxidation and corrosion resistance, high strength at elevated temperatures, excellent creep and stress-rupture properties and thermal fatigue resistance. This datasheet provides information on composition, physical properties, and elasticity as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-80. Producer or source: Cytemp Specialty Steel Division, Cyclops. Originally published July 1983, revised October 1990.

Influence of Cooling Method on the Microstructure and Stress Rupture Property of a Single Crystal Superalloy

2015 ◽  
Vol 816 ◽  
pp. 513-517 ◽  
Author(s):  
Zhen Xue Shi ◽  
Shi Zhong Liu ◽  
Xiao Guang Wang ◽  
Jia Rong Li
Keyword(s):  
Single Crystal ◽  
Cooling Rate ◽  
Stress Rupture ◽  
Single Crystal Superalloy ◽  
Air Cooling ◽  
Water Cooling ◽  
Stress Rupture Property ◽  
Cooling Method ◽  
Stress Rupture Properties ◽  
Rupture Properties

The single crystal superalloy with [001] orientation were prepared by screw selecting method in the directionally solidified furnace. Three different cooling method, water cooling (WC), air cooling (AC) and furnace cooling (FC) were used after same solution treatment. Then these specimens received same two-step aging treatment. Influence of solution cooling method on the microstructure and stress rupture properties of the alloy under the test condition of 980 °C and 300 MPa was investigated. The microstructures of the samples were examined by scanning electron microscope (SEM). The results showed that the solution cooling method of heat treatment played an important role in the microstructure and stress rupture properties of the alloy. The size of γ′ phase and the width of the γ matrix channel of the alloy increased with decreasing cooling rate. The stress rupture properties of the alloy increased at first and decreased afterwards with decreasing cooling rate. The alloy with air cooling (AC) has the best stress rupture properties. The γ′ phase changed into a perfect raft structure during the stress rupture process of the specimens with AC method. However, the γ′ phase changed into a very irregular raft microstructure in the specimens with the water cooling (WC) and furnace cooling (FC) method. The micro-cracks in the specimen with irregular raft make the initiation and interconnection easier than that in the specimen with regular raft. Therefore, the alloy with AC method has optimum microstructure and stress rupture property.

Heat-to-Heat Variations in Creep-Rupture Properties of Annealed 2 1/4 Cr-1 Mo Steel

1983 ◽  
Vol 105 (4) ◽  
pp. 320-328
Author(s):  
R. L. Klueh
Keyword(s):  
Rupture Life ◽  
High Stress ◽  
Stress Rupture ◽  
Carbide Precipitation ◽  
Creep Rupture ◽  
Creep And Stress Rupture ◽  
Stress Rupture Properties ◽  
Data Scatter ◽  
Life Tests ◽  
Rupture Properties

The creep and creep-rupture properties of 13 heats of annealed 2 1/4 Cr-1 Mo steel were determined at 510 and 566°C (950 and 1050°F). The microstructures of all heats were primarily polygonal ferrite (75–80 percent); the balance was mostly bainite with 1–2 percent pearlite and scattered carbides. At each temperature the results indicated considerable data scatter for the high-stress (short rupture life) tests. As the stress was lowered, the creep and stress-rupture properties converged, which resulted in a decrease in the data scatter. Much of the variation and change in the properties could be attributed to the carbide precipitation reactions that occur in the steel.

The influence of trace elements on the creep and stress-rupture properties of Nimonic 105

1980 ◽  
Vol 295 (1413) ◽  
pp. 296-296
Keyword(s):  
Trace Elements ◽  
Stress Rupture ◽  
Creep And Stress Rupture ◽  
Close Collaboration ◽  
Pb Stress ◽  
Notched Specimens ◽  
Stress Rupture Properties ◽  
Rupture Properties ◽  
Stress Rupture Testing ◽  
Harmful Effects

The influence of certain trace elements, namely Pb, Sn, Te, Se and Tl, on the creep and stressrupture properties of Nimonic 105 was investigated at 815 °C. The work was supported by the Ministry of Defence, and was planned in close collaboration with Rolls-Royce, who advised, in particular, on the trace elements to be studied and the levels at which harmful effects on creep performance might be expected. The results obtained have confirmed that, with the exception of Sn, all the elements reduce the life to rupture and the ductility at failure when present in sufficient amount. The most deleterious impurities were Te and Pb. Stress-rupture testing with notched specimens gave a generally more sensitive indication of the presence of harmful amounts of impurity than did tests with plain specimens.

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