Creep-Rupture Behavior of Unnotched and Notched Nickel-Base Alloys in Air and in Vacuum

1965 ◽  
Vol 87 (2) ◽  
pp. 344-350 ◽  
Author(s):  
P. Shahinian
Keyword(s):  
Heat Treatment ◽  
Low Temperatures ◽  
Rupture Life ◽  
High Strength ◽  
Creep Rupture ◽  
Atmosphere Effect ◽  
Nickel Base ◽  
Test Atmosphere ◽  
Rupture Properties ◽  
Rupture Behavior

The influence of test atmosphere on creep-rupture properties was determined for plain and notched bars of nickel, Nichrome V, Udimet 500, and Inconel X. The rupture life of nickel and of Nichrome V was shorter in air than in vacuum at relatively low temperatures, but at high temperatures it was longer in air. While both types of specimen geometry were generally affected alike by atmosphere, a larger atmosphere effect was observed for notched bars of the two materials in the air-strengthened region. The Udimet 500 and the high-strength Inconel X alloys at 1500 deg F were slightly stronger in vacuum than in air. However, the Inconel X with a modified heat-treatment displayed a reversal in the atmosphere effect. It was observed that all the materials generally develop intergranular cracks more readily in air than in vacuum.

Capped End, Thin-Wall Tube Creep-Rupture Behavior for Type 316 Stainless Steel

1963 ◽  
Vol 85 (1) ◽  
pp. 71-86 ◽  
Author(s):  
G. H. Rowe ◽  
J. R. Stewart ◽  
K. N. Burgess
Keyword(s):  
Biaxial Tension ◽  
Rupture Life ◽  
Creep Rupture ◽  
Uniaxial Tensile ◽  
Thin Wall ◽  
Rupture Ductility ◽  
Statistical Argument ◽  
Stress Ratios ◽  
Rupture Properties ◽  
Rupture Behavior

The creep-rupture behavior of 34 capped end, thin-wall tubular specimens was correlated with results for 54 uniaxial tensile specimens in tests at 1350 F, 1500 F, and 1650 F. Basic tests established isotropy in creep-rupture properties as well as metallurgical stability for the material used in the study. Significant correlations of creep rate, rupture life, and rupture ductility were established for the cases of stress ratios 1/0 and 2/1 in the biaxial tension quadrant. Data from tests at 1500 F were evaluated for a statistical argument. This same material was subsequently utilized in a high temperature structures research program to be reported separately.

scholarly journals Creep rupture properties of bare and coated polycrystalline nickel-based superalloy Rene®80

2021 ◽  
pp. 36-36
Author(s):  
M.M. Barjesteh ◽  
S.M. Abbasi ◽  
K.Z. Madar ◽  
K. Shirvani
Keyword(s):  
Elevated Temperatures ◽  
Life Time ◽  
Creep Rupture ◽  
Polycrystalline Nickel ◽  
Creep Life ◽  
Nickel Based Superalloy ◽  
Platinum Aluminide ◽  
Rupture Properties ◽  
Low Activity ◽  
Rupture Behavior

Creep deformation is one of the life time limiting reasons for gas turbine parts that are subjected to stresses at elevated temperatures. In this study, creep rupture behavior of uncoated and platinum-aluminide coated Rene?80 has been determined at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 Mpa in air. For this purpose, an initial layer of platinum with a thickness of 6?m was applied on the creep specimens. Subsequently, the aluminizing were formed in the conventional pack cementation method via the Low Temperature-High Activity (LTHA) and High Temperature-Low Activity (HTLA) processes. Results of creep-rupture tests showed a decrease in resistance to creep rupture of coated specimen, compared to the uncoated ones. The reductions in rupture lives in LTHA and HTLA methods at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 MPa were almost (26% and 41.8%), (27.6% and 38.5%) and (22.4% and 40.3%), respectively as compared to the uncoated ones. However, the HTLA aluminizing method showed an intense reduction in creep life. Results of fractographic studies on coated and uncoated specimens indicated a combination of ductile and brittle failure mechanisms for all samples. Although, the base failure mode in substrate was grain boundary voids, cracks initiated from coating at 760?C/657MPa and 871?C/343. No cracking in the coating was observed at 982?C/190MPa.

Effect of Melt Treatment on the Microstructure and Creep-Rupture Behavior of M963 Cast Nickel-Base Superalloy

2004 ◽  
Vol 449-452 ◽  
pp. 553-556
Author(s):  
Heng Rong Guan ◽  
Feng Shi Yin ◽  
Xiao Feng Sun ◽  
Zhuang Qi Hu
Keyword(s):  
Creep Rupture ◽  
Striking Difference ◽  
Nickel Base Superalloy ◽  
Air Cooling ◽  
Melt Treatment ◽  
Heat Treated ◽  
Treatment Changes ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Rupture Behavior

The effect of melt treatment on the microstructure and creep-rupture behavior of M963 superalloy at 1248K under 225MPa has been investigated. The microstructure of the as-cast superalloy without melt treatment consists of γ solid solution matrix, γ´precipitate, coarse blocky MC carbide and (γ+γ´)eutectic. The striking difference in microstructure is that the melt treatment changes the MC carbide from the coarse blocky morphology into the fine script-like morphology. After heat-treated at 1483K for 4h followed by air-cooling, both the creep life and rupture elongation of the melt-treated alloy are all doubled those of the alloy without melt treatment. The mechanism of the melt treatment on the creep-rupture behavior of the M963 superalloy is discussed.

scholarly journals Prediction of Creep Rupture Life in Nickel-Base Superalloys Using Bayesian Neural Network

1999 ◽  
Vol 63 (7) ◽  
pp. 905-911 ◽  
Author(s):  
Hidetoshi Fujii ◽  
David J. C. MacKay ◽  
Harshad K. D. H. Bhadeshia ◽  
Hiroshi Harada ◽  
Kiyoshi Nogi
Keyword(s):  
Neural Network ◽  
Rupture Life ◽  
Creep Rupture ◽  
Bayesian Neural Network ◽  
Nickel Base Superalloys ◽  
Nickel Base

Creep Rupture Behavior of Selected Turbine Materials in Air, Ultra-High Purity Helium, and Simulated Closed Cycle Brayton Helium Working Fluids

1981 ◽  
Vol 103 (2) ◽  
pp. 331-337 ◽  
Author(s):  
R. L. Ammon ◽  
L. R. Eisenstatt ◽  
G. O. Yatsko
Keyword(s):  
High Purity ◽  
Creep Rupture ◽  
Working Fluid ◽  
Closed Cycle ◽  
Working Fluids ◽  
Ultra High Purity ◽  
Rupture Properties ◽  
Rupture Behavior

Five turbine materials, IN100, 713LC, MAR-M-509, MA-754 and TZM were selected as candidate materials for use in a Compact Closed Cycle Brayton System (CCCBS) study in which helium served as the working fluid. The suitability of the alloys to serve in the CCCBS environment at 927 C (1700 F) was evaluated on the basis of creep-rupture tests conducted in air, ultra-high purity helium (>99.9999 percent), and a controlled impurity helium environment. Baseline reference creep rupture properties for times up to 10,000 hr were established in a static ultra-high purity helium environment.

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