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.

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.

The effect of residuals on the elevated temperature properties of some creep resistant steels

1980 ◽  
Vol 295 (1413) ◽  
pp. 279-288 ◽  
Keyword(s):  
Elevated Temperature ◽  
Rupture Life ◽  
Creep Rupture ◽  
Austenitic Steels ◽  
Individual Element ◽  
Nitrogen And Phosphorus ◽  
Rupture Ductility ◽  
Aluminium Copper ◽  
Creep Resistant Steels ◽  
Rupture Properties

The effect of residuals and other deliberate minor additions on the elevated temperature properties of austenitic, CrMo and CrMoV steels is reviewed and those that affect these properties are identified. The elements boron, molybdenum, nitrogen and phosphorus in austenitic steels all increased creep rupture life although only boron and molybdenum were beneficial to rupture ductility. In the ferritic steels the embrittling elements antimony, arsenic, phosphorus and tin were considered together with aluminium, copper, silicon, titanium and boron. It is apparent that the effect of an individual element on creep rupture properties is dependent on the other elements present. However, in a 1 %CrMoVTiB steel additions of copper plus nickel and arsenic plus tin decrease rupture life although only the latter two reduce ductility. Similarly, in a 2 1/4% Cr1% Mo steel arsenic has a detrimental effect on ductility and tin and phosphorus have been identified as segregating to prior austenite grain boundaries. In contrast, silicon in a 2 1/4%Cr1 %Mo steel can improve ductility. Aluminium can improve both the creep life and ductility of 1 %CrMoVTiB steels, as can boron in the presence of titanium.

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.

Creep-Rupture Properties, Resistance to Temper Embrittlement and to Attack by Hydrogen of a 1.4 Percent Mn — 0.25 Percent Mo — 0.03 Percent Cb Steel

1975 ◽  
Vol 97 (3) ◽  
pp. 234-244 ◽  
Author(s):  
T. Wada ◽  
D. L. Sponseller
Keyword(s):  
Carbon Steel ◽  
Rupture Strength ◽  
Temper Embrittlement ◽  
Charpy Impact ◽  
Creep Rupture ◽  
Hydrogen Attack ◽  
Boiler Steel ◽  
Rupture Ductility ◽  
Treated Carbon ◽  
Rupture Properties

A laboratory heat of an improved boiler steel containing 0.13 percent C, 1.36 percent Mn, 0.27 percent Mo, 0.03 percent Cb, and 0.010 percent N was prepared; creep-rupture properties, resistance to temper embrittlement and resistance to hydrogen attack were investigated. The rupture strength was much higher than that of carbon steel and columbium-treated carbon steel, but was somewhat lower than that of two European carbon-0.3 percent Mo boiler steels. Creep-rupture ductility was high. The experimental steel exhibited high toughness, especially in the normalized and stress-relieved condition. No temper embrittlement was induced by step-cooling normalized or normalized and stress-relieved material. Good resistance to hydrogen attack was revealed by tests in a hydrogen autoclave at a pressure of 1000 psi (6.9 N/mm2); the steel retained the original Charpy impact toughness after exposures up to 5000 hr at 900 deg F (480 deg C) and 500 hr at 1000 deg F (540 deg C). No blistering or fissuring were observed.

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.

Trends and Implications of Data on Notched-Bar Creep Rupture

1962 ◽  
Vol 84 (2) ◽  
pp. 207-213 ◽  
Author(s):  
H. R. Voorhees ◽  
J. W. Freeman ◽  
J. A. Herzog
Keyword(s):  
Air Force ◽  
Rupture Life ◽  
Creep Rupture ◽  
University Of Michigan ◽  
Notched Specimens ◽  
Test Conditions ◽  
Unnotched Specimen ◽  
The University ◽  
Quantitative Explanation ◽  
Rupture Behavior

Extended research on creep rupture of notched specimens, conducted at the University of Michigan under Air Force sponsorship, is analyzed along with recent publications of others. The combined results suggest that notch strengthening is general for all alloys studied under some test conditions and is not specific to individual materials or to a given ductility level. Quantitative explanation of notch rupture behavior in terms of unnotched-specimen properties is handicapped by present uncertainties in the basic factors controlling creep-rupture life under variable multiaxial stress.

Effects of Surface Recrystallization on the Microstructures and Creep Properties of Single Crystal Superalloy DD6

2010 ◽  
Vol 638-642 ◽  
pp. 2279-2284
Author(s):  
Jia Rong Li ◽  
Feng Li Sun ◽  
Ji Chun Xiong ◽  
Shi Zhong Liu ◽  
Mei Han
Keyword(s):  
Single Crystal ◽  
Annealing Temperature ◽  
Low Cost ◽  
Rupture Life ◽  
Creep Rupture ◽  
Single Crystal Superalloy ◽  
Recrystallization Temperature ◽  
Creep Properties ◽  
Grit Blasting ◽  
Rupture Properties

This work assesses the effects of the surface recrystallization of the processing of water grit blasting, grit blasting and mechanically polishing on the microstructures and creep rupture properties of DD6 alloy, a low-cost second generation single crystal superalloy. The results demonstrate that the possibility and the depth of the surface recrystallization of DD6 show an increase as the annealing temperature increases from 1050°C to 1250°C. No surface recrystallization happens when the specimens of the alloy have been undergone at 1100°C for 4 hours after water grit blasting, but the surface recrystallization occurs at the annealing temperature above 1200°C for 4 hours after water grit blasting. The test indicates that the increasing pre-deformation decreases the surface recrystallization temperature. The creep rupture life of DD6 alloy without processing is 274.4 hours, 341.1 hours at the conditions of 980°C/250MPa, 1070°C/140MPa respectively. After annealing at 1100°C for 4 hours, the creep rupture life of the alloy with the processing of water grit blasting is equivalent to that of the alloy without processing. The surface recrystallization of the alloy happens with the processing of grit blasting after the annealing at 1100°C for 4 hours, and there is a reduction of the creep rupture life at the conditions as mentioned above. The creep properties of DD6 alloy meet the needs of blades and vanes of single crystal for advanced aeroengines when the surface recrystallization of the alloy occurs during manufacturing and processing.

Creep-Rupture Behavior of Six Candidate Stirling Engine Superalloys Tested in Air

1984 ◽  
Vol 106 (1) ◽  
pp. 50-58 ◽  
Author(s):  
S. Bhattacharyya
Keyword(s):  
Creep Rate ◽  
Minimum Creep Rate ◽  
Rupture Life ◽  
Stirling Engine ◽  
Creep Rupture ◽  
Similar Data ◽  
Alloy 800H ◽  
Different Temperatures ◽  
Cast Alloys ◽  
Rupture Behavior

The creep-rupture behavior of six candidate Stirling engine iron-base superalloys was determined in air. The alloys included four wrought alloys (A-286, Alloy 800H, N-155, and 19-9DL) and two cast alloys (CRM-6D and XF-818). The specimens were tested to rupture for times up to 3000 h at 650° to 925°C. Rupture life (tr), minimum creep rate (ε˙m), and time to 1 percent creep strain (t0.01), were statistically analyzed as a function of stress and temperature. Estimated stress levels at different temperatures to obtain 3500 h tr and t0.01 lives were determined. These data will be compared with similar data being obtained under 15 MPa hydrogen.

scholarly journals Influence of normalizing and tempering temperatures on the creep properties of P92 steel

2020 ◽  
Vol 39 (1) ◽  
pp. 178-188
Author(s):  
Lakshmiprasad Maddi ◽  
Atul Ramesh Ballal ◽  
Dilip Ramkrishna Peshwe ◽  
M. D. Mathew
Keyword(s):  
Power Plants ◽  
Rupture Strength ◽  
Rupture Life ◽  
Creep Rupture ◽  
Laves Phases ◽  
P92 Steel ◽  
Creep Properties ◽  
Martensitic Microstructure ◽  
Actual Service ◽  
Rupture Properties

AbstractP92 steel is used as a piping material in ultra super critical power plants that can be operated at steam temperatures up to 650°C. The changes in the martensitic microstructure of P92 steel must be evaluated thoroughly before it is put into actual service. In this study, indigenously developed P92 steel was used. The steel was subjected to normalizing and tempering heat treatments in the range of 1,040–1,060°C and 740–780°C. The changes in the microstructure were evaluated and creep-rupture properties were studied at test temperatures of 600 and 650°C. Although normalizing temperatures influenced the microstructure and creep strength marginally, the change in tempering temperatures led to significant changes. The creep rupture strength at 600°C was influenced largely by the changes in the dislocation substructure, while the precipitation of Laves phases was a significant observation made for 650°C test temperature. Proposed mechanisms for the microstructural evolution and its consequences on the rupture life are discussed in this study.

The Effect of Stress Concentrations on the Creep Rupture of Tension Panels

1975 ◽  
Vol 42 (3) ◽  
pp. 613-618 ◽  
Author(s):  
D. R. Hayhurst ◽  
C. J. Morrison ◽  
F. A. Leckie
Keyword(s):  
Steady State ◽  
High Temperatures ◽  
Lower Bounds ◽  
Plane Stress ◽  
Rupture Life ◽  
Creep Rupture ◽  
Stress Concentrations ◽  
Engineering Structures ◽  
Aluminum Plates ◽  
Rupture Behavior

The creep rupture behavior of metals at high temperatures is reviewed for constant homogeneous states of multiaxial stress. Currently used methods for estimating the creep rupture life of engineering structures are discussed. The rupture lives of plane stress tension plates containing discontinuities are predicted by the different methods. The estimates of life are compared with the results of experiments carried out on copper and aluminum plates. It is shown that the magnitudes of the elastic and steady-state stresses do not influence the rupture behavior of the tension plates examined. The redistribution of stress in the structures which occurs due to tertiary creep plays an important part in determining the rupture lives. A method of predicting lower bounds on the structural rupture lives is presented and shown to closely predict the results of experiments.

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