Variable Temperature Creep and Creep Recovery of 304 Stainless Steel

1984 ◽  
Vol 106 (4) ◽  
pp. 393-396 ◽  
Author(s):  
U. W. Cho ◽  
W. N. Findley
Keyword(s):  
Stainless Steel ◽  
Temperature Increase ◽  
Variable Temperature ◽  
Superposition Principle ◽  
304 Stainless Steel ◽  
Temperature History ◽  
Effect Of Temperature ◽  
Creep Recovery ◽  
Temperature Creep ◽  
Dependent Theory

Creep and creep recovery data are reported for pure tension of 304 stainless steel under variable temperature between 593°C and 649°C. Varying temperature experiments involved multiple steps of abrupt temperature increase and decrease at a constant stress of 86.2 MPa (12.5 ksi). A temperature-compensated time proposed by Sherby and Dorn was employed to represent the effect of temperature. The temperature history dependent theory combined with the modified superposition principle was used to predict the variable temperature creep and creep recovery from data under constant temperature. The test data were predicted reasonably well by the theory.

Creep and Creep Recovery of 2618-T61 Aluminum Under Variable Temperature

1984 ◽  
Vol 51 (4) ◽  
pp. 816-820 ◽  
Author(s):  
U. W. Cho ◽  
W. N. Findley
Keyword(s):  
Activation Energy ◽  
Aluminum Alloy ◽  
Apparent Activation Energy ◽  
Variable Temperature ◽  
Constant Stress ◽  
Temperature History ◽  
Effect Of Temperature ◽  
Creep Recovery ◽  
Dependent Theory ◽  
Using Data

Creep and creep recovery data are reported for pure tension of 2618-T61 aluminum alloy under variable temperature between 200° C and 230° C. Varying temperature experiments involved an abrupt temperature increase and a linearly increasing and decreasing temperature at a constant stress of 137.9 MPa (20 ksi). A temperature-compensated time by Sherby and Dorn was employed to represent the effect of temperature. A temperature-history-dependent theory using data from constant stress creep and creep recovery together with the apparent activation energy was used to predict the creep under variable temperature. The predictions agreed quite well with the observed data. The apparent activation energy of this alloy was found to be 49,000 cal/mole°K.

Creep and Creep Recovery of 304 Stainless Steel Under Combined Stress With a Representation by a Viscous-Viscoelastic Model

1980 ◽  
Vol 47 (4) ◽  
pp. 755-761 ◽  
Author(s):  
U. W. Cho ◽  
W. N. Findley
Keyword(s):  
Stainless Steel ◽  
Viscoelastic Model ◽  
Multiple Integral ◽  
Time Dependent ◽  
304 Stainless Steel ◽  
Creep Recovery ◽  
Strain Component ◽  
Stress Dependence ◽  
Nonlinear Stress ◽  
Stress States

Creep and creep-recovery data of 304 stainless steel are reported for experiments under constant combined tension and torsion at 593°C (1100°F). The data were represented by a viscous-viscoelastic model in which the strain was resolved into five components—elastic, plastic (time-independent), viscoelastic (time-dependent recoverable), and viscous (time-dependent nonrecoverable) which has separate positive and negative components. The data are well represented by a power function of time for each time-dependent strain. By applying superposition to the creep-recovery data, the recoverable creep strain was separated from the nonrecoverable. The form of stress-dependence associated with a third-order multiple integral representation was employed for each strain component. The time-dependent recoverable and nonrecoverable strains had different nonlinear stress dependence; but, the time-independent plastic strain and time-dependent nonrecoverable strain had similar stress-dependence. A limiting stress below which creep was very small or negligible was found for both recoverable and nonrecoverable components as well as a yield limit. The limit for recoverable creep was substantially less than the limits for nonrecoverable creep and yielding. The results showed that the model and equations used in the analysis described quite well the creep and creep-recovery under the stress states tested.

scholarly journals Energy Coupling of Laser Radiation on AISI 304 Stainless Steel: Effect of High Temperatures and Surface Oxidation

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2802 ◽  
Author(s):  
Hipp ◽  
Mahrle ◽  
Beyer
Keyword(s):  
Stainless Steel ◽  
Melting Point ◽  
High Temperatures ◽  
Coupling Efficiency ◽  
Surface Oxidation ◽  
Energy Coupling ◽  
304 Stainless Steel ◽  
Effect Of Temperature ◽  
Laser Material Processing ◽  
Laser Materials

The industrial application of laser materials processing methods is still far ahead of research into the physical phenomena occurring during these processes. In particular, the effect of high temperatures on the energy coupling of laser irradiation of metals is poorly understood. However, most processes in laser materials treatment involve temperatures above the melting point or even cause evaporation. This study therefore evaluates the effect of high temperatures on the energy coupling efficiency of stainless steel experimentally for three typical laser wavelengths (515 nm, 1.07 µm, 10.6 µm). As a result, it is shown that the effect of temperature on the energy coupling efficiency depends on the wavelength. In this context the relevance of the X-point phenomenon known from the emissivity theory could be demonstrated for laser material processing. Further, the effect of a process-induced surface oxidation is analyzed. At temperatures above 650 °C the energy coupling efficiency dramatically increases to around 65% at melting point and stays at this high level even in the liquid phase.

Effect of Temperature on Strength and Residual Stress Distribution in Silicon Nitride to 304 Stainless Steel Brazed Joints

2004 ◽  
Vol 449-452 ◽  
pp. 881-884 ◽  
Author(s):  
Do Won Seo ◽  
Ho Chel Yoon ◽  
Jin Yi Lee ◽  
Jae Kyoo Lim
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
High Temperature ◽  
Silicon Nitride ◽  
Residual Stresses ◽  
Bending Strength ◽  
304 Stainless Steel ◽  
Effect Of Temperature ◽  
High Temperature Strength ◽  
Mechanical And Thermal Properties

Ceramics are significantly used in many industrial applications due to their excellent mechanical and thermal properties such as high temperature strength, low density, high hardness, low thermal expansion and good corrosion properties. To combine the specific advantages of ceramics with that of metals, they are often used together within one composite component. In this study, the effect of temperature on fracture characteristics of silicon nitride joined to 304 stainless steel brazed with Ti active alloy are investigated in room and high temperature regions. And analytical studies on the residual stress of dissimilar brazed joint are performed by the finite element method. Four-point bending strength and deflection of interlayer increase with increasing strain rate in room temperature. As the test temperature increases, the bending strength decreases, but the deflection of interlayer is almost constant. The residual stresses redistribute after cutting of joint and the maximum tensile stress occurs on the new free surface at the ceramic near the interface. The singularity of residual stresses at the ceramic near the interface is characterized by elastic-plastic properties of ceramic and inserted materials.­

Effect of Temperature and Chloride Content on the Stress Corrosion Cracking Susceptibility of 304 Stainless Steel Welded Joints Treated by Ultrasonic Impact Treatment

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Gang Ma ◽  
Xiang Ling
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Welded Joints ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Chloride Ion ◽  
Chloride Content ◽  
304 Stainless Steel ◽  
Effect Of Temperature ◽  
Ultrasonic Impact Treatment

Effect of temperature and chloride content on the stress corrosion cracking (SCC) susceptibility of 304 stainless steel welded joints treated by ultrasonic impact treatment (UIT) is investigated in this study. High tensile weld residual stress is an important factor contributing to SCC. UIT can produce compressive stresses on the surface of welded joints that negate the tensile stresses to enhance the SCC resistance of welded joints. In the SCC testing, the specimens were immersed in sodium chloride solution at the temperatures of 200 °C–280 °C in the range of sodium chloride solution from 50 g/L to 200 g/L. During the testing, treated specimens show good SCC resistance with different temperature and consistency of chloride ion. The results show that the SCC susceptibility of 304 stainless steel welded joints reduces with increase of temperature and decrease of chloride ion consistency. The surface roughness of sample after UIT was investigated by portable surface roughness tester. The results reveal that surface of the samples becomes rougher than the original plate with the increase of the impact duration, which contribute to the pitting corrosion of treated specimens. And, the level of pitting corrosion is reduced with increase of temperature.

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