Creep characterization of a type 316 austenitic steel

Henderson, J.; Harwood, N.; Rooney, Dan

doi:10.1080/02619180.1987.11753363

Cited by 3 publications

(4 citation statements)

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“…His work also shows that strain at failure usually scatters over a wide range and changes with stress. The work of Henderson et al [13] reveals a similar conclusion. Furthermore, their research results show that at 550 8C the strain at failure reaches its lowest value in the region s ¼ 300 MPa:…”

Section: Creep Strain At Failuresupporting

confidence: 72%

“…However, there are only a few data points available, as discussed above, on each experimental curve at low stress. In order to predict reasonable minimum creep rates and lifetimes at low stress using the CDM model, a new relationship has been added to the optimisation functional equation (13). This new term includes the sum of the differences between the theoretical and experimental minimum creep rates and lifetimes.…”

Section: Treatment Of Minimum Creep Rates and Lifetimesmentioning

confidence: 99%

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Constitutive equations for time independent plasticity and creep of 316 stainless steel at 550°C

Hayhurst

Vakili‐Tahami

Zhou

2003

International Journal of Pressure Vessels and Piping

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The paper concerns the development of constitutive equations for 316 stainless steel at 550 8C; it, firstly, considers time independent plastic straining at high temperature; and, secondly, describes how mechanisms-based creep constitutive equations have been formulated. It is shown how a power-law hardening model may be used to describe the effects of prior plastic pre-strain, by providing excellent comparisons with the results of experiments. The paper then develops constitutive equations for time dependent creep based on the theory of continuum damage mechanics. The corresponding state variable rate equations have been selected to include a description of strain hardening in primary creep, a major contributor to strain in this material, and also softening due to creep constrained cavity growth. Despite the paucity of data at lower stresses, corresponding to lifetimes in the region of 10 5 h, a model has been formulated which gives good predictions of experimental results over a wide stress range. The paper discusses how the time independent and time dependent models may be combined in a finite element analysis code to predict inelastic straining due to initial loading and to stress redistribution encountered in reheat cracking of welded pressure vessels. q

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Section: Creep Strain At Failuresupporting

confidence: 72%

Section: Treatment Of Minimum Creep Rates and Lifetimesmentioning

confidence: 99%

Constitutive equations for time independent plasticity and creep of 316 stainless steel at 550°C

Hayhurst

Vakili‐Tahami

Zhou

2003

International Journal of Pressure Vessels and Piping

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“…The available uniaxial and biaxial creep data for Type 316 have been obtained from a variety of different sources. [9][10][11][12][13][14] For this reason they relate to four different heats although the test temperatures are similar, 593 and 600 • C. The published biaxial creep data for Type 304 4 were obtained from a single heat (ORNL Heat 9T2796) and temperature, 593 • C. There is, however, a considerable quantity of data on this heat, which span a range of stress states. The ductility and uniaxial data on this heat were not reported by Huddleston 4 and have been obtained from Refs [15][16][17][18][19][20][21][22][23][24].…”

Section: U Lt I a X I A L C R E E P D Ata F O R A U S T E N I T I Cmentioning

confidence: 99%

“…Thus, this study initially considered biaxial creep data from thin walled components and compared these with uniaxial data on the same heats of material. The available uniaxial and biaxial creep data for Type 316 have been obtained from a variety of different sources 9–14 . For this reason they relate to four different heats although the test temperatures are similar, 593 and 600 °C.…”

Section: Multiaxial Creep Data For Austenitic Stainless Steelsmentioning

confidence: 99%

The multiaxial creep ductility of austenitic stainless steels

Spindler¹

2004

Fatigue Fract Eng Mat Struct

140

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A B S T R A C T Calculations of creep damage under conditions of strain control are often carried out using either a time fraction approach or a ductility exhaustion approach. In practice, calculations of creep damage are further complicated by the presence of multiaxial states of stress. In the case of the time fraction approach, there are a number of models that can be used to predict the effect of state of stress on creep rupture strength. In particular, Huddleston developed a model from data on stainless steels. The R5 procedure uses a ductility exhaustion approach to calculate creep damage and includes a model for use under triaxial states of stress. The aim of this paper is to describe the development of this model, which is based on considerations of cavity nucleation and growth and was developed from multiaxial creep data on Type 304 and 316 steels. N O M E N C L A T U R Ed = grain size n = stress exponent for power law creep p, q = constants used in multiaxial creep strain at failure model r = creep cavity radius S i = principal deviatoric stresses, where i = 1-3 t f = time at failure γ = surface for the formation of a cavitȳ ε f = von Mises creep strain at failure ε fu = creep strain at failure of a uniaxial tesṫε av = average von Mises creep strain rate, σ p /σε c = instantaneous von Mises equivalent creep strain rate λ m = cavity spacing in multiaxial specimen λ uni = cavity spacing in uniaxial specimen σ = stress σ 1 , σ 2 and σ 3 = principal stresses, where σ 1 ≥ σ 2 ≥ σ 3 σ 0 = normalizing stress for isochronous failure surfaces σ = von Mises stress σ p = hydrostatic stress, (σ 1 + σ 2 + σ 3 )/3 I N T R O D U C T I O NMultiaxial creep data are used in design codes and assessment procedures that address creep-fatigue loading, for example ASME III, 1 RCC-MR 2 and R5. 3 In ASME III and RCC-MR, calculations of creep damage under conditions of strain control are carried out using a time fraction approach. The effect of multiaxial states of stress on rupture strength is predicted using the model due to Huddleston 4 in ASME III and the model due to Hayhurst et al. 5 inCorrespondence: M. W. Spindler.RCC-MR. The R5 procedure uses a ductility exhaustion approach to calculate creep damage and includes a model for use under triaxial states of stress. The aim of this paper is to describe the development of this model for the effect of multiaxial states of stress on creep ductility. The ductility exhaustion approach of R5 to calculate the creep damage per cycle, d c , arising from a creep dwell is given by

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Multi-axial creep of thick-walled tubes of type 316 austenitic steel at 600°C

Henderson¹

1990

High Temperature Technology

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Creep characterization of a type 316 austenitic steel

Cited by 3 publications

References 0 publications

Constitutive equations for time independent plasticity and creep of 316 stainless steel at 550°C

Constitutive equations for time independent plasticity and creep of 316 stainless steel at 550°C

The multiaxial creep ductility of austenitic stainless steels

Multi-axial creep of thick-walled tubes of type 316 austenitic steel at 600°C

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