Creep Constitutive Equation for 2- Materials of Weldment-304L Stainless Steel

In this paper, creep constitutive equations of base (Parent) and weld materials of the weldment for cold-drawn 304L stainless steel have been obtained experimentally. For this purpose, test samples have been generated from cold drawn bars and weld material according to the ASTM standard. The creep behavior and properties have been examined for these materials by conducting uniaxial creep tests. Constant temperatures and constant load uni-axial creep tests have been carried out at two high temperatures, 680 and 720 oC, subjected to constant loads, which produce initial stresses ranging from 240 to 360 MPa. The experimental data have been used to obtain the creep constitutive parameters using numerical optimization techniques.

Authors:

• Amir Hossein Daei Sorkhabi
• Farid Vakili Tahami

Keywords:

• Creep
• Constitutive equation
• Cold-drawn 304L stainless steel
• Weld
• Base material

References:

[1] W. Sun, T. H. Hyde, A. A. Becker, and J. A. Williams, "Steady state
creep reference rupture stresses for internally pressurized pipes for use
in life prediction," Int. J. of Pressure Vessels and Piping, 79, 135-143,
2002.
[2] J. Hald, "Microstructure and long-term creep properties of 9-12% Cr
steels," Int. J. of Pressure Vessels and Piping, 85, 30-37, 2008.
[3] R. Agamennone, W. Bluma, C. Guptab, and J. K. Chakravartty,
"Evolution of microstructure and deformation resistance in creep of
tempered martensitic 9-12%Cr-2%W-5%Co steels," Acta Material, 54,
3003-3014, 2006.
[4] R. J. Hayhurst, R. Mustata, and D. R. Hayhurst, "Creep constitutive
equations for parent, Type IV, R-HAZ, CG-HAZ and weld material in
the range 565-640ºC for Cr-Mo-V weldments," Int. J. of Pressure
Vessels and Piping, 82, 137-144, 2005.
[5] K. Kimura, H. Kushima, and K. Sawada, "Long-term creep deformation
property of modified 9Cr-1Mo steel," Material Science and Engineering
A, 510-511, 58-63, 2009.
[6] A. F. Padilha, D. M. Escriba, E. Materna-Morris, M. Rieth, and M.
Klimenkov, "Precipitation in AISI 316L(N) during creep tests at 550ºC
and 600ºC up to 10 years," Journal of Nuclear Materials, 362, 132-138,
2007.
[7] S. Latha, M. D. Mathewa, P. Parameswaran, K. Bhanu Sankara Rao,
and S. L. Mannan, "Thermal creep properties of alloy D9 stainless steel
and 316 stainless steel fuel clad tubes," Int. J. of Pressure Vessels and
Piping, 85, 866-870, 2008.
[8] D. R. Hayhurst, F. Vakili-Tahami, and J. Q. Zhou, "Constitutive
equations for time independent plasticity and creep of 316 stainless steel
at 550ºC," Int. J. of Pressure Vessels and Piping, 80, 97-109, 2003.
[9] S. R. Holdsworth, M. Askins, A. Baker, E. Gariboldi, S. Holmstrom, A.
Klenk, M. Ringel, G. Merckling, R. Sandstrom, M. Schwienheer, and S.
Spigarelli, "Factors influencing creep model equation selection," Int. J.
of pressure vessels and piping, 85, 80-88, 2008.
[10] J. T. Boyle, and J. Spence, "Stress analysis for creep, Butterworth &
Co," (publishers) Ltd, 1983.
[11] J. F. Sobrinho, dos Reis, and L. O. Bueno, "Correlation between creep
and hot tensile behavior for 2.25Cr-1Mo steel from 500ºC to 700ºC,"
Part 2: An assessment according to different parameterization
methodologies. Revista Matéria, 10, n. 3, 463 - 471, 2005.
[12] F. R. Larson, and J. Miller, "A time-temperature relationship for rupture
and creep stresses, Trans," ASME, 74, 765-771, 1952.
[13] ASTM E8M-04, "Standard test methods for tension testing of metallic
materials (metric), Annual Book of ASTM Standards," ASTM
International, West Conshohocken, PA, USA, 2004.
[14] ASTM E139-06, "Standard test methods for conducting creep, creeprupture,
and stress-rupture tests of metallic materials, Annual Book of
ASTM Standards," ASTM International, West Conshohocken, PA,
USA, 2006.
[15] ASTM A276 - 05a, "Standard Specification for Stainless Steel Bars and
Shapes, Book of Standards Volume: Vol. 02.04," ASTM International,
West Conshohocken, PA, USA, 2005.