Influence of Microstructural Inhomogeneity on the Creep Rupture Behaviour of 316LN SS Weld Joints

The creep rupture behaviour,hardness distribution and microstructure of weldment made by submerge arc welding for W strengthened P92 steel are described in this paper. The cross-weld creep tests were carried out at 923K under stresses in the ranges 130-100MPa. For stress below 120MPa, weld-joints were ruptured by the Type crack, which located in their fine-grained heat affected zone(FGHAZ)with the smallest measured cross-weld hardness. A strong drop in creep rupture strength of weldment was induced by brittle type failure. In addition to coarsening of M23C6 carbides and an equiaxed fine grains in FGHAZ, intermetallic Fe2(Mo,W)Laves phase precipitated on grain boundaries during creep is probably the significant factor caused the type failure.

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Application and Standard Error Analysis of the Parametric Methods for Predicting the Creep Life of Type 316LN SS

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.297-300.2272 ◽

2005 ◽

Vol 297-300 ◽

pp. 2272-2277 ◽

Cited By ~ 8

Author(s):

Woo Gon Kim ◽

Song Nam Yoon ◽

Woo Seog Ryu

Keyword(s):

Experimental Data ◽

Standard Error ◽

Rupture Life ◽

Large Error ◽

Creep Rupture ◽

Parametric Methods ◽

Creep Life ◽

Statistical Process ◽

316Ln Ss ◽

Type 316Ln Stainless Steel

To predict the creep-rupture life of type 316LN stainless steels which are major structural components of liquid metal reactors, a number of creep-rupture data were collected through literature survey and experimental data of KAERI. Using the data, the creep-rupture life was analyzed by means of the Larson-Miller, the Orr-Sherby-Dorn and the Manson-Haferd parametric methods. Polynomial equations for predicting the creep life were obtained. In order to analyze the acceptance and use of the parametric methods, standard error values were accurately investigated by statistical process of the creep data. As for the results, the three parametric methods are found to be favorable in predicting the creep life of type 316LN stainless steel. Each method did not generate a large error in the standard error of the estimate with variations of the temperatures, but the Orr-Sherby-Dorn and the Manson-Haferd methods showed a better agreement than the Larson-Miller one. Especially, at higher the 700oC, the Manson-Haferd method conformed well to the experimental data. The reason is because the Manson-Haferd method includes two constants of ta and Ta.

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High temperature tensile test and creep rupture strength prediction of T92/Super304H dissimilar steel weld joints

Materials at High Temperatures ◽

10.1179/0960340913z.0000000009 ◽

2014 ◽

Vol 31 (1) ◽

pp. 69-75 ◽

Cited By ~ 1

Author(s):

X. L. Bai ◽

Q. Zhang ◽

G. H. Chen ◽

J. Q. Wang ◽

J. J. Liu ◽

...

Keyword(s):

High Temperature ◽

Tensile Test ◽

Rupture Strength ◽

Creep Rupture ◽

Strength Prediction ◽

Steel Weld ◽

Creep Rupture Strength ◽

Dissimilar Steel ◽

Weld Joints ◽

High Temperature Tensile

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Studies on Creep Deformation and Rupture Behavior of 316LN SS Multi-Pass Weld Joints Fabricated with Two Different Electrode Sizes

Metallurgical and Materials Transactions A ◽

10.1007/s11661-016-3862-3 ◽

2016 ◽

Vol 48 (2) ◽

pp. 706-721 ◽

Cited By ~ 2

Author(s):

V. D. Vijayanand ◽

J. Ganesh Kumar ◽

P. K. Parida ◽

V. Ganesan ◽

K. Laha

Keyword(s):

Creep Deformation ◽

Weld Joints ◽

316Ln Ss ◽

Rupture Behavior

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Creep-Life Prediction of Type 316LN Stainless Steel by Minimum Commitment Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.1313 ◽

2006 ◽

Vol 326-328 ◽

pp. 1313-1316 ◽

Cited By ~ 1

Author(s):

Woo Gon Kim ◽

Song Nan Yin ◽

Woo Seog Ryu ◽

Won Yi

Keyword(s):

Focal Point ◽

Rupture Life ◽

Creep Rupture ◽

316Ln Ss ◽

Creep Life Prediction ◽

Long Time ◽

Prediction Curve ◽

Type 316Ln Stainless Steel ◽

Term Creep ◽

Short Term Creep

This paper presents the results of the Minimum Commitment Method (MCM) applied to predict the creep rupture life of type 316LN SS. Constant A, and the function of P(T) and G(σ) being used in the MCM equation were determined. To determine a proper value of the constant A, a focal point method and a trial and error one were adopted, respectively. It was found to be A=-0.02~-0.05 for type 316LN SS. Each prediction curve with the A values were presented up to 106 hours and compared to the experimental data at each temperature. Using the short-term creep rupture data for under 2,000 hours, a long-time rupture reaching up to 106 hours was predicted by the MCM.

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