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Research Papers: Materials and Fabrication

Creep Behavior of P92 and P92 Welds at 675 °C

[+] Author and Article Information
David W. J. Tanner

e-mail: david.tanner@bristol.ac.uk

Mohammed Saber

e-mail: mohammed.saber@eng.psu.edu.eg

Wei Sun

e-mail: w.sun@nottingham.ac.uk

Thomas H. Hyde

e-mail: thomas.hyde@nottingham.ac.uk

Materials, Mechanics, and
Structures Research Division,
Faculty of Engineering,
The University of Nottingham,
Nottingham, NG7 2RD, UK

1Present address: Department of Mechanical Engineering, University of Bristol, Bristol, BS8 1TR, UK.

2Present address: Faculty of Engineering, Port Said University, Port Said, Egypt.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received August 16, 2012; final manuscript received May 16, 2013; published online September 16, 2013. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 135(5), 051404 (Sep 16, 2013) (8 pages) Paper No: PVT-12-1129; doi: 10.1115/1.4024640 History: Received August 16, 2012; Revised May 16, 2013

The results of an accelerated creep test programme on the leading new build high temperature power plant pipework ferritic steel P92 and two P92 welds are presented. Tests were performed at 675 °C, which is above the service operating temperature range recommended for P92, but allowed for more realistic operating stresses to be used. Comparison with similar tests of P92 at lower temperatures has shown that testing at 675 °C produces the same general creep behavior, and can therefore be used for component life assessments in the service operating temperature range. Axially loaded parent P92 material uniaxial round bar and notched bar specimens, given a heat treatment equivalent to that given postwelding, are compared with weld metal (WM) specimens and cross-weld (C-W) specimens extracted from welds made using both a similar P92 consumable and a dissimilar IN625 nickel alloy consumable. Both welds exhibited typical premature ferritic steel weld failure at the heat-affected zone (HAZ) and parent material (PM) interface, known as type IV. The creep crack growth (CCG) behavior of parent material, weld metal, and the HAZ was studied using compact tension (CT) specimens. Impression testing was performed to determine the relative creep behavior of the HAZ. The HAZ was found to have the highest minimum creep strain rates and creep crack growth rates, indicating the relative weakness of this region.

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References

Figures

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Fig. 1

Groove weld geometry

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Fig. 2

Dimensions of axially loaded tensile creep specimens (mm)

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Fig. 3

Geometries of CT specimens (mm): (a) PM specimen (left), side view of a grooved specimen (right) and (b) C-W specimen

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Fig. 4

Sampling of C-W CT specimens: pipe groove weld (left) and groove weld cross-section (right)

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Fig. 5

HAZ impression creep specimen geometry and position in the groove weld

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Fig. 6

Creep stress–rupture time plot for PM and WMs

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Fig. 7

Creep stress–rupture time plot for P92 PM, WM, and C-Ws

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Fig. 8

Photomacrograph of a failed dissimilar weld C-W tensile creep specimen

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Fig. 9

Cracked surfaces of CT specimens: P92 PM (CT1-CT5), C-W (CT6-CT13), P92 WM (CTWM1-CTWM3)

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Fig. 10

Comparison between PM CT3 and similar weld C-W CT9, both loaded with 3000 N (a) and (b) load-line displacement, (c) CCG, and (d) CCG rates

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Fig. 11

CCG rates, da/dt, against C* for the CT specimens

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Fig. 12

Minimum creep strain rates against stress

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Fig. 13

Calculated creep rupture stresses for specified failure times at 675 °C

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