0
TECHNICAL PAPERS

Influence of Extra Coarse Grains on the Creep Properties of 9 Percent CrMoV (P91) Steel Weldment

[+] Author and Article Information
Rui Wu, Facredin Seitisleam

Swedish Institute for Metals Research, Drottning Kristinas väg 48, S-114 28 Stockholm, Sweden

Rolf Sandström

Materials Science and Engineering, KTH, Brinellvägen 23, S-100 44 Stockholm, SwedenSwedish Institute for Metals Research, Drottning Kristinas väg 48, S-114 28 Stockholm, Sweden

J. Eng. Mater. Technol 126(1), 87-94 (Jan 22, 2004) (8 pages) doi:10.1115/1.1631025 History: Received March 01, 2003; Revised June 03, 2003; Online January 22, 2004
Copyright © 2004 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
LOM micrograph of a cross section of the welded pipe. Hardness profiles in the middle of the weld metal as well as across the weldment at 4.5 mm respectively 14.5 mm below the outer surface are schematically marked. Ruler scale showing 1 mm interval is given below the micrograph.
Grahic Jump Location
LOM micrograph showing microstructures across the weldment of the welded pipe (a)–(d) and the simulated HAZ microstructures (e)–(f ). (a) the weld metal (to the left) and the coarse grained HAZ (to the right) adjacent to the fusion line (indicated by the arrows) near the outer surface, 25X. (b) the coarse grained HAZ, 400X. (c) the intercritical HAZ, 100X. (d) the intercritical HAZ (to the left) and the parent metal (to the right), 100X. (e) the simulated coarse grained HAZ at 1300°C, 100X. (f ) the simulated intercritical HAZ at 850°C, 100X.
Grahic Jump Location
Hardness profiles in the welded pipe, (a) in the middle of weld metal through the thickness, and (b) across the weldment at 4.5 mm and 14.5 mm below the outer surface. FB refers to the fusion boundary, WM the weld metal, CGHAZ the coarse grained HAZ, ICHAZ the intercritical HAZ, and PM the parent metal.
Grahic Jump Location
Hardness and grain size versus austenitizing temperature. Hardness and grain size from the as-received material and from the coarse grained HAZ (CGHAZ) of the welded pipe are included for comparison.
Grahic Jump Location
Log stress σ as a function of log rupture time tR for the given series. Regressions by Eq. (1), shown by lines, are included.
Grahic Jump Location
Log elongation at rupture εR as a function of log rupture time tR for the given series
Grahic Jump Location
Minimum creep rate ε̇min as a function of log stress σ for the given series. Regressions by Eq. (2), shown by lines, are included.
Grahic Jump Location
True creep strain rate as a function of true creep strain for the parent metal at stresses in the interval 110 to 180 MPa. Model values using Eqs. (4) to (6) are included in the figure.
Grahic Jump Location
True creep strain rate as a function of true creep strain for the simulated intercritical HAZ at stresses in the interval 110 to 180 MPa. Model values using Eqs. (4) to (6) are included in the figure.
Grahic Jump Location
LOM micrograph from the simulated coarse grained HAZ. Intergranular failure occurred after tR=7362 hours and εU=3.2 percent at 180 MPa. Perpendicular to the stress direction, microcracks developed intergranularly adjacent to fracture. Cavities formed at the grain boundary in front of the microcracks, indicated by arrows. 100X.
Grahic Jump Location
LOM micrograph from the cross weld. Transgranular failure in the intercritical HAZ occurred after tR=5630 hours and εU=1.3 percent at 90 MPa. Microcrack and cavities, shown by arrows, in the unfailed intercritical HAZ. 50X.
Grahic Jump Location
Comparison of cross weld creep strength at 600°C between the present and other published results

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In