Creep properties of PWC-11 base metal and weldments as affected by heat treatment
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Creep properties of PWC-11 base metal and weldments as affected by heat treatment

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Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

Subjects:

  • Metals -- Creep.,
  • Electron beam welding.

Book details:

Edition Notes

StatementR.H. Titran, T.J. Moore, and T.L. Grobstein.
SeriesNASA technical memorandum -- 88842
ContributionsMoore, Thomas J., Grobstein, Toni., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17099193M

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Creep property of Nb-1ZrC (PWC) alloy showed the better result for electron beam welds as compared to base metal for the two conditions of heat treatment, i.e., annealing and ageing. The creep rupture test was conducted at the temperature of : Santosh Kumar Gupta, Sanjib Jaypuria, Dilip Kumar Pratihar, Partha Saha. The filler metals varied in creep strength level, so that one overmatched, one undermatched, and one matched the creep strength of the P grade pipe base material. The long-term objective of this work was to study the influence of weld metal creep strength on the overall creep behavior of the welded joints and their failure mechanism. A soft zone in Cr-Mo steel weldments has been reported to accompany the infamous Type IV cracking, the highly localized creep damage in the heat-affected zone of creep-resistant steels. A hr, K aging treatment prior to creep testing had a severe detrimental effect on creep strength of the base metal and transverse electron beam weldments, reducing the time to attain 1.

The weld joints exhibited significantly lower creep rupture lives than the base metal at lower applied stresses. Creep rupture location of the weld joints was found to occur in the ICHAZ. The impact of welding on the creep properties of advanced 9–12% Cr steels and proper heat treatment by the base metal. notch location in distinct weld regions such as weld metal (WM. complex microstructures in weld metals and heat affected zones mean that the properties of the material change from the base metal into the weld [6]. Creep in welds is therefore more complex than creep in base metal and care has to be applied when the process is being modeled. The weld metal and HAZ are frequently referred as steel weldments. The welding processes, welding consumables, and welding parameters have also influence on these properties. Properties of steel weldments are also influenced by the corrosive atmospheres and cyclic loading to which they are frequently being subjected. Heat affected zone.

the creep strength of the weld joint and the basic material. The following relation is used for this purpose R /t/T R (w)/t/T WSF(t) u = u (2) where WSF(t) is weld strength factor, Ru(w)/t/T is creep strength of the weldment and Ru/t/T is creep strength of the base material at temperature T and time to rupture t. Creep performance of welded structures at high temperatures M Law, W Payten 2 weld metals, 3 HAZ material properties, 2 different HAZ widths and 4 different levels of imposed axial mismatch between the weld components creep properties, wide heat affected zones, or are assessed as being subject to high imposed axial. Alternatively, a Post Weld Heat Treatment (PWHT) may be specified to improve the properties of the weld and of the Heat Affected Zone (HAZ). Filler metals are generally similar in composition to the base Creep-resistant-steels, except if post weld heat treatment cannot be performed. In that case austenitic filler metals (not hardenable) may be. Weld on Publishing, Metals Handbook, Volume 4 – Heat Treating. 9th Edition. American Society for Metals, When determining whether or not to PWHT, the alloying system and previous heat treatment of the base metal must be considered Figure 2. Post heat .