Aptness of predictive equations for arctic steel heat affected zone properties
- SINTEF Metallurgy, Trondheim (Norway)
- Amoco Corporation Research, Naperville, IL (United States)
- Colorado School of Mines, Golden, CO (United States). Center for Welding and Joining Research
Use of predictive equations to determine the minimum preheat and heat input required for a specific steel in arctic fabrication and repair welding has considerable cost reducing potential. In the present investigation, the aptness of an empirical predictive expression was evaluated for a group of advanced arctic steels covering a broad range in chemical composition. In addition, new sets of empirical predictive equations were developed based on multiple-regression analysis of experimental data. The experimental procedure involved resistance heating of cylindrical specimens in a computer controlled weld thermal simulator to a peak temperature of approximately 1,350 C. A broad range of thermal experiences were simulated by systematic variations in the cooling time from 800--500 C, {Delta}t{sub 8/5}. The hardness values were measured across the specimen diameter. When all experimental data were examined together, independent of thermal experience and steel composition, good correlation existed between predicted and measured hardness values for the medium heat input welds, i.e., 10s < {Delta}t{sub 8/5} < 40s, which include most industrial welding processes. The hardness readings of high and low heat input welds deviated considerably from the predicted values. However, the new expressions developed for each individual thermal experience showed an excellent correlation. On this basis they conclude, that at present, no single equation, accounting for both the thermal experience and the steel chemical composition to predict the hardness level in the coarse grained heat affected zone, apply to the type of steels examined in this study. Consequently, a more fundamental understanding of the factors controlling the microstructural development in the heat affected zone is required. This knowledge will, in turn, form the basis needed for a more fundamental development of predictive equations for general use.
- OSTI ID:
- 33185
- Report Number(s):
- CONF-930641-; ISBN 0-7918-0785-1; TRN: IM9518%%6
- Resource Relation:
- Conference: OMAE `93: 12th international conference on offshore mechanics and arctic engineering, Glasgow (United Kingdom), 20-24 Jun 1993; Other Information: PBD: 1993; Related Information: Is Part Of OMAE 1993: Volume 3, Part A -- Materials engineering; Salama, M.M.; Toyoda, Masao; Liu, S.; Dos Santos, J.F.; Kocak, M.; Williams, J. [eds.]; PB: 434 p.
- Country of Publication:
- United States
- Language:
- English
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