Role of phase transformations in residual stress development in multipass ferritic steel welds and Gleeble test bars
- Oak Ridge National Lab., TN (United States)
Neutron strain scanning has proven very effective in non-destructive mapping of the distribution of residual stresses in weldments. Strain scanning of Gleeble test bars of 2 1/4 Cr-1 Mo steel has been carried out in conjunction with strain scanning investigations of a multipass weld in 0.5-in. plate of the same alloy. The residual stresses in the Cleeble bars depend on the time spent at the maximum temperature and the rate of cooling. The longitudinal strains on the Gleeble bar center-line are tensile with a maximum on either side of the central hot zone. The transverse strains are compressive but vary with thermal treatment to a higher degree than variations in the longitudinal strains. The difference between strains at the center-line and off the center-line can be significantly greater than statistical error in aircooled Gleeble bars. The strains in the Gleeble bar have a high tensile component parallel to the direction of maximum heat transfer (viz. along the bar axis). By contrast, the large tensile strains in the heat-affected zone (HAZ) of the weldment are along the weld line which is essentially perpendicular to the direction of maximum heat transfer. The simulated conditions present in Gleeble bar test specimens are different from that observed in weld HAZ.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 207054
- Report Number(s):
- CONF-950682-16; ON: DE96005553
- Resource Relation:
- Conference: 4. international conference on trends in welding research, Gatlinburg, TN (United States), 5-9 Jun 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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