Strain aging and toughness characteristics of ferritic weld metals
The effects of varying nitrogen, titanium, boron, and aluminum contents on the as-deposited, stress-relieved, and artificially strain-aged shielded metal arc weld (SMAW) metal properties have been studied. There are still uncertainties concerning the exact role of each element and interactions between these elements with respect to the weld metal microstructure, strain aging and fracture properties. Therefore, systematic additions of titanium (in the range of 5 ppm to 500 ppm), boron (5 ppm to 200 ppm), aluminum (5 ppm to 560 ppm) and nitrogen were made to obtain various amounts of acicular ferrite and different microstructures which lead to the varying fracture behaviors and sensitivity to the strain aging. Increasing boron content also leads to an increase of the Charpy-V transition temperature with varying sensitivity to nitrogen content. Results indicate that as toughness of the as-deposited weld metal containing 40 ppm boron s much more sensitive to nitrogen content than the weld deposits contain 160 ppm boron. A similar trend has also been seen with the addition of 160 ppm aluminum to the weld metal while a change of titanium content did not cause such a significant change. In summary, present paper rigorously reviews the results of this extensive research program to develop a mechanistic understanding of the microalloying system (Ti, B and Al) on the strain aging and fracture toughness properties (Charpy-V and CTOD) of the multipass ferritic weldments.
- OSTI ID:
- 115485
- Report Number(s):
- CONF-9404233-; TRN: 95:002927-0063
- Resource Relation:
- Conference: 75. American Welding Society (AWS) annual meeting, Philadelphia, PA (United States), 10-15 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of 75th Diamond anniversary American Welding Society annual meeting; PB: 273 p.
- Country of Publication:
- United States
- Language:
- English
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