Microstructure and tensile properties of 2 1/4 Cr-1 Mo steel weldments with varying carbon contents
Welded test specimens of 2/sup 1///sub 4/ Cr-1 Mo steel were made by joining /sup 1///sub 2/ in. thick plates by the gas tungsten-arc process. Microstructure, macrostructure, room temperature hardness, and tensile properties were determined on weld metal, transverse weld specimens and normalized-and-tempered base metal for three laboratory heats of 2/sup 1///sub 4/ Cr-1 Mo steel with 0.003, 0.035, and 0.11 percent C. Welds were made with and without preheat, and the effect of postweld heat treatment was investigated. The multipass welding process led to variations in structure and hardness across the weldments. These differences were equalized by a post-weld heat treatment. The microstructures, which consisted of bainite and proeutectoid ferrite, were determined by the carbon content: the higher the carbon content, the greater the amount of bainite present in the structure. Tensile tests on weld metal at 25 and 565/sup 0/C showed that the strength was determined by the carbon content, with the steel with the highest carbon content being the strongest. For the transverse weld specimens and base metal, the 0.11 percent C steel was always strongest, and at 25/sup 0/C, the strength of the 0.035 percent C steel was greater than that of the 0.0003 percent C steel. At 565/sup 0/C, however, there was little difference between the 0.035 and 0.003 percent C steels. All transverse weld specimens failed in the base metal.
- Research Organization:
- Oak Ridge National Lab., TN
- OSTI ID:
- 7140116
- Journal Information:
- Weld. J. (Miami); (United States), Vol. 55:9
- Country of Publication:
- United States
- Language:
- English
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