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- W40413723 abstract "Microstructure and properties have been studied for high-strength steel weld metals with variations in carbon, manganese, and nickel. Based on neural network modeling, experimental welds were made using shielded metal arc welding with manganese at 0.5 or 2.0 wt-% and nickel at 7 or 9 wt-%. Additional welds were made where carbon was varied between 0.03 and 0.11 wt-%. Generally there was very good agreement between the recorded mechanical properties and the neural network predictions. A combination of high nickel and manganese was positive for strength but very negative for impact toughness, while manganese reductions lead to large impact toughness increases. Carbon additions up to 0.11 wt-% were found to increase yield strength to over 900 MPa while still maintaining toughness at over 60 J at -100°C. Mechanical properties of the weld metals could be rationalized in terms of their relative amounts of the different microstructural constituents. Martensite provided the highest strength and reasonable toughness. Upper and lower bainite contributed to very good toughness and high strength. The least beneficial properties were found in the high-manganese variants due to a combination of primarily coarse-grained coalesced bainite and martensite. This combination of microstructural constituents resulted in poor toughness, relatively high yield strength, and the highest tensile strength. Furthermore, increasing contents of manganese and nickel resulted in a significant lowering of Ac 1 , thereby contributing to poorer impact toughness as a consequence of less tempering in reheated regions. The optimal combination of strength and impact toughness were found at 0.5 manganese and 7 nickel with intermediate carbon levels, resulting in an easily tempered, fine scale mixture of upper and lower bainite together with some martensite." @default.
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- W40413723 date "2006-01-01" @default.
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- W40413723 title "New developments with C-Mn-Ni high strength steel weld metalsPart B, Mechanical properties" @default.
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