Microstructural Features Controlling Ductile-to-Brittle Transition Behavior in High-Strength, Martensitic Steel Weld Metals
DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT
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An investigation of the transition behavior of high strength steel, martensitic weld metals was conducted. The objective of the investigation was to identify the specific microstructural features that control ductile-brittle transition in these weld metals. The approach systematically combined experimental measurements and observations with the use of analytical expressions. Charpy V-notch CVN properties, tensile properties, and cleavage fracture stress sigma c were generated over a range of temperatures. The critical tensile stress criterion CTSC was applied in the form of a modified Griffith-Orowan expression. To establish the applicability of the CTSC to the transition regime, transition temperatures were predicted from sigma c measurements, and compared to measured CVN transition temperatures.
- Metallurgy and Metallography