Abstract
AbstractIn heavy steel castings, especially high-strength quenched and tempered castings, inter granular brittleness presents a major problem. Earlier investigations have shown this to depend on the precipitation of a thin brittle phase in the primary grain boundaries. If the embrittling phase is A1N, three variables will control the precipitation; aluminium content of the steel, nitrogen content, and cooling rate. Slow cooling rates and large alloy contents promote precipitation. The paper shows how to calculate the thickness of the precipitate on continuous cooling and thus to assess the risk of intergranular fracture. Two solutions are presented, an approximate one based on the computed TTT diagram, and a more exact model in which the precipitation rate is integrated over the temperature range. The two solutions give reasonably similar results, thus proving the value of isothermal diagrams even in the case of continuous cooling.
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