Carbide precipitation by Heating High-Manganese Steel after Solution Treatment

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Carbide precipitations in isothermally and continuously heated Hadfield steel after solution-treatment were studied. Results obtained were as follows : 1. Solution-treated steel precipitated primary carbide isothermally in accordance with C-curve which has the nose at about 650〜700℃, and also precipitated secondary pearlitic constituent isothermally with C-curve which has the nose at about 600℃. 2. At the primary stage, carbide films were formed at austenitic grain boundaries. In the low temperature range, carbide film formation delayed markedly, and then, platelet carbide were formed along the cleavage plane of grains. In the high temperature range, carbide films changed into granular particles and gradually took coherent shapes. 3. The nucleations of pearlitic constituents were most rapid at about 600℃, but growing velocity of pearlite has maximum value at about 500℃. 4. Secondary precipitates, pearlitic constituents, were very fine lamellar pearlite, and the lower temperature precipitates has the finer lamellar structure than precipitates at higher temperature. 5. In continuous heating, steel precipitated boundary carbides, platelet carbides and pearlitic constituents at about 500-600℃. It suggested that no pearlite precipitated when heated at a rate of above about 15℃/min and also no carbide precipitated when heated at a rate of above about 45℃/min. 6. Mechanical properties were injured by heating above about 350℃, since platelet carbide precipitations began at that temperature. Tensile strength lowered to minimum value at 750℃, since carbide films markedly grew at that temperature, and impact value, elongation and reduction of area lowered to minimum value at pearlite precipitation range. Increased hardness was affected mainly by platelet carbide precipitations
東北大学の論文

Carbide precipitation by Heating High-Manganese Steel after Solution Treatment

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