Correlation of microstructure with mechanical properties of 300m steel

Metallurgical Transactions A - 1977
Youngblood, J. L.1, Raghavan, M.2
1Gemini Detectors, Inc., Houston
2Olin-Corporation, Metals Research Laboratories, New Haven

Tóm tắt

300M steel was subjected to a wide range of quenched and tempered heat treatments. The plane-strain fracture toughness and the tensile ultimate and yield strengths were evaluated. Results indicate that substantial improvement in toughness with no loss in strength can be accomplished in quenched and tempered steel by austenitizing at 1255 K (1800°F) or higher. Low fracture toughness in conventionally austenitized 300M steel (1144 K (1600°F)) appears to be caused by undissolved precipitates seen both in the submicrostructure and on the fracture surface which promote failure by quasi-cleavage. These precipitates appeared to dissolve in the range 1200 to 1255 K (1700 to 1800°F).

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Metallurgical Transactions A

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