オーステンパ球状黒鉛鋳鉄の靭性に及ぼすサブゼロ処理の効果 [in Japanese] Effects of Subzero Treatment on Toughness of Austempered Ductile Cast Iron [in Japanese]
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The tensile strength and the toughness of austempered ductile cast iron with or without subzero treatment and quench tempered ductile cast iron were investigated. The following results were obtained : (1) The quantity of retained austenite of the cast iron austempered at 623∼773 K are 30∼40 %, and are decreased to 15∼25 % by subzero treatment after austempering. (2) The elongation and Charpy impact values of the cast iron austempered at 573∼773 K without subzero treatment after austempering are higher than that of the other heat treated specimens with the same tensile strength. (3) The retained austenite decreases after the tensile test remarkably. On the other hand, the change of the quantity of retained austenite is little after the bending and the impact test. (4) In the subzero treated cast iron after austempering, the retained austenite is divided into small sections by deformation induced martensitic transformation.
- THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY
THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY 70(4), 241-246, 1998-04
Japan Foundry Engineering Society