DYNAMIC FRACTURE TOUGHNESS OF ULTRASTRENGTH STEELS FOR AIRCRAFT

Abstract

Abstract: The plots of load vs deflection(P-D)for two ultra-strength steels 30CrMnSiNi2A and 300M has been examined on a Charpy impact tester with digital memory and microcomputer. A criterion was found to availably represent the dynamic fracture toughness,K_(Ic)~D ,of the steels under impact loading.The K_(Ic)~D,.can be calculated with suggesting that the turning point of change in compliance on the P-D plot is the point of destabilized crack propagation.The K_(Ic)~D of steel 300M,quenched at 870℃ ,separately tempered at 300℃ and 450℃,was esti- mated to be 55—70 MN/m~(3/2)and 54—67 MN/m~(3/2)respectively.The K_(Ic)calculated with accuracy about 20% seems to be available to the engineering evaluation.

Key words: ultra-strength steel, impact toughness, dynamic fracture toughness

XU Changgan ZENG Zhongping Beijing University of Aeronautics and Astronautics,Beijing,China. DYNAMIC FRACTURE TOUGHNESS OF ULTRASTRENGTH STEELS FOR AIRCRAFT[J]. Acta Metallurgica Sinica (English Letters), 1991, 4(3): 209-213.

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DYNAMIC FRACTURE TOUGHNESS OF ULTRASTRENGTH STEELS FOR AIRCRAFT

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