14. New Impact Test and Arrestability of High-toughness 9% Ni Steel

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Recent steel manufacturing produces 9% Ni steels with high toughness through minimizing impurities in steel and improving heat treatment. These 9% Ni steels show ductile fracture and absorbed energy more than 20 kgf min V-Charpy impact test at -196℃, which indicates V-Charpy impact test to be insufficient for the material selection. It is difficult to know the arrestability of these 9% Ni steels through the "surface-notched double tension test" using liquid nitrogen (-196℃) as refrigerant, though the method has been developed to get the arrestability for high-toughness materials. In this paper the crack arrestability of 9% Ni steels which were varied in toughness was examined by means of surface-notched double tension tests and Charpy impact tests of two specimen types. The former were conducted to check Kca values and the latter were conducted at temperatures ranging -100〜-269℃ in order to clarify the effect of specimen notch shape on the ductile/brittle transition phenomenon of the high-toughness 9% Ni steels and crack initiation/propagation energy. The following conclusions are obtained. (1) "Three surface slitted Charpy impact test" is available for the material selection of high-toughness 9% Ni steels because their transition temperature shifts 45〜84℃ higher than that of V-notched one. (2) The crack arrestability of 9% Ni steels can be estimated based on the transition temperature and the propergation energy of three surface slitted Charpy impact test.
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14. New Impact Test and Arrestability of High-toughness 9% Ni Steel

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