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- W240702926 abstract "This paper describes the effects produced by new heattreating techniques currently employed on heavy-section pressure-vessel steels to improve their low- temperature properties. Conventiond normalizing treatments produce inferior notch toughness in plates of 2--4 in. and over because of the retarded cooling rate. Micro-structurally, this results in excessive ferrite grain and pearlite aggregate size in plan-carbon steels and increased amounts of higher-temperature transformation products in low-alloy high-strength steels. This problem is minmized by the use of liquid quenching. Quenching, in turn, produces a problem of variable cooling rate, mcrostructure and properties through the thickness of the plate. Plates of seven lowalloy steels and two carbon steels were heat treated to reproduce the cooling rates at the surface and center of water-sprayed and of normalized 4-in. plate. It was found possible to improve the strength and particularly the notch toughness of the alloy steels by accelerated cooling, provided only that stress relieving followed the treatment. (auth)" @default.
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- W240702926 date "1958-04-01" @default.
- W240702926 modified "2023-09-26" @default.
- W240702926 title "EFFECT OF HEAT TREATMENT ON THE MICROSTRUCTURE AND LOW-TEMPERATURE PROPERTIES OF PRESSURE-VESSEL STEELS" @default.
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