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| IMPACT FRACTURE BEHAVIOUR OF 09MnNb STEEL AT LOW TEMPERATURES |
| by CAI Tikang; LI Peiliang; JIANG Jingkai (Baotou Institute of Metallurgy) (Manuscript received 10 January; 1981; revised manuscript 4 December; 1982) |
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Cite this article:
by CAI Tikang; LI Peiliang; JIANG Jingkai (Baotou Institute of Metallurgy) (Manuscript received 10 January; 1981; revised manuscript 4 December; 1982). IMPACT FRACTURE BEHAVIOUR OF 09MnNb STEEL AT LOW TEMPERATURES. Acta Metall Sin, 1983, 19(4): 88-152.
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Abstract The low-temperature impact fracture of controlled-rolled and normalized steel 09MnNb has been investigated. Data on the load-flexibilty plot after impact test at various temperatures show that the steel either controlled-rolled or normalized offers higher resistance to tearing. The fracture occurred below the ductilebrittle transition temperature is by cleavage with dimpled rupture. The controlledrolled steel has a mixed α-grain structure which consists of equiaxial α-grains and "cold-worked" elongated grains with higher dislocation density, while the normalized steel has finer equiaxial α-grains with cell substructure of dislocation, of which the effective size of a-grain may be reduced. This microstructure of normalized steel makes the improved low-temperature impact property possible.
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Received: 18 April 1983
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1 沈如璋;沈彼德;林有祚;王家禄;向德渊;叶崇发;李述创;栾凤英,钢铁,16(1981) ,№ 8,26．
2 Heslop, J.; Petch, N. J., Philos. Mag., 3 (1958) , 1128．
3 Tanaka, T., Int. Met. Rev., 26 (1981) , 185．z |
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