Jia-hua Liu, Lei Wang, Yang Liu, Xiu Song, Jiong Luo, and Dan Yuan, Fracture toughness and fracture behavior of SA508-III steel at different temperatures, Int. J. Miner. Metall. Mater., 21(2014), No. 12, pp. 1187-1195. https://doi.org/10.1007/s12613-014-1026-2
Cite this article as:
Jia-hua Liu, Lei Wang, Yang Liu, Xiu Song, Jiong Luo, and Dan Yuan, Fracture toughness and fracture behavior of SA508-III steel at different temperatures, Int. J. Miner. Metall. Mater., 21(2014), No. 12, pp. 1187-1195. https://doi.org/10.1007/s12613-014-1026-2
Jia-hua Liu, Lei Wang, Yang Liu, Xiu Song, Jiong Luo, and Dan Yuan, Fracture toughness and fracture behavior of SA508-III steel at different temperatures, Int. J. Miner. Metall. Mater., 21(2014), No. 12, pp. 1187-1195. https://doi.org/10.1007/s12613-014-1026-2
Citation:
Jia-hua Liu, Lei Wang, Yang Liu, Xiu Song, Jiong Luo, and Dan Yuan, Fracture toughness and fracture behavior of SA508-III steel at different temperatures, Int. J. Miner. Metall. Mater., 21(2014), No. 12, pp. 1187-1195. https://doi.org/10.1007/s12613-014-1026-2
The fracture toughness of SA508-III steel was studied in the temperature range from room temperature to 320°C using the J-integral method. The fracture behavior of the steel was also investigated. It was found that the conditional fracture toughness (JQ) of the steel first decreased and then increased with increasing test temperature. The maximum and minimum values of JQ were 517.4 kJ/m2 at 25°C and 304.5 kJ/m2 at 180°C, respectively. Dynamic strain aging (DSA) was also observed to occur when the temperature exceeded 260°C with a certain strain rate. Both the dislocation density and the number of small dislocation cells effectively increased because of the occurrence of DSA; as a consequence, crack propagation was more strongly inhibited in the steel. Simultaneously, an increasing number of fine carbides precipitated under high stress at temperatures greater than 260°C. Thus, the deformation resistance of the steel was improved and the JQ was enhanced.
The fracture toughness of SA508-III steel was studied in the temperature range from room temperature to 320°C using the J-integral method. The fracture behavior of the steel was also investigated. It was found that the conditional fracture toughness (JQ) of the steel first decreased and then increased with increasing test temperature. The maximum and minimum values of JQ were 517.4 kJ/m2 at 25°C and 304.5 kJ/m2 at 180°C, respectively. Dynamic strain aging (DSA) was also observed to occur when the temperature exceeded 260°C with a certain strain rate. Both the dislocation density and the number of small dislocation cells effectively increased because of the occurrence of DSA; as a consequence, crack propagation was more strongly inhibited in the steel. Simultaneously, an increasing number of fine carbides precipitated under high stress at temperatures greater than 260°C. Thus, the deformation resistance of the steel was improved and the JQ was enhanced.
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