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| Investigation on Hot Deformation Behavior of Secondary Hardening Ultra-high Strength Steel |
| Yong LI Chun-xu WANG Xian-min LIU |
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Abstract The hot compression deformation behaviors of secondary hardening ultra-high strength AF1410 steel with high strength and toughness has been investigated by use of Gleeble-3500 simulator at the temperature rang of 1123K to 1423K and at the strain rate of 0.5~10s-1. The corresponding flow curves have been determined and hot deformed microstructures were observed. The results show that the flow stress and peak strain increase with increasing strain rate or decreasing deformation temperature. At true strain 0.8 and the strain rate of 0.5~10s-1, the temperature of full dynamic recrystallization increase with the strain rate rising. When the strain rate is 10s-1 the deformation temperature is beyond 1373K full dynamic recrystallization occurred. The hot deformation activation energy Q of AF1410 steel is 430.39kJ/mol and the hot deformation equation is derived based on the experiments.
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Received: 23 July 2008
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2009, Vol. 1 