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| Plastic low stress and physically based constitutive model of four newer naval vessel steels |
| WeiGuo Guo |
| 西安市;西北工业大学 |
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Cite this article:
WeiGuo Guo. Plastic low stress and physically based constitutive model of four newer naval vessel steels. Acta Metall Sin, 2006, 42(5): 463-468 .
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Abstract In the present paper, mechanical behavior of HSLA-65, DH-36, AL-6XN and Nitronic-50 is systematically studied. Strains over about 40% are achieved in these tests over a temperature range of 77-1,000K and strain rates of 0.001 to 8,000/s. The results show that, 1) Plastic flow stress of the four newer steelsis is sensitive to the temperature and strain rate, flow stress decreases with decreasing temperatures and increasing strain rates; 2) With increasing or changing plastic strain, the temperature history remarkably affects the microstructure; 3) Dynamic strain aging occurs at lower strain rates and higher temperatures. With increasing strain rates, the stress peak of dynamic strain aging will shift to higher temperature region, or even disappear in the present strain rate range. Taking into account all these phenomena, based on the mechanism of dislocation motion, including the effect of viscous drag on the motion of dislocations, the physically-based model is shown, but excluding the dynamic strain aging effects, The parameters of this model contain the physical concept. Finally, the results of model is discussed. The model predictions are compared with the results of the experiments in a wide range of temperatures and strain rates, but excluding plastic flow stresses in dynamic strain aging region.
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Received: 18 August 2005
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