Abstract
The influence of Al contents (0.035, 0.5, and 0.8%) on hot ductility of high-strength steel was studied by experimental hot tensile tests in the temperature range of 600–1300 °C and under the strain rate of 0.001 s−1 by a Gleeble-1500 thermal simulation machine. According to the tensile results, the true stress–strain curve was obtained and the reduction of area was calculated. The results showed that when the Al content was 0.035%, the reduction of area of steel was less than 40% at 600, 700, 750, and 850 °C, and when the Al content was 0.5%, the reduction of area was less than 40% at 600–1000 °C and more than 40% at 1000–1300 °C; when the Al content was 0.8%, the reduction of area was less than 40% at 650–1050 °C. Overall, the hot ductility was the worst when the Al content was 0.5%. In addition, the fracture morphology of the samples was observed by the scanning electron microscope.KeywordsHot deformationMicrostructural evolutionHigh-strength steel
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