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JI Bo, SHEN Yin-zhong, HUANG Xi. Serrated Flow of 11 Cr Ferritic/Martensitic Steel during High Temperature Tension[J]. Materials and Mechanical Engineering, 2014, 38(5): 33-36.
Citation: JI Bo, SHEN Yin-zhong, HUANG Xi. Serrated Flow of 11 Cr Ferritic/Martensitic Steel during High Temperature Tension[J]. Materials and Mechanical Engineering, 2014, 38(5): 33-36.
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Serrated Flow of 11 Cr Ferritic/Martensitic Steel during High Temperature Tension

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  • Received Date: March 02, 2014
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    • Abstract
  • Tensile test was performed on 11 Cr ferritic/martensitic steel at different temperatures (600-700 ℃) and strain rates of 2×10-5-1×10-3 s-1, and serrated flow during deformation was studied. The results show that "abnormal" serrated flow was found during tested steel deformation and only type E serrated wave exhibited. Serration behavior began to appear near the maximum tensile strength and serrated waves mainly lied in descending part of stress-strain curves. The effective activation energy for forming serration was 43.44 kJ·mol-1. At high temperature, the energy of substitutional atoms was high and could pin dislocations completely, and when a certain amount of dislocations up to a critical velocity and break free of pinning of substitutional atoms, the serrated flow appeared.
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