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<p>Clad plates are favored by many companies and experts for their superior comprehensive performance. The traditional composite process takes the rolled sheet as a starting point; the deformation energy and deformation time are insufficient due to the limitation of the rolling pass. Thus, the bonding strength is not ideal, and the microstructure property gradient is large. The new generation thermomechanical control process (NG-TMCP) can regulate the properties of the plate. Based on this, a short rolling process is introduced by moving forward the rolling composite starting point, which produces high-performance clad plates from low-performance cast billets. In this paper, the NM400/Q345 clad plates were fabricated by short rolling. The properties and microstructure were investigated at reduction ratios of 45%, 60%, and 70%. Results show that the tensile strength and elongation after fracture are not inferior to the Q345 and NM400 of the same specification. The bonding strength increased with the increase of the reduction ratio. The interface becomes clearer and flatter. The elongation after fracture increased first but then decreased. Fine equiaxed grains obtained by recrystallization are elongated along the rolling direction at the reduction ratio of 70%. Interfacial oxide is broken into fine particles and distributed evenly.</p>

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The Mechanical Properties and Microstructure Evolution of NM400/Q345 Clad Plates Prepared by the NG-TMCP

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Jia-Hui Fang,
  • Yan-Bing Lv,
  • Rong-Jun Wang,
  • Lian-Yun Jiang,
  • He-Xin Cheng,
  • Zhi-Quan Huang

摘要

Clad plates are favored by many companies and experts for their superior comprehensive performance. The traditional composite process takes the rolled sheet as a starting point; the deformation energy and deformation time are insufficient due to the limitation of the rolling pass. Thus, the bonding strength is not ideal, and the microstructure property gradient is large. The new generation thermomechanical control process (NG-TMCP) can regulate the properties of the plate. Based on this, a short rolling process is introduced by moving forward the rolling composite starting point, which produces high-performance clad plates from low-performance cast billets. In this paper, the NM400/Q345 clad plates were fabricated by short rolling. The properties and microstructure were investigated at reduction ratios of 45%, 60%, and 70%. Results show that the tensile strength and elongation after fracture are not inferior to the Q345 and NM400 of the same specification. The bonding strength increased with the increase of the reduction ratio. The interface becomes clearer and flatter. The elongation after fracture increased first but then decreased. Fine equiaxed grains obtained by recrystallization are elongated along the rolling direction at the reduction ratio of 70%. Interfacial oxide is broken into fine particles and distributed evenly.