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<p>This study examines the effects of different heat treatments (furnace cooling (FC), air cooling (AC), and water cooling (WC) after austenitization) on the interfacial state and microstructure of 316L/Q420qENH clad steel (CSL), with a focus on their tensile fracture behavior, low-cycle fatigue (LCF) performance, and damage mechanisms. Interfacial delamination in tensile specimens is induced by shear stress generated from the deformation incompatibility between the weathering steel and stainless steel grains. High-density interfacial substructures can suppress this behavior, thereby enhancing tensile performance. As a result, when the interfacial strength (Rp0.2) ≥ 1687.7 MPa and the Vickers hardness difference between the two sides ≤ 37.6 HV, CSL can achieve relatively compatible tensile deformation. Under fatigue loading, deformation first accumulates around carbon-rich microstructures, causing fatigue cracks to always initiate on the weathering steel side. The stainless steel cladding markedly improves fatigue life. On the weathering steel side, slip is hindered by carbon-rich phases (Pearlite, M/A constituents, lath bainite), and when the dislocation density is high, deformation twins and dislocation cells are formed. With the continuous accumulation of slip, lath bainite gradually fragments, forming fatigue striations in the crack propagation zone.</p>

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The synergistic effects of interface substructure and microstructure regulation on the tensile and LCF behavior of 316L/Q420qENH clad steel plate

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Yinpeng Wang,
  • Bo Gao,
  • Lu Zhu,
  • Chunhui Jiang,
  • Guangjie Da,
  • Tongyu Fu,
  • Yanguang Cao,
  • Wei Wei,
  • Zhaodong Li

摘要

This study examines the effects of different heat treatments (furnace cooling (FC), air cooling (AC), and water cooling (WC) after austenitization) on the interfacial state and microstructure of 316L/Q420qENH clad steel (CSL), with a focus on their tensile fracture behavior, low-cycle fatigue (LCF) performance, and damage mechanisms. Interfacial delamination in tensile specimens is induced by shear stress generated from the deformation incompatibility between the weathering steel and stainless steel grains. High-density interfacial substructures can suppress this behavior, thereby enhancing tensile performance. As a result, when the interfacial strength (Rp0.2) ≥ 1687.7 MPa and the Vickers hardness difference between the two sides ≤ 37.6 HV, CSL can achieve relatively compatible tensile deformation. Under fatigue loading, deformation first accumulates around carbon-rich microstructures, causing fatigue cracks to always initiate on the weathering steel side. The stainless steel cladding markedly improves fatigue life. On the weathering steel side, slip is hindered by carbon-rich phases (Pearlite, M/A constituents, lath bainite), and when the dislocation density is high, deformation twins and dislocation cells are formed. With the continuous accumulation of slip, lath bainite gradually fragments, forming fatigue striations in the crack propagation zone.