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<p>The austenitized and double-tempered AISI H13 tool steel samples were subjected to glow discharge plasma nitriding to evaluate the mechanical properties and microstructure. Nanohardness, elastic modulus, yield strength, fracture morphology, and phase composition of austenitized and plasma nitriding H13 samples were assessed and compared with only austenitized H13 samples. The nanoindentation, stress–strain analysis, field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD) analysis tools were utilized. It was found that a thick diffusion layer without the formation of a compound layer having dominant martensite (α′-FeN) as well as γ-Fe is developed at 480⁰C after 6h of the processing cycle. The maximum hardness was obtained at the depth of 25µm, followed by an inverse relation with increasing depth due to the development of higher compressive residual stresses in the diffusion zone. This study enables us to select the best suitable temperature and cycle time required to slow down the formation and propagation of cracks in H13 steel used as aluminum extrusion dies after the plasma nitriding.</p>

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The Role of Plasma Nitriding on Pre-Austenitized AISI H13 Tool Steel Performance

  • 期刊论文

  • 发表日期：

    2025年1月15日

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  • Asaf Hanief Kohli,
  • Mohd Hanief,
  • Vishal Jagota

摘要

The austenitized and double-tempered AISI H13 tool steel samples were subjected to glow discharge plasma nitriding to evaluate the mechanical properties and microstructure. Nanohardness, elastic modulus, yield strength, fracture morphology, and phase composition of austenitized and plasma nitriding H13 samples were assessed and compared with only austenitized H13 samples. The nanoindentation, stress–strain analysis, field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD) analysis tools were utilized. It was found that a thick diffusion layer without the formation of a compound layer having dominant martensite (α′-FeN) as well as γ-Fe is developed at 480⁰C after 6h of the processing cycle. The maximum hardness was obtained at the depth of 25µm, followed by an inverse relation with increasing depth due to the development of higher compressive residual stresses in the diffusion zone. This study enables us to select the best suitable temperature and cycle time required to slow down the formation and propagation of cracks in H13 steel used as aluminum extrusion dies after the plasma nitriding.