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<p>In the normal operation of steel hot rolling, the roll is generally consumed by wear. When problems such as an accident occur during rolling operation, a mechanical or thermal crack is generated and propagates, later developing in major damage and loss. In this study, the fracture toughness and crack propagation characteristics of hot work roll materials were investigated in alloy cast steel (CS), adamite (AD), indefinite chilled cast iron (IC), chromium cast iron with graphite (GCR), high chromium cast iron (HCR), and multi-component white cast iron (HSS), from a fracture mechanics perspective using Compact Tension (CT) and Chevron Notch Tensile (COD) tests. The test specimens were prepared using material extracted from the used rolls. The results revealed that the presence of eutectic carbides in the materials decreased the fracture toughness. The Paris-Erdogan equation, da/dN=C(ΔK<sub>I</sub>)<sup>m</sup>, was found to express the relationship between crack propagation rate (da/dN) and stress intensity factor range (ΔK<sub>I</sub>), with the constants C and m related by C=(1.88×10<sup>-5</sup>)(10.6<sup>-m</sup>). By comparing the parameter m, the crack propagation rate of each material was analyzed. The constant m had a large value in the materials containing carbon content over 2 mass% where the eutectic carbides crystallized, and the m value increased with rising hardness. The da/dN of cast materials increased in the ranked order of CS, AD, GCR, IC, HCR and HSS materials.</p>

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Characteristics of Fracture Mechanics in Cast Roll Materials for Steel Hot Rolling

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Jatupon Opapaiboon,
  • Sudsakorn Inthidech,
  • Ken-ichi Ozaki,
  • Mitsuo Hashimoto,
  • Yasuhiro Matsubara

摘要

In the normal operation of steel hot rolling, the roll is generally consumed by wear. When problems such as an accident occur during rolling operation, a mechanical or thermal crack is generated and propagates, later developing in major damage and loss. In this study, the fracture toughness and crack propagation characteristics of hot work roll materials were investigated in alloy cast steel (CS), adamite (AD), indefinite chilled cast iron (IC), chromium cast iron with graphite (GCR), high chromium cast iron (HCR), and multi-component white cast iron (HSS), from a fracture mechanics perspective using Compact Tension (CT) and Chevron Notch Tensile (COD) tests. The test specimens were prepared using material extracted from the used rolls. The results revealed that the presence of eutectic carbides in the materials decreased the fracture toughness. The Paris-Erdogan equation, da/dN=C(ΔKI)m, was found to express the relationship between crack propagation rate (da/dN) and stress intensity factor range (ΔKI), with the constants C and m related by C=(1.88×10-5)(10.6-m). By comparing the parameter m, the crack propagation rate of each material was analyzed. The constant m had a large value in the materials containing carbon content over 2 mass% where the eutectic carbides crystallized, and the m value increased with rising hardness. The da/dN of cast materials increased in the ranked order of CS, AD, GCR, IC, HCR and HSS materials.