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<p>In this research, continuous IN718 swarf was used as reinforcement for GG25 gray cast iron. Swarf was directionally placed inside the foam model, and cast iron was cast via the lost foam method. The presence of machining swarfs resulted in a transition of graphite distribution from type VII A CLAS 4 to type VII A CLAS 5 VIIE. Upon normalizing at 900°, simple samples of type VII A CLAS6 graphite were observed, whereas the normalized composite samples included VII A CLAS6 VIIB and VIIE graphites. The incorporation of swarf and the diffusion of elements including chromium, nickel, and molybdenum facilitated the development of unique phosphide eutectic phases, carbide, and allotriomorphic ferrite. Moreover, pearlite matrix layers were present in GCI, normalized GCI, composite, and normalized composite samples, with measurements of 0.543, 0.392, 0.45, and 0.301&#xa0;µm. The interaction between the swarf and the melt, along with the transfer of alloy elements between the cast iron matrix and the swarf, produced a transitional interface that varied in width from 220 to 388&#xa0;µm as a result of normalization. Furthermore, the addition of the swarfs enhances the hardness and fracture energy of the composite, resulting in values of 211&#xa0;HB and 7.8&#xa0;joules, respectively. Upon normalization, these values rise to 244&#xa0;HB and 10.2 joules. The interface microhardness of composite samples reaches 430-463 HV with normalization.</p>

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The Influence of IN718 Superalloy Swarf on the Toughness and Fracture Mechanics of GG25 Gray Cast Iron

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Mehdi Ranjbar,
  • Seyed Hossein Razavi,
  • Zahra-Sadat Seyedraoufi,
  • Yazdan Shajari

摘要

In this research, continuous IN718 swarf was used as reinforcement for GG25 gray cast iron. Swarf was directionally placed inside the foam model, and cast iron was cast via the lost foam method. The presence of machining swarfs resulted in a transition of graphite distribution from type VII A CLAS 4 to type VII A CLAS 5 VIIE. Upon normalizing at 900°, simple samples of type VII A CLAS6 graphite were observed, whereas the normalized composite samples included VII A CLAS6 VIIB and VIIE graphites. The incorporation of swarf and the diffusion of elements including chromium, nickel, and molybdenum facilitated the development of unique phosphide eutectic phases, carbide, and allotriomorphic ferrite. Moreover, pearlite matrix layers were present in GCI, normalized GCI, composite, and normalized composite samples, with measurements of 0.543, 0.392, 0.45, and 0.301 µm. The interaction between the swarf and the melt, along with the transfer of alloy elements between the cast iron matrix and the swarf, produced a transitional interface that varied in width from 220 to 388 µm as a result of normalization. Furthermore, the addition of the swarfs enhances the hardness and fracture energy of the composite, resulting in values of 211 HB and 7.8 joules, respectively. Upon normalization, these values rise to 244 HB and 10.2 joules. The interface microhardness of composite samples reaches 430-463 HV with normalization.