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<p>XH67MBTЮ (XH67) is a nickel-based superalloy used in the fabrication of complex-shaped components (such as gas ducts) of rocket engines for high-temperature applications. A gas duct is fabricated by long seam welding of two symmetrical halves, which were realized through hot forming. During hot-forming operation, cracking of material was noted in the lower half of gas duct. In order to understand the reasons for cracking, a detailed metallurgical investigation of the failed part was carried out. Further, Gleeble<sup>TM</sup> thermomechanical simulator has been employed to simulate the sequence of processes (thermal cycles and temperature drop) followed during hot forming, followed by tensile properties evaluation at varying temperatures. The simulated and tested specimens were subjected to microstructural and fractographic examination to understand the microstructural evolution during hot forming and nature of failure, respectively. The results obtained from simulated specimens were correlated with the results of specimens from failed part. Based on extensive metallurgical analysis, cracking of the material during hot forming was attributed to forming of material in the temperature range, having a dip in ductility. The results obtained from this study provided clear guidelines on the recommended range of temperature for successful hot forming of XH67 superalloy.</p>

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Process Simulation to Determine Ductility Dip in Thick XH67 Plates to Overcome Cracking during Hot Forming

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Ravi Ranjan Kumar,
  • Varsha Florist,
  • R. Santhoshkumar,
  • Shubham Kumar,
  • Sai Teja,
  • Alok Singh,
  • C. R. Anoop,
  • S. V. S. Narayana Murty,
  • N. Venkatesh,
  • M. Arumugam

摘要

XH67MBTЮ (XH67) is a nickel-based superalloy used in the fabrication of complex-shaped components (such as gas ducts) of rocket engines for high-temperature applications. A gas duct is fabricated by long seam welding of two symmetrical halves, which were realized through hot forming. During hot-forming operation, cracking of material was noted in the lower half of gas duct. In order to understand the reasons for cracking, a detailed metallurgical investigation of the failed part was carried out. Further, GleebleTM thermomechanical simulator has been employed to simulate the sequence of processes (thermal cycles and temperature drop) followed during hot forming, followed by tensile properties evaluation at varying temperatures. The simulated and tested specimens were subjected to microstructural and fractographic examination to understand the microstructural evolution during hot forming and nature of failure, respectively. The results obtained from simulated specimens were correlated with the results of specimens from failed part. Based on extensive metallurgical analysis, cracking of the material during hot forming was attributed to forming of material in the temperature range, having a dip in ductility. The results obtained from this study provided clear guidelines on the recommended range of temperature for successful hot forming of XH67 superalloy.