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<p>The aim of this study is to investigate the thermal shock resistance of austenitic heat-resistant cast steels, one of the required high temperature mechanical properties for heat treatment jigs. The experimental cast steels were subjected to the cyclic thermal shock test by repeating 300 cycles of heating to 950&#xa0;°C followed by quenching under no load. Before testing, the differences in as-cast microstructure and thermophysical properties due to variation in carbon content were examined. As a result, thermal shock generated by cyclic heat treatment caused deformation and cracking near the surface and inside test pieces. It was found that both primary carbides and secondary carbides play a role in suppressing the deformation. The crack initiation and propagation paths near the surface were different from those inside the test piece, which related to the microstructural evolution.</p>

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Influence of Carbon Content on Thermal Shock Resistance of Austenitic Heat-Resistant Cast Steels

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Huynh Kinh Luan Ngo,
  • Kaoru Yamamoto,
  • Masaru Nakayama,
  • Tetsuya Okuyama,
  • Hiroshi Noguchi,
  • Kuniaki Mizuno

摘要

The aim of this study is to investigate the thermal shock resistance of austenitic heat-resistant cast steels, one of the required high temperature mechanical properties for heat treatment jigs. The experimental cast steels were subjected to the cyclic thermal shock test by repeating 300 cycles of heating to 950 °C followed by quenching under no load. Before testing, the differences in as-cast microstructure and thermophysical properties due to variation in carbon content were examined. As a result, thermal shock generated by cyclic heat treatment caused deformation and cracking near the surface and inside test pieces. It was found that both primary carbides and secondary carbides play a role in suppressing the deformation. The crack initiation and propagation paths near the surface were different from those inside the test piece, which related to the microstructural evolution.