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<p>This work systematically elucidates the role of Zr content in governing the secondary phase particles, microstructures, the fracture behavior on the longitudinal and transverse section, and low-temperature impact toughness of the heat-affected zone (HAZ) in Mg–Ca–Zr deoxidized steels after high heat input welding of 400 kJ/cm. The study is conducted for two steels containing 0.008 wt pct Zr (80Zr) and 0.035 wt pct Zr (350Zr), with specimens sampled along the longitudinal and transverse section to fracture surface of HAZ. The area fraction of intragranular acicular ferrite in HAZ of 80Zr steel is 64.9 pct, acting in conjunction with the high density of high-angle grain boundaries to promote the crack deflection and enhance the energy absorption. Conversely, the HAZ of the 350Zr steel contains large number of coarse Zr(C,N) precipitates and hard martensite–austenite constituents, which provide the sites for microcrack initiation. As a result, the 80Zr steel achieved outstanding low-temperature impact toughness of 214 J at −&#xa0;40 °C, drastically surpassing 6 J of the 350Zr steel.</p>

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Influence of Zr Content on Fracture Characteristics in the Heat-Affected Zone of Mg–Ca–Zr Deoxidized Steel Under HHIW

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Yanli Chen,
  • Jian Yang,
  • Yinhui Zhang,
  • Liang Wang,
  • Yuqi Zhang

摘要

This work systematically elucidates the role of Zr content in governing the secondary phase particles, microstructures, the fracture behavior on the longitudinal and transverse section, and low-temperature impact toughness of the heat-affected zone (HAZ) in Mg–Ca–Zr deoxidized steels after high heat input welding of 400 kJ/cm. The study is conducted for two steels containing 0.008 wt pct Zr (80Zr) and 0.035 wt pct Zr (350Zr), with specimens sampled along the longitudinal and transverse section to fracture surface of HAZ. The area fraction of intragranular acicular ferrite in HAZ of 80Zr steel is 64.9 pct, acting in conjunction with the high density of high-angle grain boundaries to promote the crack deflection and enhance the energy absorption. Conversely, the HAZ of the 350Zr steel contains large number of coarse Zr(C,N) precipitates and hard martensite–austenite constituents, which provide the sites for microcrack initiation. As a result, the 80Zr steel achieved outstanding low-temperature impact toughness of 214 J at − 40 °C, drastically surpassing 6 J of the 350Zr steel.