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<p>Electropulsing treatment (EPT) was applied to modify microstructure and mechanical properties of 300&#xa0;M steel. The size of sub-grains with high angle boundaries was refined after EPT. The average width of martensitic laths was reduced. The density of geometrically necessary dislocations (GNDs) in electropulsing (EP) treated sample was 1.66 times higher than that in conventional austenitized sample when tempered at 300&#xa0;°C for 1&#xa0;h. Higher dislocations density resulted in higher tempering precipitates density. Compared with mechanical properties of samples after conventional heat treatment, EP austenitized samples had better mechanical properties after same tempering treatment. The optimal mechanical properties were obtained by EP austenitizing and tempering at 300&#xa0;°C for 1&#xa0;h. Corresponding yield strength and ultimate tensile strength were improved to 1875&#xa0;MPa and 2215&#xa0;MPa, respectively, and simultaneously accompanied with better elongation and toughness. The results show EPT can be used to strengthen 300&#xa0;M steel with better ductility and toughness balances.</p>

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Strength Improvement with Ductility and Toughness Balance in Electropulsing Processed 2.2GPa 300 M Steel

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Jiatao Zhang,
  • Zhaohua Liu

摘要

Electropulsing treatment (EPT) was applied to modify microstructure and mechanical properties of 300 M steel. The size of sub-grains with high angle boundaries was refined after EPT. The average width of martensitic laths was reduced. The density of geometrically necessary dislocations (GNDs) in electropulsing (EP) treated sample was 1.66 times higher than that in conventional austenitized sample when tempered at 300 °C for 1 h. Higher dislocations density resulted in higher tempering precipitates density. Compared with mechanical properties of samples after conventional heat treatment, EP austenitized samples had better mechanical properties after same tempering treatment. The optimal mechanical properties were obtained by EP austenitizing and tempering at 300 °C for 1 h. Corresponding yield strength and ultimate tensile strength were improved to 1875 MPa and 2215 MPa, respectively, and simultaneously accompanied with better elongation and toughness. The results show EPT can be used to strengthen 300 M steel with better ductility and toughness balances.