Research on Ductile-brittle Transition Characteristics of 11MnNiMo Steel with Fatigue Damage Based on Master Curve Method

ZHOU Chen; ZHANG Guangjun; LIU Guang; HE Jian; WANG Yulin; LI Haidong

doi:10.7643/ issn.1672-9242.2025.10.013

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (10) : 102-108. DOI: 10.7643/ issn.1672-9242.2025.10.013

Research on Ductile-brittle Transition Characteristics of 11MnNiMo Steel with Fatigue Damage Based on Master Curve Method

ZHOU Chen¹, ZHANG Guangjun¹, LIU Guang¹, HE Jian², WANG Yulin², LI Haidong^{1, *}

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Abstract

The work aims to investigate the effect of fatigue damage on the ductile-brittle transition characteristics of 11MnNiMo steel. The distribution of impact absorption energy of non-destructive 11MnNiMo steel and 11MnNiMo steel with 2 mm fatigue cracks at different temperature was studied based on the Charpy impact test method and the main curve method. The hyperbolic tangent function was employed to fit the temperature-dependent impact absorbed energy, determine the master curve's reference temperature, and derive the master curve equation for 11MnNiMo steel. Fracture morphologies at various temperature were observed via scanning electron microscopy to validate the master curve method's effectiveness in determining the ductile-brittle transition characteristics of 11MnNiMo steel. The results showed that the main curve method could accurately determine the ductile brittle transition characteristics of both non-destructive and fatigue damaged 11MnNiMo steel. The reference temperature for ductile brittle transition of non-destructive 11MnNiMo steel was ‒83 ℃, and that of 11MnNiMo steel with 2 mm fatigue cracks was ‒27 ℃. Compared with non-destructive 11MnNiMo steel, a 2 mm fatigue crack increases the reference temperature for ductile brittle transition of 11MnNiMo steel by 67%, making it more prone to brittle fracture. This study is of great significance for evaluating and predicting the fatigue life and safety of 11MnNiMo steel in practical engineering applications, providing a theoretical basis for subsequent material performance optimization and structural design.

Key words

pre-fabricated fatigue crack / master curve method / 11MnNiMo steel / Charpy impact test / ductile brittle transition reference temperature / scanning electron microscope technology

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ZHOU Chen, ZHANG Guangjun, LIU Guang, HE Jian, WANG Yulin, LI Haidong. Research on Ductile-brittle Transition Characteristics of 11MnNiMo Steel with Fatigue Damage Based on Master Curve Method[J]. Equipment Environmental Engineering. 2025, 22(10): 102-108 https://doi.org/10.7643/ issn.1672-9242.2025.10.013

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