基于主曲线法的含疲劳裂纹11MnNiMo钢韧脆转变特性研究

周琛; 张广军; 刘广; 何建; 王昱霖; 李海东

doi:10.7643/ issn.1672-9242.2025.10.013

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装备环境工程 ›› 2025, Vol. 22 ›› Issue (10) : 102-108. DOI: 10.7643/ issn.1672-9242.2025.10.013

重大工程装备

基于主曲线法的含疲劳裂纹11MnNiMo钢韧脆转变特性研究

周琛¹, 张广军¹, 刘广¹, 何建², 王昱霖², 李海东^{1, *}

作者信息 +

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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文章历史 +

摘要

目的探究疲劳损伤对11MnNiMo钢韧脆转变特性的影响。方法基于夏比冲击试验方法,结合主曲线法对无损和含2 mm疲劳裂纹11MnNiMo钢在不同温度下冲击吸收功的分布规律进行研究。利用双曲正切函数拟合冲击吸收功随温度的变化关系,求得主曲线的参考温度,进而获得11MnNiMo钢的主曲线表达式。通过扫描电镜技术观察不同温度下试样的断口形貌,验证主曲线法在确定11MnNiMo钢韧脆转变特性中的有效性。结果主曲线法能够准确确定无损和含疲劳损伤11MnNiMo钢的韧脆转变特性,无损11MnNiMo钢韧脆转变参考温度为‒83 ℃,含2 mm疲劳裂纹11MnNiMo钢韧脆转变参考温度为‒27 ℃。结论相较于无损11MnNiMo钢,2 mm疲劳裂纹使得11MnNiMo钢的韧脆转变参考温度提高了67%,更易发生脆断。本研究对于实际工程应用中评估和预测11MnNiMo钢的疲劳寿命和安全性具有重要意义,为后续的材料性能优化和结构设计提供了理论依据。

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.

导出引用

周琛, 张广军, 刘广, 何建, 王昱霖, 李海东. 基于主曲线法的含疲劳裂纹11MnNiMo钢韧脆转变特性研究[J]. 装备环境工程. 2025, 22(10): 102-108 https://doi.org/10.7643/ issn.1672-9242.2025.10.013

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

中图分类号： TG142

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