<strong>2 GPa</strong>超高强中锰钢中的夹杂物对其高周疲劳性能的影响

doi:10.11901/1005.3093.2025.041

材料研究学报

2025, Vol. 39

Issue (12): 892-900 DOI: 10.11901/1005.3093.2025.041

研究论文

本期目录 | 过刊浏览

2 GPa超高强中锰钢中的夹杂物对其高周疲劳性能的影响

李昌鹏¹, 庞建超², 王子龙¹, 李云杰¹(

), 李琳琳¹(

)

^1.东北大学数字钢铁全国重点实验室沈阳 110819
^2.中国科学院金属研究所沈阳 110016

Effect of Size and Distribution of Inclusions on High-cycle Fatigue Properties of a 2 GPa-graded Ultra-high-strength Medium-Mn Steel

LI Changpeng¹, PANG Jianchao², WANG Zilong¹, LI Yunjie¹(

), LI Linlin¹(

)

^1.State Key Laboratory of Digital Steel, Northeastern University, Shenyang 110819, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

李昌鹏, 庞建超, 王子龙, 李云杰, 李琳琳. 2 GPa超高强中锰钢中的夹杂物对其高周疲劳性能的影响[J]. 材料研究学报, 2025, 39(12): 892-900.
Changpeng LI, Jianchao PANG, Zilong WANG, Yunjie LI, Linlin LI. Effect of Size and Distribution of Inclusions on High-cycle Fatigue Properties of a 2 GPa-graded Ultra-high-strength Medium-Mn Steel[J]. Chinese Journal of Materials Research, 2025, 39(12): 892-900.

全文: PDF(12326 KB) HTML

摘要:

测试了一种新型2 GPa级超高强中锰钢的高周疲劳性能并使用X射线衍射、扫描电镜等手段观察和分析疲劳断口形貌、相组成、夹杂物的尺寸和分布，研究了夹杂物对其高周疲劳性能的影响。结果表明，这种超高强中锰钢的高周疲劳均由夹杂物起裂，包括表面夹杂物、亚表面夹杂物以及内部夹杂物引起的三种开裂形式。随着疲劳裂纹萌生的位置由表面逐渐向内部过渡，这种钢的疲劳寿命延长。超高强中锰钢的疲劳性能对夹杂物的尺寸极其敏感，随着夹杂物起裂位置到基体表面距离的增加，其尺寸逐渐增大。同时，在应力幅相同的条件下，随着夹杂物尺寸的减小，疲劳寿命逐渐延长。与其他中高强度钢相比，这种新型2 GPa级超高强中锰钢的疲劳强度与疲劳比优异。其原因是，这种钢的多级组织使其具有优异的塑性。高塑性使局部的应力集中分散，使疲劳过程中裂纹的萌生和扩展需要更高的能量和更大的夹杂物临界尺寸。

关键词 ：金属材料, 2 GPa级中锰钢, 高周疲劳, 非金属夹杂物, 疲劳强度, 临界夹杂物尺寸

Abstract：

Inclusions can be easily introduced into steels during smelting, and they have an important impact on the fatigue cracking behavior and fatigue strength of the steels. As the strength of the steel increases, its sensitivity to microstructural defects also increases, yet the fatigue strength does not necessarily increase monotonically. Here, the high-cycle fatigue properties of a newly-developed ultra-high-strength medium-Mn steel with tensile strength higher than 2 GPa were investigated. The morphology, phase composition, distribution and size of the inclusions on the fatigue fracture were observed and analyzed by means of X-ray diffraction and scanning electron microscopy. The results indicate that the high-cycle fatigue of the ultra-high-strength steel is caused by the initiation of cracks at inclusions, which exhibit three types: surface inclusions, subsurface inclusions, and internal inclusions. The fatigue life increases as the crack initiation sites changing from surface to internal inclusions. The fatigue properties of ultra-high-strength steel are extremely sensitive to the size of inclusions. The critical size of the inclusions gradually increases as the distance between the inclusions and the test specimen surface increases. Under the same stress amplitude, the fatigue life increases with the decrease of the inclusion size. Compared with other medium- and high-strength steels, the current steel has high fatigue strength and fatigue ratio, which can be attributed to its high strength and good plasticity. The gradual transformation induced plasticity effect helped to disperse local stress concentration and dissipate plastic work to retard growth of fatigue cracks. Consequently, larger critical inclusion sizes are required for crack initiation and propagation during fatigue.

Key words： metallic materials 2 GPa-graded medium-Mn steel high-cycle fatigue non-metallic inclusions fatigue strength critical inclusion size

收稿日期: 2025-01-16

ZTFLH:

TG142.1

基金资助:国家自然科学基金(52371101);东北大学数字钢铁全国重点实验室自主课题(ZZ2021003)

通讯作者: 李琳琳，教授，lill@ral.neu.edu.cn，研究方向为金属材料的疲劳损伤机制研究;
李云杰，教授，liyunjie@ral.neu.edu.cn，研究方向为超高强钢强韧化理论及应用研究

Corresponding author: LI Linlin, Tel: 15140093270, E-mail: lill@ral.neu.edu.cn;
LI Yunjie, Tel: 15140037408, E-mail: liyunjie@ral.neu.edu.cn

作者简介: 李昌鹏，男，2000年生，硕士生

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表1 实验用2 GPa级中锰钢的化学成分

图1 实验用2 GPa级中锰钢样品的形状和尺寸示意图

图2 实验用2 GPa级中锰钢的微观组织和XRD谱

图3 实验钢的静态力学性能

图4 实验钢的S-N曲线和疲劳强度

图5 表面夹杂物疲劳开裂断口的形貌

图6 亚表面夹杂物疲劳开裂断口形貌

图7 内部夹杂物疲劳开裂断口的形貌

图8 夹杂物位于不同位置的S-N曲线和夹杂物尺寸对疲劳性能的影响

图9 用外推法测得的实验钢中夹杂物的临界尺寸

No. of samples	σ_-1 / MPa	N_f / cycles	$a r e a i n c$ / μm	Murakami formula
No. of samples	σ_-1 / MPa	N_f / cycles	$a r e a i n c$ / μm	σ_-1 / MPa	$a r e a i n c$ / μm
6	600	1 × 10⁷	37.4	523	16.4
8	660	1 × 10⁷	8.6	604	5.0
10	660	1 × 10⁷	44.9	507	9.2
11	680	1 × 10⁷	8.7	603	4.2
13	680	1 × 10⁷	14.4	554	4.1

表2 用Murakami公式反推疲劳强度和夹杂物临界尺寸

图10 实验用钢与其他强度钢性能的对比和高周疲劳后的XRD谱

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