On the overlooked role of microstructure to explain post-punching fatigue performance of advanced high-strength steel

被引：0

作者：

Heshmati, Nader ^{[1
]}

Hoseini-Athar, Mohammad ^{[1
]}

Olsson, Erik ^{[2
]}

Borgenstam, Annika ^{[1
]}

Sieurin, Henrik ^{[3
]}

Larsson, Joachim ^{[4
]}

Lee, Tung Lik ^{[5
]}

Hedstrom, Peter ^{[1
]}

机构：

[1] KTH Royal Inst Technol, Dept Mat Sci & Engn, Brinellvagen 23, SE-10044 Stockholm, Sweden

[2] Lulea Univ Technol, Dept Engn Sci & Math, Div Solid Mech, S-97187 Lulea, Sweden

[3] Scania CV AB, Mat Technol, SE-15187 Sodertalje, Sweden

[4] SSAB Oxelosund, S-61380 Oxelosund, Sweden

[5] STFC Rutherford Appleton Lab, ISIS Neutron & Muon Source, Harwell Campus, Didcot OX11 0QX, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2025年 / 927卷

关键词：

Advanced high-strength steel (AHSS); Hole punching; Fatigue; Crack initiation; Multiphase microstructure; Microscopy; SHEAR-AFFECTED ZONE; HIGH-CYCLE; CRACK INITIATION; TENSILE-STRENGTH; EDGE; PROPAGATION; FORMABILITY; MECHANISM; BEHAVIOR; FAILURE;

D O I：

10.1016/j.msea.2025.147946

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study compares the role of microstructure on post-punching fatigue properties in three advanced high- strength steels (AHSSs) with a high-strength low-alloy (HSLA) steel commonly used in heavy-duty truck chassis. Microstructure characterization, tensile testing, high cycle fatigue (HCF) testing, fatigue crack growth rate (FCGR) testing, and neutron residual stress measurements are conducted. Punching significantly alters the microstructure, causing microstructure refinement, sub-grain formation, defect creation, tensile residual stresses, and a work-hardened shear-affected zone (SAZ) around, and a rough fracture zone, inside the punched hole. At 105 cycles, the HCF performance is primarily governed by the fatigue crack growth resistance of the as-rolled microstructure, with minimal sensitivity to punching. However, near the fatigue limit, post-punching fatigue failure is strongly related to strain localization when significant strength difference exists between micro- constituents (e.g., martensite and ferrite). Strain localization also promotes sub-grain formation, reducing the local threshold stress intensity factor range (Delta Kth), thus facilitating fatigue crack initiation. In microstructures with smaller strength differences (e.g., ferrite and bainite), sub-grains, together with surface roughness and residual stress, contribute significantly to the post-punching fatigue limit reduction. These findings provide insights into mechanisms of punching-induced fatigue performance degradation, offering potential strategies to optimize fatigue performance of AHSS for new applications.

引用

页数：15

共 56 条

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