A multi-scale analysis on the enhanced local formability of DP1000 steel by laser-polishing

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING

International Journal of Material Forming Pub Date : 2025-10-14 DOI:10.1007/s12289-025-01945-0

Dongsong Li, Berk Tekkaya, Chengbiao Shen, Sebastian Münstermann

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引用次数: 0

Abstract

Advanced high-strength steels, particularly dual-phase (DP) steels like DP1000, are widely used in the automotive industry due to their exceptional strength and ductility. However, DP steels are sensitive to edge cracking caused by damage and edge surface roughness from conventional cutting processes such as punching. Laser-polishing has emerged as a technique to enhance edge quality by melting and reshaping the material, potentially improving formability. This study aims to investigate the enhanced formability of DP1000 steel achieved through laser-polishing using a multi-scale simulation approach. Hole expansion tests were conducted on DP1000 steel samples with varying edge profiles: punched and laser-polished edges with different geometries. Surface roughness profiles were characterized using white-light confocal microscopy. The modified coupled Bai-Wierzbicki damage model is used in the numerical calculations. Considering the effect of surface roughness, a surface factor is applied in the proposed damage and fracture locus to characterize the material behavior more accurately. Multi-scale FE simulations combined macroscopic modeling of the hole expansion test and microscopic modeling that incorporated actual surface roughness profiles. The numerically predicted force–displacement curves and hole expansion ratios for punched and laser-polished specimens align well with the experimental results. The inclusion of the surface factor in the MBW model effectively captured the influence of surface roughness and microstructural transformations on the material's formability.

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激光抛光提高DP1000钢局部成形性能的多尺度分析

先进的高强度钢，特别是像DP1000这样的双相（DP）钢，由于其卓越的强度和延展性而广泛应用于汽车工业。然而，DP钢对传统切割工艺（如冲孔）造成的损伤和边缘表面粗糙度引起的边缘开裂很敏感。激光抛光已经成为一种通过熔化和重塑材料来提高边缘质量的技术，有可能改善成形性。本研究旨在利用多尺度模拟方法研究激光抛光对DP1000钢成形性能的提高。对具有不同边缘轮廓的DP1000钢试样进行了扩孔试验：不同几何形状的冲孔边缘和激光抛光边缘。用白光共聚焦显微镜对表面粗糙度进行了表征。数值计算采用修正的Bai-Wierzbicki耦合损伤模型。考虑到表面粗糙度的影响，在提出的损伤和断裂轨迹中加入了一个表面因子，以更准确地表征材料的行为。多尺度有限元模拟结合了孔膨胀试验的宏观建模和结合实际表面粗糙度剖面的微观建模。数值预测的冲孔和激光抛光试样的力-位移曲线和孔洞膨胀率与实验结果吻合较好。MBW模型中包含的表面因素有效地捕捉了表面粗糙度和微观组织转变对材料成形性的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.