利用激光抛光优化板材边缘质量:表面特征和性能评估

IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING International Journal of Material Forming Pub Date : 2024-07-30 DOI:10.1007/s12289-024-01847-7
Dongsong Li, Stefanie Linnenbrink, Berk Tekkaya, Michael Dölz, Edgar Willenborg, Markus Könemann, Sebastian Münstermann
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引用次数: 0

摘要

双相钢(DP)因其优异的性能而广泛应用于汽车行业。它具有出色的强度、延展性、成型性和焊接性。然而,边缘开裂的风险很高,尤其是在 DP1000 钢等材料中,这是由冲裁过程中的残余损伤(如微裂纹和毛刺)引起的,需要进一步研究。本研究调查了激光抛光对 DP1000 钢的改造潜力。目的是降低边缘裂纹敏感性并提高边缘成形性。在这项工作中,对通过锯切、冲孔和水刀切割等各种预制造技术生产的激光抛光样品进行了检查。对激光抛光样品进行了各种评估。其中包括白光共焦显微镜、扫描电子显微镜和电子背散射衍射(EBSD)分析。这些评估旨在分析激光抛光产生的微观结构转变、表面粗糙度和微粒尺寸分布。激光抛光是一种对样品边缘进行局部重熔的工艺。因此,残余损伤消失,表面缺陷也随之消失,这对边缘成形性应该是有利的。另一方面,重新凝固过程中的冷却速度很高,导致与初始 DP 钢相比强度高而延展性降低。因此,我们进行了扩孔试验,以评估钢材的边缘成形性。结果表明,与传统制造边缘的样品相比,激光抛光样品的孔扩展率明显提高。这些发现将有助于评估激光抛光在板材制造中的优势和局限性。
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Optimizing sheet metal edge quality with laser-polishing: surface characterization and performance evaluation

Dual-phase (DP) steels are widely used in the automotive industry due to their exceptional performance. It offers excellent strength, ductility, formability, and weldability. However, there is a high risk of edge cracking, particularly in materials like DP1000 steel, caused by residual damage from blanking, such as microcracks and burrs, which needs further investigation. In this study, the transformative potential of laser-polishing on DP1000 steel was investigated. The goal was to reduce edge crack sensitivity and enhance edge formability. In this work, laser-polished samples produced by various pre-manufacturing techniques such as sawing, punching, and waterjet cutting were examined. Various evaluations were performed on laser-polished samples. Those included white-light-confocal microscopy, scanning electron microscopy, and Electron Backscatter Diffraction (EBSD) analysis. Those evaluations aimed to analyze the microstructural transformation, surface roughness, and micro grain size distribution resulting from laser-polishing. Laser-polishing is a process in which the edge of the sample is remelted locally. Hence, residual damage vanishes, and surface defects disappear, which should be beneficial for edge formability. On the other hand, the cooling rate during re-solidification is high, leading to high strength and reduced ductility compared to the initial DP steel. Therefore, hole expansion tests were conducted to evaluate the edge formability of the steel. The results indicated a significant improvement in the hole expansion ratio of the laser-polished samples compared to samples with conventional manufactured edges. These findings will help to assess the advantages and limitations of laser-polishing in sheet material manufacturing.

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来源期刊
International Journal of Material Forming
International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
5.10
自引率
4.20%
发文量
76
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.
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