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具有镀锌和热镀锌锌涂层的低强度和高强度钢的摩擦特性

Friction Characteristics of Low and High Strength Steels with Galvanized and Galvannealed Zinc Coatings.

作者信息

Kim Ji-Young, Yoon Seung-Chae, Jin Byeong-Keuk, Jeon Jin-Hwa, Hyun Joo-Sik, Lee Myoung-Gyu

机构信息

Automotive Steel Application Engineering Team, Hyundai Steel Company, 1480 Buckbusaneop-Ro, Songak-Eup, Dangjin-Si 31719, Republic of Korea.

Department of Materials Science and Engineering & RIAM, Seoul National University, 1 Gwanak-Ro, Gwanak-Gu, Seoul 08826, Republic of Korea.

出版信息

Materials (Basel). 2024 Oct 15;17(20):5031. doi: 10.3390/ma17205031.

DOI:10.3390/ma17205031
PMID:39459737
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11509531/
Abstract

As vehicle body structures become stronger and part designs more complex for lightweight, controlling frictional properties in automotive press forming has gained critical importance. Friction, a key factor in formability, is influenced by variables such as contact pressure, sliding velocity, sheet strength, and coatings. This study investigates the friction characteristics of steels with tensile strengths of 340 MPa and 980 MPa, under galvanized (GI) and galvannealed (GA) zinc coatings. Experimental results reveal that asperity flattening, a significant factor in determining friction, increases with contact pressure normalized by tensile strength, particularly for GI-coated steels. However, the relationship between friction and surface flattening deviates from conventional expectations, with the friction coefficient initially rising with increased flattening area up to ~20% before decreasing as flattening progresses. These findings suggest that traditional empirical formulas may not fully capture friction behavior under specific conditions. By understanding this inflection point, where friction reduces under high contact pressure, the study provides valuable insights for optimizing formability and improving sheet metal forming processes, especially in scenarios where precise friction control is critical for producing high-quality automotive parts.

摘要

随着车身结构变得更坚固，且零部件设计因轻量化而更复杂，控制汽车冲压成型中的摩擦特性已变得至关重要。摩擦是成型性的一个关键因素，它受诸如接触压力、滑动速度、板材强度和涂层等变量的影响。本研究调查了抗拉强度为340兆帕和980兆帕的钢材在镀锌（GI）和合金化镀锌（GA）锌涂层下的摩擦特性。实验结果表明，粗糙度扁平化是决定摩擦的一个重要因素，它随着抗拉强度归一化后的接触压力增加而增加，特别是对于镀锌涂层钢。然而，摩擦与表面扁平化之间的关系偏离了传统预期，摩擦系数最初随着扁平化面积增加到约20%而上升，之后随着扁平化的进展而下降。这些发现表明，传统经验公式可能无法完全捕捉特定条件下的摩擦行为。通过了解这个在高接触压力下摩擦降低的拐点，该研究为优化成型性和改进钣金成型工艺提供了有价值的见解，特别是在精确摩擦控制对生产高质量汽车零部件至关重要的情况下。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/287c/11509531/8a53d1f0989b/materials-17-05031-g012.jpg
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