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冷轧对汽车用双相钢组织和力学性能的影响

Effect of Cold Rolling on Microstructural and Mechanical Properties of a Dual-Phase Steel for Automotive Field.

作者信息

Bassini Emilio, Marchese Giulio, Sivo Antonio, Martelli Pietro Antonio, Gullino Alessio, Ugues Daniele

机构信息

Department of Applied Science and Technology (DISAT), Polytechnic University of Turin, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.

Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Firenze, Italy.

出版信息

Materials (Basel). 2022 Oct 25;15(21):7482. doi: 10.3390/ma15217482.

DOI:10.3390/ma15217482
PMID:36363071
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9659092/
Abstract

A new advanced dual-phase (DP) steel characterized by ferrite and bainite presence in equal fractions has been studied within this paper. The anisotropy change of this steel was assessed as a progressively more severe cold rolling process was introduced. Specifically, tensile tests were used to build a strain-hardening curve, which describes the evolution of this DP steel's mechanical properties as the thinning level increases from 20 to 70% with 10% step increments. As expected, the cold rolling process increases mechanical properties, profoundly altering the material's microstructure, which was assessed in depth using Electron Backscatter Diffraction (EBSD) analysis coupled with the Kernel Average Misorientation (KAM) maps. At the same time, the process strongly modifies the material planar anisotropy. Microstructural and mechanical assessment and the Kocks-Mecking model applied to this steel evidenced that a 50% strain hardening makes the DP steel isotropic. The material retains or resumes anisotropic behavior for a lower or higher degree of deformation. Furthermore, the paper evaluated the forming limit of this DP steel and introduced geometric limitations to testing the thin steel plates' mechanical properties.

摘要

本文研究了一种新型的先进双相（DP）钢，其特征是铁素体和贝氏体含量相等。随着冷轧工艺逐渐变得更加严苛，对这种钢的各向异性变化进行了评估。具体而言，通过拉伸试验构建了应变硬化曲线，该曲线描述了随着减薄率从20%增加到70%（以10%的步长递增），这种双相钢力学性能的演变。正如预期的那样，冷轧工艺提高了力学性能，深刻改变了材料的微观结构，通过电子背散射衍射（EBSD）分析结合核平均取向差（KAM）图对微观结构进行了深入评估。同时，该工艺强烈改变了材料的平面各向异性。对这种钢进行的微观结构和力学评估以及应用的科克斯 - 梅金模型证明，50%的应变硬化使双相钢呈现各向同性。对于较低或较高程度的变形，材料保持或恢复各向异性行为。此外，本文评估了这种双相钢的成形极限，并引入了几何限制来测试薄钢板的力学性能。

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本文引用的文献

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2
EBSD as a tool to identify and quantify bainite and ferrite in low-alloyed Al-TRIP steels.电子背散射衍射（EBSD）作为一种识别和量化低合金铝-相变诱发塑性（Al-TRIP）钢中贝氏体和铁素体的工具。
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3
Inverse temperature dependence of toughness in an ultrafine grain-structure steel.
超声强化磨削与激光加工制备的Ti6Al4V合金复合织构的摩擦学性能
Materials (Basel). 2022 Dec 30;16(1):355. doi: 10.3390/ma16010355.
超细晶粒结构钢中韧性的逆温度依赖性。
Science. 2008 May 23;320(5879):1057-60. doi: 10.1126/science.1156084.