Enhancing stretch-flangeability in high-strength hot-rolled automotive steel: the role of interface affected zone in optimized microstructure

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-21 DOI:10.1016/j.msea.2025.149144

Mingyue Yang , Jun Lu , Shuize Wang , Yuhe Huang , Qinglin Shan , Shuyang Ren , Tong Chen , Shuang Kuang , Xinping Mao

{"title":"Enhancing stretch-flangeability in high-strength hot-rolled automotive steel: the role of interface affected zone in optimized microstructure","authors":"Mingyue Yang , Jun Lu , Shuize Wang , Yuhe Huang , Qinglin Shan , Shuyang Ren , Tong Chen , Shuang Kuang , Xinping Mao","doi":"10.1016/j.msea.2025.149144","DOIUrl":null,"url":null,"abstract":"<div><div>Advanced high-strength steels (AHSS) used in automotive components demand excellent stretch-flangeability, quantified by the hole expansion ratio (HER). This study investigates the influence of microstructure—specifically ferrite + bainite, ferrite, and ferrite + pearlite—on HER at comparable strength levels in AHSS. The ferrite + bainite structure exhibits superior stretch-flangeability performance than the ferrite and ferrite + pearlite, attributed to the optimized ferrite + bainite structure which featuring a gradient strain layer characterized as interface affected zone (IAZ). This structure promotes stretch-flangeability by facilitating a smooth hardness transition between soft domain (ferrite) and hard domain (bainite). Such transition improves the uniformity of stress distribution. Furthermore, a low coiling temperature of 550 °C refines both the effective grain size and the size of nano-precipitates at grain boundaries, thereby further reducing stress concentration. These findings highlight the potential of introducing gradient distributed IAZ in optimizing AHSS stretch-flangeability for automotive applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149144"},"PeriodicalIF":7.0000,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science and Engineering: A","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921509325013681","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Advanced high-strength steels (AHSS) used in automotive components demand excellent stretch-flangeability, quantified by the hole expansion ratio (HER). This study investigates the influence of microstructure—specifically ferrite + bainite, ferrite, and ferrite + pearlite—on HER at comparable strength levels in AHSS. The ferrite + bainite structure exhibits superior stretch-flangeability performance than the ferrite and ferrite + pearlite, attributed to the optimized ferrite + bainite structure which featuring a gradient strain layer characterized as interface affected zone (IAZ). This structure promotes stretch-flangeability by facilitating a smooth hardness transition between soft domain (ferrite) and hard domain (bainite). Such transition improves the uniformity of stress distribution. Furthermore, a low coiling temperature of 550 °C refines both the effective grain size and the size of nano-precipitates at grain boundaries, thereby further reducing stress concentration. These findings highlight the potential of introducing gradient distributed IAZ in optimizing AHSS stretch-flangeability for automotive applications.

查看原文本刊更多论文

提高高强度热轧汽车钢的拉伸-翻边性：界面影响区在优化显微组织中的作用

用于汽车零部件的先进高强度钢（AHSS）需要优异的拉伸-法兰性，用孔膨胀比（HER）来量化。本研究探讨了在AHSS中强度水平相当时，微观结构（特别是铁素体+贝氏体、铁素体和铁素体+珠光体）对HER的影响。由于优化后的铁素体+贝氏体结构存在以界面影响区（IAZ）为特征的梯度应变层，铁素体+贝氏体结构的拉伸-翻折性能优于铁素体和铁素体+珠光体。这种结构通过促进软域（铁素体）和硬域（贝氏体）之间的平滑硬度过渡来提高拉伸-法兰性。这种转变提高了应力分布的均匀性。此外，550℃的低卷取温度细化了有效晶粒尺寸和晶界处纳米析出物的尺寸，从而进一步降低了应力集中。这些发现强调了引入梯度分布IAZ在优化汽车应用AHSS拉伸法兰性方面的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.