Size and microstructural factors affecting the micro-hole expansion ratio and fracture toughness of dual phase steel sheets

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-11-12 DOI:10.1016/j.msea.2024.147517

Soudip Basu , Balila Nagamani Jaya , Rohit Kumar Yadav , Sarbari Ganguly , Monojit Dutta

{"title":"Size and microstructural factors affecting the micro-hole expansion ratio and fracture toughness of dual phase steel sheets","authors":"Soudip Basu , Balila Nagamani Jaya , Rohit Kumar Yadav , Sarbari Ganguly , Monojit Dutta","doi":"10.1016/j.msea.2024.147517","DOIUrl":null,"url":null,"abstract":"<div><div>The microscopic hole expansion ratio (μHER) of a ferritic-martensitic (∼10 %) dual phase steel was measured using a novel in-situ scanning electron microscope based miniature hole expansion setup. The effect of extrinsic parameters such as specimen thickness and machining conditions, and intrinsic parameters such as hardness differential (ΔH =Hα'-Hα) between the soft ferrite matrix and hard martensite islands on μHER values was studied. The miniature HER setup allowed site-specific measurement of microscopic strain localizations in the DP microstructure through high resolution digital image correlation under the triaxial state of stress. The results from these experiments were juxtaposed against another triaxial state of stress ahead of a crack tip, in a fracture toughness (JIc) test using the single edge notched tensile (SENT) geometry for the same thickness and microstructural conditions of DP steel. It was found that the tempered DP specimen with lower ΔH resulted in a ∼45 % higher μHER as compared to the as-received DP600, although both specimens exhibited similar JIc values. This apparent discrepancy between the trends in μHER and JIc values was explained in terms of the differences in failure modes, triaxiality and plastic zone evolution in the two conditions.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147517"},"PeriodicalIF":6.1000,"publicationDate":"2024-11-12","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/S0921509324014485","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

The microscopic hole expansion ratio (μHER) of a ferritic-martensitic (∼10 %) dual phase steel was measured using a novel in-situ scanning electron microscope based miniature hole expansion setup. The effect of extrinsic parameters such as specimen thickness and machining conditions, and intrinsic parameters such as hardness differential (ΔH =H_α'-H_α) between the soft ferrite matrix and hard martensite islands on μHER values was studied. The miniature HER setup allowed site-specific measurement of microscopic strain localizations in the DP microstructure through high resolution digital image correlation under the triaxial state of stress. The results from these experiments were juxtaposed against another triaxial state of stress ahead of a crack tip, in a fracture toughness (J_Ic) test using the single edge notched tensile (SENT) geometry for the same thickness and microstructural conditions of DP steel. It was found that the tempered DP specimen with lower ΔH resulted in a ∼45 % higher μHER as compared to the as-received DP600, although both specimens exhibited similar J_Ic values. This apparent discrepancy between the trends in μHER and J_Ic values was explained in terms of the differences in failure modes, triaxiality and plastic zone evolution in the two conditions.

查看原文本刊更多论文

影响双相钢板微孔扩展率和断裂韧性的尺寸和微结构因素

使用基于微型孔膨胀装置的新型原位扫描电子显微镜测量了铁素体-马氏体（∼10 %）双相钢的微观孔膨胀率（μHER）。研究了试样厚度和加工条件等外在参数以及软铁素体基体和硬马氏体岛之间的硬度差 (ΔH =Hα'-Hα) 等内在参数对 μHER 值的影响。微型 HER 设置允许在三轴应力状态下通过高分辨率数字图像相关性对 DP 显微结构中的微观应变定位进行特定部位测量。在对相同厚度和微观结构条件的 DP 钢进行断裂韧性（JIc）测试时，采用单边缺口拉伸（SENT）几何形状，将这些实验结果与裂纹尖端前的另一种三轴应力状态并列。结果发现，与原样 DP600 相比，回火 DP 试样的 ΔH 较低，导致 μHER 高出 45%，尽管两种试样的 JIc 值相似。μHER和JIc值趋势之间的这种明显差异可以用两种条件下的失效模式、三轴性和塑性区演变的差异来解释。

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.