Formability behavior of friction stir processed dual phase steel

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Metallurgical Research & Technology Pub Date : 2021-01-01 DOI:10.1051/metal/2021083

S. M. Aktarer, T. Küçükömeroğlu

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引用次数: 2

Abstract

This study investigated the formability behavior of dual-phase (DP) steel subjected to friction stir process (FSP), using a miniaturized Erichsen test. The friction stir process yielded a refined microstructure, which consisted of lath martensite and fine ferrite, as a result of dynamic recrystallization (DRX) and phase transformation. Both yield and tensile strength were significantly increased via the grain refinement and increasing martensite fraction. Biaxial formability behavior of the friction stir processed sample exhibited a decline as the Erichsen index (EI) decreased from 2.7 mm to 2.2 mm. However, the required punch load (FEI) increased compatibly with the strength value after FSP. The grain refinement caused by FSP led to an improvement in the orange peel effect, defined as a negative effect of increased surface roughness after metal forming. The value of mean roughness in the free dome surface of the FSPed sample decreased from 4.90 μm to 2.62 μm. It can be concluded that the roughening with the orange peel effect on free surfaces of stretched metal can be eliminated by the friction stir process.

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搅拌摩擦加工双相钢的成形性能

采用小型Erichsen试验研究了双相(DP)钢在搅拌摩擦过程(FSP)下的成形性能。在搅拌摩擦过程中，由于动态再结晶(DRX)和相变，形成了由板条马氏体和细铁素体组成的细化组织。晶粒细化和马氏体分数的增加显著提高了屈服强度和抗拉强度。随着Erichsen指数(EI)从2.7 mm减小到2.2 mm，搅拌摩擦试样的双轴成形性能有所下降。然而，FSP后所需的冲孔载荷(FEI)随强度值的增加而增加。FSP引起的晶粒细化导致了橘皮效应的改善，橘皮效应被定义为金属成形后表面粗糙度增加的负面影响。FSPed样品的自由圆顶表面平均粗糙度值由4.90 μm降至2.62 μm。结果表明，搅拌摩擦可以消除拉伸后金属自由表面的橘皮粗化现象。

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来源期刊

Metallurgical Research & Technology METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.70

自引率

9.10%

发文量

审稿时长

4.4 months

期刊介绍： Metallurgical Research and Technology (MRT) is a peer-reviewed bi-monthly journal publishing original high-quality research papers in areas ranging from process metallurgy to metal product properties and applications of ferrous and non-ferrous metals and alloys, including light-metals. It covers also the materials involved in the metal processing as ores, refractories and slags. The journal is listed in the citation index Web of Science and has an Impact Factor. It is highly concerned by the technological innovation as a support of the metallurgical industry at a time when it has to tackle severe challenges like energy, raw materials, sustainability, environment... Strengthening and enhancing the dialogue between science and industry is at the heart of the scope of MRT. This is why it welcomes manuscripts focusing on industrial practice, as well as basic metallurgical knowledge or review articles.