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Microstructure, mechanical properties and formability of friction stir processed interstitial-free steel
Sekban, D. M.; Saray, O.; Aktarer, S. M.; Purcek, G.; Ma, Z. Y.; purcek@ktu.edu.tr
2015
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume642Pages:57-64
AbstractThe microstructure, mechanical properties and stretch formability of fine-grained (FG) interstitial-free steel (IF-steel) formed by friction stir processing (FSP) was investigated systematically. One-pass FSP drastically refined the microstructure with aid of dynamic recrystallization (DRX) mechanism during processing and formed volumetric defect free basin-like processed region (PR) with a mean grain size of 5 mu m (initial grain size was 40 mu m). This microstructural evolution brought about a considerable increase in both hardness and strength values of IF-steel without considerable decrease in ductility values. Also, strain hardening dominated deformation behavior was obtained with the FSPed samples as an essential property for the engineering application. Coarse-grained (CG) IF-steel demonstrated high formability with an Erichsen index (El) of 2.88 mm. Grain refinement by FSP yielded very close El value of 2.80 mm with increasing punch load (F-El). Force-displacement curves obtained in each process conditions reflected a similar membrane straining regimes where samples uniformly thinned under biaxial tension loads with aid of strain hardening capability. The formation of FG microstructure by FSP reduced the roughness (orange peel effect) of the free surface of biaxial stretched sample by decreasing the nonuniform grain flow leading to the so-called orange peel effect. It is concluded that a good balance of strength, ductility and strain hardenability along with equivalence formability to CG condition can be achieved by FSP as a single step practical procedure. (C) 2015 Elsevier B.V. All rights reserved.
description.department[sekban, d. m.] karadeniz tech univ, dept naval architecture & marine engn, trabzon, turkey ; [saray, o.] bursa tech univ, dept mech engn, bursa, turkey ; [aktarer, s. m.] receptayyip erdogan univ, dept automot technol, rize, turkey ; [purcek, g.] karadeniz tech univ, dept mech engn, trabzon, turkey ; [ma, z. y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
KeywordIf-steels Friction Stir Processing Grain Refinement Formability
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74994
Collection中国科学院金属研究所
Corresponding Authorpurcek@ktu.edu.tr
Recommended Citation
GB/T 7714
Sekban, D. M.,Saray, O.,Aktarer, S. M.,et al. Microstructure, mechanical properties and formability of friction stir processed interstitial-free steel[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2015,642:57-64.
APA Sekban, D. M.,Saray, O.,Aktarer, S. M.,Purcek, G.,Ma, Z. Y.,&purcek@ktu.edu.tr.(2015).Microstructure, mechanical properties and formability of friction stir processed interstitial-free steel.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,642,57-64.
MLA Sekban, D. M.,et al."Microstructure, mechanical properties and formability of friction stir processed interstitial-free steel".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 642(2015):57-64.
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