Formability of friction stir processed low carbon steels used in shipbuilding
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第1期
论文作者：D.M.Sekban S.M.Akterer O.Saray Z.Y.Ma G.Purcek
文章页码：237 - 244
摘 要：The stretch formability of a low carbon steel processed by friction stir processing（FSP） was studied under biaxial loading condition applied by a miniaturized Erichsen test. One-pass FSP decreased the ferritic grain size in the processed zone from 25 m to about 3 m, which also caused a remarkable increase in strength values without considerable decrease in formability under uniaxial loading. A coarse-grained（CG） sample before FSP reflected a moderate formability with an Erichsen index（EI） of 2.73 mm. FSP slightly decreased the stretch formability of the sample to 2.66 mm. However, FSP increased the required punch load（FEI）due to the increased strength by grain refinement. FSP reduced considerably the roughness of the free surface of the biaxial stretched samples with reduced orange peel effect. The average roughness value（Ra） decreased from 2.90 in the CG sample down to about 0.65 m in fine-grained（FG） sample after FSP.It can be concluded that the FG microstructure in low carbon steels sheets or plates used generally in shipbuilding provides a good balance between strength and formability.
D.M.Sekban1，S.M.Akterer2，O.Saray3，Z.Y.Ma4，G.Purcek5,6
1. Department of Naval Architecture and Marine Engineering, Karadeniz Technical University2. Department of Automotive Technology, Recep Tayyip Erdogan University3. Department of Mechanical Engineering, Bursa Technical University4. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences5. Department of Mechanical Engineering, Karadeniz Technical University6. Engineering Faculty, Giresun University
摘 要：The stretch formability of a low carbon steel processed by friction stir processing（FSP） was studied under biaxial loading condition applied by a miniaturized Erichsen test. One-pass FSP decreased the ferritic grain size in the processed zone from 25 m to about 3 m, which also caused a remarkable increase in strength values without considerable decrease in formability under uniaxial loading. A coarse-grained（CG） sample before FSP reflected a moderate formability with an Erichsen index（EI） of 2.73 mm. FSP slightly decreased the stretch formability of the sample to 2.66 mm. However, FSP increased the required punch load（FEI）due to the increased strength by grain refinement. FSP reduced considerably the roughness of the free surface of the biaxial stretched samples with reduced orange peel effect. The average roughness value（Ra） decreased from 2.90 in the CG sample down to about 0.65 m in fine-grained（FG） sample after FSP.It can be concluded that the FG microstructure in low carbon steels sheets or plates used generally in shipbuilding provides a good balance between strength and formability.
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