کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1577227 | 1514794 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Bake hardening of ultra-fine grained low carbon steel produced by constrained groove pressing Bake hardening of ultra-fine grained low carbon steel produced by constrained groove pressing](/preview/png/1577227.png)
In the present work, the bake hardening of ultra-fine grained low carbon steel was compared with that of its coarse-grain counterpart. The ultra-fine grained sheets were produced by applying three passes of constrained groove pressing resulting the grains of 260–270 nm. The microstructure of ultra-fine grain specimens were characterized using electron back-scatter diffraction technique. Then, the bake hardenability of ultra-fine grain and coarse-grain samples were compared by pre-straining to 4, 6 and 8% followed by baking at 150 °C and 250 °C for 20 min. The results show that in case of baking at 250 °C, there was an increase about 108%, 93%, and 72% in the bake hardening for 4%, 6% and 8% pre-strain, respectively. As for baking at 150 °C, these values were 170%, 168%, and 100%, respectively for 4%, 6% and 8% pre-strain. The maximum in bake hardenability (103 MPa) and final yield stress (563 MPa) were pertaining to the ultra-fine grain specimen pre-strained 8% followed by baking at 250 °C.
► BH of UFG low carbon steel sheets was studied.
► Three passes of CGP are used for producing of UFG sheets.
► Maximum BH was achieved to the UFG specimen pre-strained 8% by baking at 250 °C.
Journal: Materials Science and Engineering: A - Volume 549, 15 July 2012, Pages 157–162