NDLI: Development of Cu-bearing bake-hardenable steel sheets for automotive exposed panels

Content Provider	Springer Nature Link
Author	Hong, Moon Hi Cho, Noi Ha Kim, Sung Il Kwon, Ohjoon Lim, Sung Hwan Moon, Won Jin
Copyright Year	2010
Abstract	Recently, newly developed bake-hardenable (BH) steel sheets strengthened by copper sulfide (CuS) have been successfully employed in commercial production lines that supply automotive outer panels. The metallurgical concepts governing fabrication of these new BH steel sheets require keeping carbon content as low as 0.0015 wt.% without any additional amount of titanium and/or niobium for solute carbon scavenging. The role of CuS precipitates has turned out to raise the yield strength acting as a barrier against dislocation movement. In this paper, we studied the effects of chemical compositions and manufacturing process variables on the microstructure and mechanical properties of newly developed BH steel sheets. We found that the control of carbon and nitrogen showed a good balance between bake-hardenability (BH) and yield point elongation (YP-El). We identified the crystallographic relationship between the nano-size CuS precipitates and the ferrite matrix of (001)$_{sulfide}$//(001)$_{α-Fe}$ and [001]$_{sulfide}$//[001]$_{α-Fe}$. We also found that the BH and YP-El were affected by the formation of aluminium nitride (AlN) and the annealing temperature.
Starting Page	883
Ending Page	890
Page Count	8
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	16
Issue Number	6
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2010-12-27
Publisher Place	Springer
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	metals deformation precipitation strain aging transmission electron microscopy (TEM) Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Engineering Thermodynamics, Heat and Mass Transfer Magnetism, Magnetic Materials Operating Procedures, Materials Treatment Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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