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J Mater Sci Technol  2009, Vol. 25 Issue (03): 389-394    DOI:
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Investigation of Surface Damage in Forming of High Strength and Galvanized Steel Sheets
Zhongqi Yu1)†, Yingke Hou1), Haomin Jiang2), Xinping Chen2) , Weigang Zhang3)
1) School of Mechanical Engineering, Shanghai Jiao Tong Univ., Shanghai 200240, China
2) Baosteel Technology Center, Baoshan Iron & Steel Co., Ltd, Shanghai 201900, China
3) School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong Univ., Shanghai 200240, China
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Powdering/exfoliating of coatings and scratching are the main forms of surface damage in the forming of galvanized steels and high strength steels (HSS), which result in increased die maintenance cost and scrap rate. In this study, a special rectangular pan was developed to investigate the behavior and characteristics of surface damage in sheet metal forming (SMF) processes. U-channel forming tests were conducted to study the effect of tool hardness on surface damage in the forming of high strength steels and galvanized steels (hot-dip galvanized and galvannealed steels). Experimental results indicate that sheet deformation mode influences the severity of surface damage in SMF and surface damage occurs easily at the regions where sheet specimen deforms under the action of compressive stress. Die corner is the position where surface damage initiates. For HSS sheet, surface damage is of major interest due to high forming pressure. The HSS and hot-dip galvanized steels show improved ability of damage-resistance with increased hardness of the forming tool. However, for galvannealed steel it is not the forming tool with the highest hardness value that performs best.

Key words:  Surface damage      Sheet metal forming      High strength steel      Galvanized steel     
Received:  24 April 2008     

the National Natural Science Foundation of China under grant No. 50605043

Cite this article: 

Zhongqi Yu,Yingke Hou,Haomin Jiang,Xinping Chen,Weigang Zhang. Investigation of Surface Damage in Forming of High Strength and Galvanized Steel Sheets. J Mater Sci Technol, 2009, 25(03): 389-394.

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