›› 2012, Vol. ›› Issue (03): 656-659.

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Effect of welding speed on microstructure and micro hardness of the weld seam of laser welded ultra-high strength steel

GU Zheng-wei1, YU Si-bin1, HAN Li-jun2, MENG Jia1, SHEN Yong-bo1, XU Hong1   

  1. 1. College of Materials Science and Engineering, Jilin University, Changchun 130022, China;
    2. FAW-Volkswagen Automotive Company Ltd., Changchun 130042, China
  • Received:2011-03-17 Online:2012-05-01

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Abstract: Based on the experiments of laser welded ultra-high strength steel with thickness of 1.8 mm, the effects of the welding speed on microstructure and microhardness of the weld seam were studied. The results showed that microstructures of the weld seam are the lathy martensites. The picric acid solution was used to display the boundary of the prior austenite grain, and the grain exhibits the columnar crystals. With the increase of the welding speed, the grain sizes of the prior austenite decrease and the fine cellular dendrites in the center of the weld seam change into the equiaxed grains. The microhardness of the weld seam increases with the welding speed.

Key words: materials synthesis and processing technology, ultra-high strength steel, laser welding, welding speed, microstructure, micro hardness

CLC Number: 

  • TG456.7
[1] Merklein M,Lechler J. Investigation of the thermo-mechanical properties of hot stamping steels［J］. Materials Processing Technology,2006,177(1/3):452-455.
[2] 于鸣,于思彬. 超高强度钢激光焊接的微观组织与断口分析［J］. 吉林大学学报:工学版,2010,40(增刊):239-242. Yu Ming,Yu Si-bin. Analysis of microstructure and fracture of laser welding of ultra-high strength steel［J］. Journal of Jilin University (Engineering and Technology Edition),2010,40(Sup.):239-242.
[3] Kolleck R,Veit R. Investigation on induction heating for hot stamping of boron alloyed steels［J］. CIRP Annals-Manufacturing Technology,2009,58(1):275-278.
[4] Mei Li-fang,Chen Gen-yu,Jin Xiang-zhong. Research on laser welding of high-strength galvanized automobile steel sheets［J］. Optics and Lasers in Engineering,2009,47(11):1117-1124.
[5] 王英. 船体用钢奥氏体晶粒度显示方法［J］. 理化检验物理分册,2008,44(7):359-361. Wang Ying. Research on the display of austenitic grain for hull steel［J］. PTCA (Part: A Phys. Test.),2008,44(7):359-361.
[6] 张文钺. 焊接冶金学(基本原理)［M］. 北京:机械工业出版社,1999.
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