JWJ > Volume 31(6); 2013 > Article
Journal of KWJS 2013 December;31(6) :96-106.
Published online January 21, 2014.
doi:https://doi.org/10.5781/KWJS.2013.31.6.96
Effect of Hot-stamping on Microstructures and Tensile Properties of Al-Si Coated Boron Steel Welds with Laser Source
Myeong-Hwan Oh*, Jong-Pan Kong**, Min-Suck Kwon***, Chung-Yun Kang*
*National Core Research Center, Pusan National University, Busan 609-735, Korea
**Dept. of Material Science and Engineering, Pusan National University, Busan 609-735, Korea
***Hyundai Hysco Co., Ltd. Light weight and Pipe R&D Team, Ulsan 683-806, Korea
Correspondence: Chung-Yun Kang  Email: kangcy@pusan.ac.kr
  Published online January 21, 2014
ABSTRACT
In this study, the effect of laser source(CO2 and Nd:YAG) on the microstructure and tensile properties of laser welded Al-Si coated boron steel(1.2mmt) was investigated with before and after hot-stamping. In case of as welds condition, fracture occurred in base metal unrelated to the laser source. It could be explained that tensile strength of fusion zone composed of martensite and bainite is higher than that of base metal that contains a lot of ferrite despite dilution of Al and Si from coating layer to fusion zone. In case of hot-stamping condition, the fracture occurred in fusion zone irrelevant to laser source and the tensile strength was lower than hot stamped base metal. In the CO2 laser welds, Fe3(Al,Si) formed near the bond line was transformed into ferrite during hot-stamping. Therefore tensile strength of bond line is lower than that of base metal and center of fusion zone and the fracture occurred in the bond line. On the other hand, in the Nd:YAG laser welds, the higher concentration of Al formed the ferrite in the fusion zone during hot-stamping treatment. Also, the thickness of centerline was thinner than that of base metal. Therefore, it is considered that fracture occurred in centerline of fusion zone due to effect of concentration stress, and it leaded to a lower tensile strength and elongation.
Keywords: Al-Si coated layer | CO2 laser | Nd:YAG laser | Hot-stamping | Microstructure | Tensile properties
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