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JWJ > Volume 33(3); 2015 > Article
Journal of Welding and Joining 2015 June;33(3) :54-61.
Published online June 30, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.3.54
Effects of laser power on hardness and microstructure of the surface melting hardened SKD61 hot die steel using Yb:YAG disk laser
Kwang-Hyeon Lee*, Seong-Won Choi**, Chung-Yun Kang**
*Busan Laser Application Support Center, Korea Institute of Machinery & Materials, Busan 618-230, Korea
**Dept. of Material Science and Engineering, Pusan National University, Busan 609-735, Korea
Correspondence: Chung-Yun Kang  Email: kangcy@pusan.ac.kr
  Published online June 30, 2015
ABSTRACT
In this study, effect of laser power on hardness and microstructure of SKD61 Hot Die steel of which surface was melted and hardened with Yb:YAG disk laser was investigated. Beam speed was fixed at 70 mm/sec and distance between them was 0.8 mm about Laser surface melting. The only thing that was changed laser power. Laser powers were 2.0, 2.4 and 2.8 kW. No defect was found under all conditions. As the laser power increased, the penetration depth were deepened and the bead width was also widened. There was no hardness deviation of fusion zone at same laser power and it was higher than that of heat affected zone. In addition, the more laser power increased, the more hardness in fusion zone decreased. Fusion zone was macroscopically dendrite structure. However, core matric in dendrite was lath martensite of 100 nm size. There were M23C6 of 500 nm and the VC and Mo2C of a nano meters on boundary of dendrite.
Keywords: Laser hardening | Yb:YAG disk laser | SKD61 | Laser surface melting | High power disk laser
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