Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Evaluation of the Microstructures and Mechanical Properties on Friction Welded STK400 Tube

마찰접합 된 STK400 Tube의 미세조직과 기계적 특성 평가

  • Kim, Gyeong-Woo (Dept. of Welding and Joining Science Engineering, Chosun University) ;
  • Song, Kuk-Hyun (Dept. of Welding and Joining Science Engineering, Chosun University)
  • 김경우 (조선대학교 용접.접합과학공학과) ;
  • 송국현 (조선대학교 용접.접합과학공학과)
  • Received : 2018.11.07
  • Accepted : 2018.12.05
  • Published : 2019.01.27
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Abstract

We evaluate the properties of friction welded STK400 steel tube in terms of the relationship between microstructures and mechanical properties. Friction welding is conducted at a rotation speed of 1,600 rpm and upset time of 3-7 sec for different thicknesses of STK 400 tubes. To analyse the grain boundary characteristic distributions(GBCDs) in the welded zone, electron backscattering diffraction(EBSD) method is introduced. The results show that a decrease in welding time (3 sec.) creates a notable increase grain refinement so that the average grain size decreases from $15.1{\mu}m$ in the base material to $4.5{\mu}m$ in the welded zone. These refined grains achieve significantly enhanced microhardness and a slightly higher yield and higher tensile strengths than those of the base material. In particular, all the tensile tested specimens experience a fracture aspect at the base material zone but not at the welded zone, which means a soundly welded state for all conditions.

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