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2019 Vol.29, Issue 1 Preview Page
Evaluation of the Microstructures and Mechanical Properties on Friction Welded STK400 Tube

마찰접합 된 STK400 Tube의 미세조직과 기계적 특성 평가

Gyeong-Woo Kim
,
Kuk-Hyun Song†
김 경우
,
송 국현†
Dept. of Welding and Joining Science Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea
조선대학교 용접·접합과학공학과
†Corresponding author E-Mail : skhyun7@chosun.ac.kr (K.-H. Song, Chosun Univ.)
January 2019. pp. 30-36
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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 μm in the base material to 4.5 μm 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.

Keywords
friction welding
STK 400 tube
electron backscattering diffraction(EBSD)
microstructure
mechanical properties
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 29
  • No :1
  • Pages :30-36
  • Received Date : 2018-11-07
  • Revised Date : 2018-12-05
  • Accepted Date : 2018-12-05
  • DOI :https://doi.org/10.3740/MRSK.2019.29.1.30
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