Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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The Effect of High Velocity Oxygen Fuel Thermal Spray Coating on Fatigue Crack Growth Behavior for Welded SM490B

SM490B 용접부의 피로균열 성장 거동에 미치는 초고속 용사코팅 효과

  • Yoon, Myung-Jin (School of Mechanical & Automotiv Engineering, Kyungil University) ;
  • Choi, Sung-Jong (School of Mechanical & Automotiv Engineering, Kyungil University) ;
  • Cho, Won-Ik (School of Mechanical & Automotiv Engineering, Kyungil University)
  • 윤명진 (경일대학교 기계자동차학부) ;
  • 최성종 (경일대학교 기계자동차학부) ;
  • 조원익 (경일대학교 기계자동차학부)
  • Published : 2006.07.01
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Abstract

High velocity oxygen-fuel thermal spray coating of the WC-Co cermet material is a well-established process for modifying the surface properties of the structural components exposed to the corrosive and wear attacks, and also these coating are well-known method to improve the fatigue strength of material. In this study, HVOF coated SM490B are prepared to evaluation of the effect of coating on tension and fatigue crack growth behavior. The pre-crack of the fatigue crack growth test specimens machined at deposited material area, heat affected zone and boundary, respectively. Through these test, the following results are obtained: 1) Tensile strength was about 498 MPa, and fracture occurred on base metal area. 2) The fatigue crack of coated specimens propagated more rapidly than non-coated specimen in all specimens. 3) In the same coating thickness specimens, the specimens with pre-crack at boundary more rapidly propagated than the specimens with pre-crack at HAZ and deposited material area. These results can be used as basic data in a structural integrity evaluation of rolled SM490B weldments considering HVOF coating.

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References

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