Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Creep life Prediction for W.M. of High Cr-Mo Steel using Modified Power-law

고 Cr-Mo강의 수정멱수법칙을 이용한 W.M. 크리프 수명예측

  • 안종교 (전북대학교 정밀기계공학부) ;
  • 유효선 (전북대학교 정밀기계공학부) ;
  • 양성모 (전북대학교 정밀기계공학부) ;
  • 강희용 (전북대학교 기계설계공학부)
  • Published : 2008.11.01
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Abstract

The high temperature creep properties of the generating plant's high temperature tube, pipe and header and such are very significant in accordance with long-time exposure to the high temperature and pressure environment. Not only this, but as the welding procedure is compulsory for the cohesion of components, the creep properties regarding the local microstructures of steel weldment are very important. In order to understand the creep properties regarding the local microstructures of steel weldment, the SP-Creep test which is easy to get sample from the field component was conducted. The local microstructure of steel weldment, that is, W.M. and B.M.'s microstructures were observed using the SEM. The rupture time of W.M. was longer as 110 % averagely in a same condition, which is the consequence of the difference of the microstructure. Each lethargy coefficient of B.M. and W.M. is evaluated by the relation among the temperature, load and the rupture time from SP-Creep Test. The life estimation equation can be induced by the transformation of Power-law. B.M. and W.M. for each $550\;^{\circ}C$ and $575\;^{\circ}C$, the very similar to normal temperature of the domestic thermal power generation in working, are estimated.

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References

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