Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
권호 표지

Effect of Forging Condition on the Microstructure and Mechanical Properties in Centrifugal Casted Heat Resistant Steel

원심주조된 내열강의 미세조직 및 기계적성질에 미치는 단조 조건의 영향

  • Published : 2009.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

The effect of forging start temperature, forging ratio on the microstructure and mechanical properties of B7B4 steel ware investigated. Microstructure of centrifugal casted B7B4 steel consisted of martensite and ferrite phase. The volume fraction of ferrite increased with increase of forging start temperature and decreased with increase of forging ratio. Tensile strength and hardness decreased with higher of forging start temperature, while impact value and elongation increased with higher of forging start temperature. With increase of forging ratio, tensile strength rapidly increased up to the forging ratio of 30%, and then slowly increased, but elongation was decreased. Hardness and impact value rapidly increased with increase of forging ratio.

Keywords

References

  1. 吉田豊明,1995, "ガスタ-ビン機關の超高溫材料技術についで",耐熱金屬材料, 第123會 硏究報告 Vol.36,No.3,p.275
  2. 강창룡 외 4인, 2000 , "발전플랜트용 10Cr 페라이트 내열강의 라베스상 석출거동 및 기계적 성질", 한국동력기계공학회지, 제 6권, 제 1 호, pp. 1-7
  3. N. F. Vildamova et al., 1994, "Creep Behavior and srtucture of high chromium ferriteMartensite steels", The physics of metal's and metallography, Vol. 77, No.6 pp. 670-675.
  4. 겸재성, 2008 , "원심주조된 내열강의 미세조직 및 기계적 성질에 미치는 단조조직의 영향"부경대학교 공학석사 학위논문.
  5. R. C. Thomson and H. K. D. H Bhadeshia, 1992, "Carbide precipitartion in 12Cr 1Mo V power plant steel ", metallurgical transaction A, Vol. 23A, p. 1171.
  6. S. Yoshiatsu et al., 1995, "Development of high strength 12%Cr steel pipe and tube for boilers", sumitomo kinjoku, Vol. 47, No.4, p. 29.