[논문]3%C-18%Cr-1%Mo-2%Ni-1%Mn 고크롬백주철의 탄화물 및 기지조직에 미치는 불안정화열처리의 영향

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doi:10.3740/mrsk.2003.13.9.581

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3%C-18%Cr-1%Mo-2%Ni-1%Mn high chromium cast iron was casted and destabilized at temperatures of 900, 1000 and $1100^{\circ}C$ for 1, 2, 4 and 8hr under $N_2$atmosphere to observe the effect of destabilization temperature and time on the carbide and matrix structures. In as-cast...

3%C-18%Cr-1%Mo-2%Ni-1%Mn high chromium cast iron was casted and destabilized at temperatures of 900, 1000 and $1100^{\circ}C$ for 1, 2, 4 and 8hr under $N_2$atmosphere to observe the effect of destabilization temperature and time on the carbide and matrix structures. In as-cast condition, the microstructure consisted of $M_{ 7}$$C_3$ carbides and matrix structures which were composed of 91.50% austenite and 8.50% martensite. Numerous fine secondary carbides were observed in the specimens destabilized at $900^{\circ}C$ for 1, 2, 4 and 8hr. But, the number of secondary carbides were much reduced with the increased destabilization temperature. More austenite was formed in the matrix with the higher destabilization temperature. The amounts of austenite in the matrix were 4.23% at $900^{\circ}C$, 29.68% at $1000^{\circ}C$ and 66.51% at$ 1100^{\circ}C$, respectively. However, the effect of destabilization time on the secondary carbide and matrix was very weak compared with that of destabilization temperature. The ranges of the amount of austenite in the matrix from 1hr to 8hr destabilization heat treatment were: 3.95%-4.35% at $900^{\circ}C$, 28.89%-30.15% at $1000^{\circ}C$ and 65.13%-67.12% at $1100^{\circ}C$, respectively. The variation ranges were very narrow. The equilibrium concentration of C and Cr in austenite was already reached within 1hr during destabilization heat treatment. After an attainment of the equilibrium concentration of C and Cr in austenite, no more secondary carbide was precipitated from the matrix.

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가설 설정

4) The effect of destabilization time on the secondary carbide and matrix structure was very weak compared with that of destabilization temperature. The ranges of the amount of austenite in the matrix from 1 to 8 hr destabilization heat treatment were: 3.
3) More austenite was formed in the matrix with the higher destabilization temperature. The amounts of austenite in the matrix were 4.
5) The equilibrium concentration of C and Cr in austenite was already reached within Ihr during destabilization treatment. After an attainment of the equilibrium concentration of C and Cr in austenite, no further more secondary carbide was precipitated from the matrix.

제안 방법

In this research, 3%C-18%Cr니%Mo-2%Ni-l%Mn high chromium cast iron was casted and destabilized at temperatures of 900, 1000 and 1100℃ for 1, 2, 4 and 8 hr under N₂ atmosphere to observe the effect of destabilization temperature and time on the carbide and matrix structures.
The size of specimens used for the destabilization heat treatment was 20 mm0 X 10 mmH. These specimens were destabilized at temperatures of 900, 1000 and 1100℃ for 1, 2, 4 and 8 hr under N₂ atmosphere, and subsequently air cooled to room temperature.

이론/모형

The amount of austenite in the matrix was measured by using a X-ray diffraction method. The areas under the peaks of g(220) and g(3H) were measured for the calculation of the amount of austenite, and those of & (200) and a (220) were measured for the amount of martensite.

성능/효과

But, no pearlite was observed in this study with the addition of 1%Mot 2%Ni and l%Mn. It is reported that Mo, Ni and Mn alloying elements have an effect to move the nose of CCT curve toward longer time and lower temperature!3) Therefore, it can be postulated that on the cooling of 3%C-18%Cr-1 %Mo-2%Ni-1 %Mn high chromium cast iron after solidification, the cooling cui*ve did not pass through the pearlite transformation region. It is also known that Ni and Mn alloying elements decrease Ms temperature greatly.

참고문헌 (14)

W. A. Fairhust and K.Rohring, Foundry Trade Journal, 136 385 (1974)

상세보기
J. D. Watson, P. J. Mutton and I. R. Sare, Metals Fourum, 3, 74 (1980)
K. Yamaguchi and Y. Matsubara, J. of Japan Foundrymens Society(JFS), 62, 43 (1990_
Y. Matsubara, N. Sasaguri and M. Hashimoto in Proceedings of The 4th Asian Foundry Congress(Queensland, Australia, October 1996), ed. K.D.Lakeland, p251
K. Shimizu, N. Sasaguri and Y. Matsubara, Proceedings of The 4th Asian Foundry Congress(Queensland, Australia, October 1996), ed. K. D. Lakeland, p283
Y. Matsubara and N. Sasaguri, J. of Japan Foundry Engineering Society(JFS), 68, 1099 (1996)
Y. Honda and Y. Matsubara, Proceedings of The 5th Asian Foundry Congress(Nanjin, China, September, 1997), ed. G. Sun, p192
S. K. Yu and Y. Matsubara, in Proceedings of The 4th Asian Foundry Congress(Queensland, Australia, October 1996), ed. K. D. Lakeland, p291
K. H. Zum Gahr and G. H. Eldis, Wear, 64, 175 (1980)

상세보기
J. T. H. Pearce, AFS Trans., 92, 599 (1984)
R. S. Jackson, JISI, 208, 163 (1970)
S. K. Yu, KFS Spring Presentation(1994), p115
S. K. Yu and C. R. Loper, AFS Trans., 96, 811 (1988)
C. P. Tong, T. Suzuki and T. Umeda, JFS, 62, 344 (1990)

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[국내논문] 3%C-18%Cr-1%Mo-2%Ni-1%Mn 고크롬백주철의 탄화물 및 기지조직에 미치는 불안정화열처리의 영향
The Effect of Destabilization Heat Treatment on the Carbide and Matrix Microstructures of 3%C-18%Cr-1%Mo-2%Ni-1%Mn High Chromium Cast Iron 원문보기

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[국내논문] 3%C-18%Cr-1%Mo-2%Ni-1%Mn 고크롬백주철의 탄화물 및 기지조직에 미치는 불안정화열처리의 영향 The Effect of Destabilization Heat Treatment on the Carbide and Matrix Microstructures of 3%C-18%Cr-1%Mo-2%Ni-1%Mn High Chromium Cast Iron 원문보기

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[국내논문] 3%C-18%Cr-1%Mo-2%Ni-1%Mn 고크롬백주철의 탄화물 및 기지조직에 미치는 불안정화열처리의 영향
The Effect of Destabilization Heat Treatment on the Carbide and Matrix Microstructures of 3%C-18%Cr-1%Mo-2%Ni-1%Mn High Chromium Cast Iron 원문보기

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