ISSN:
1573-8973
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. The stability of δ-ferrite in steel 09Kh16N4BL, which is disposed along the boundaries of the dendrite cells, is determined by the liquation of chromium during crystallization. The liquation of chromium to 17.5% with 3% of Ni is sufficient for the formation of stable δ-ferrite. 2. As the castingscool, the chromium and nickel contents in the δ-ferrite increase and decrease, respectively, in the interval of the δ→γ-transformation immediately after crystallization in conformity with the Fe−C−Cr−Ni constitution diagram; this contributes to an evengreater improvement in its stability. 3. The final chemical microinhimogeneity in terms of chromium and nickel is determined by the cooling rate during the final δ→γ-transformation in the 1400–1100°C interval. 4. For specimens cast at a low cooling rate (1 deg/sec), heating to 1200–1300°C leads to a reduction in chemical microinhomogeneity during subsequent cooling in water (40 deg/sec), and has virtually no effect on it at a low cooling rate (0.5 deg/sec). After heating to 1300°C, the chemical microinhomogeneity increases for specimens cast at a high cooling rate (103 deg/sec), while for specimens cast at a low cooling rate (0.5 deg/sec), it corresponds to the initial level observed in specimens cast at a cooling rate of 1 deg/sec.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00701065
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