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FV520B Steel
Steel name: FV520B
Diagram No.: 7668
Type of diagram: CCT
Chemical composition in weight %: 0.062% C, 0.44% Si, 0.67% Mn, 13.37% Cr, 1.44% Mo, 5.33% Ni, 0.29% Nb, 1.46% Cu
Steel group: Stainless steels
Note: Welding continuous cooling transformation of FV520B stainless steel: (a) Case I; (b) Case II. The critical temperature of transformation from pearlite to austenite (Ac1) was 600°C and the
complete transformation temperature of austenite (Ac3) was 900°C. The starting temperature
of the martensite phase transformation (Ms) was 130°C.
The results showed
that the microstructures were all martensite in the designed cooling parameters due to the hardenability
of FV520B stainless steel. For case 1, the microstructure was lath martensite with finely
distributed precipitates. In addition, the proportion of martensite with sparse laths increased
with the increasing cooling rate in the process. For case 2, the microstructure was lath martensite
as well. However, the microstructure of martensite in case 2 was coarser than that of case 1
and dispersedly distributed precipitates were barely observed. As shown,the phase transformation temperature of case 2 was 20°C lower than that of case 1 and both
increased as the cooling rate became higher; the microhardness of case 2 was 60 HV higher
than that of case 1 and both decreased as the increasing cooling rate. In general, the maximum
temperature of thermal cycle had a dominating effect on the microstructure, microhardness and
phase transformation temperature rather than cooling rate.
Reference: Not shown in this demo version.
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