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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