Abstract
Isothermal aging treatments in the temperature range from 550 to 1150 °C for the aging time range from 2 to 2880 min were carried out on 20Cr-24Ni-6Mo super-austenitic stainless steel plates, which were processed by conventional casting and twin-roll strip casting (TRSC). Precipitation behaviors were comparatively studied, from which Time-Temperature-Precipitation (TTP) curves were developed. The results show that two TTP curves basically exhibited C-shapes and each TTP curve was the superposition of sigma and Laves precipitation kinetics curves. When the temperature was higher than about 825 °C, TTP curves were mainly sigma precipitation kinetics curves. On the contrary, TTP curves were mainly sigma and Laves precipitation kinetics curves. Aging temperatures of the precipitation sensitive interval were about in the range from 875 to 1025 °C. The nose temperature of conventional specimen was about 925 °C and the corresponding incubation time was about 2 min. However, the nose temperature of cast strip (CS) specimen was about 950 °C and the corresponding incubation time was about 4 min. TTP curve of CS specimens moved to the upper right as compared to that of conventional specimens, indicating that the precipitation in CS specimens was delayed. By analyzing the compositional distribution in the conventional and CS specimens after solution treatment, it was found that after the completion of solution treatment, the distribution of alloying elements in the CS plate was more homogeneous than that in conventional plate. Therefore, the conventional specimen was more susceptible to the formation of precipitates in aging treatments.
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