Analysis of the precipitated phase changes for Super304H heat resistant steel during shot time aging at 800°C

Abstract

For analyzing the change trend of Super304H heat resistant steel steel precipitated phases, this article adopts the method of high temperature aging to simulate the material conditions during actual working environment. Super304H steel aged under 800 °C for short time 10 h, 20 and 30 h. And analyzed SEM morphology, precipitate phase statistics, composition changes of the original sample and the samples after aging. The results showed that the number of precipitated phase increased first, then decreased and then increased with the prolong of aging time, while the average size and area fraction of precipitated phase increased all the time. In the precipitated phase, Cr continued to increase while Ni decreased.