Microstructure evolution behavior of high chromium heat-resistant steel during creep

Abstract

According to the latest research results, the microstructure evolution behavior of high chromium heat-resistant steel during creep process was summarized and analyzed. Due to the coarsening of M23C6 carbide and Laves phase, the properties of high chromium heat-resistant steel decrease during long-term creep. The stability of high temperature structure can be improved by adjusting element content and improving heat treatment process. The formation of Z-phase is closely related to the consumption of MX-phase, and the nucleation mechanism of Z-phase is still not clear. Therefore, it can provide an effective way to improve the high temperature performance of high chromium heat-resistant steel by generating sufficient amount of MX carbonitrides and maintaining the stability during the long-term creep exposure.