Effect of Deformation Conditions on Strain-Induced Precipitation of 7Mo Super-Austenitic Stainless Steel

Strain-induced precipitation (SIP) behaviors of 7Mo super-austenitic stainless steel (SASS) under various deformation conditions were studied by stress relaxation tests. The research demonstrates that sigma phases are the primary SIP SASS. Generally, is mainly distributed in granular shape at boundaries deformed grains or recrystallized grains, as well around microstructure, such twin layers/matrix interfaces. variation parameters can lead to changes therefore influencing distribution SIP. For instance, with temperature increases, gradually evolves from grain boundaries. average size increases increasing and strain, decreasing strain rate. content also rate, while exhibiting an initial rise followed a decline temperature, reaching its maximum value 850 °C. presence promote recrystallization particle-induced nucleation (PSN) mechanism during hot process. Moreover, these serve sites for SIP, promoting This process be simplified SIP→PSNRecrystallization→Nucleation sitesSIP. With increase holding time consumption stored energy, slows down, leading formation multi-layer structure, namely SIPs/Recrystallized grains/SIPs structure. hinder growth grains. Through this study, comprehensive understanding SASS different has been achieved, interaction between recrystallization. finding provides valuable insights effective control regulation optimizing working processes