Yu, Ping JuiPing JuiYuTsao, Tzu ChingTzu ChingTsaoHsu, Cheng AnCheng AnHsuGan, Neng HaoNeng HaoGanWang, Shing HoaShing HoaWangJER-REN YANGChang, Horng YiHorng YiChangChung, Tsai FuTsai FuChung2023-05-232023-05-232023-03-012075-4701https://scholars.lib.ntu.edu.tw/handle/123456789/631323A novel dual-phase PHSS consisting of lath martensite plus allotriomorphic δ ferrite (ALF) with nanoprecipitates was characterized by high-resolution field emission transmission electron microscopy for quenched, solid-solution-treated, and aged stainless steel. The effects of aging at various durations prior to H2O or liquid N2 quenching were investigated. Cu-rich nanoprecipitates evolve from body-centered cubic clusters to 9R Cu under quenching to 3R Cu and subsequently to face-centered cubic ε-Cu at various aging durations. Maximum hardness was observed after aging at 600 °C for 1 h. However, after this aging, both reversed austenite and Cu-rich nanoprecipitates coexisted in the martensite matrix. The segregation and diffusion of austenite-stabilizing elements promoted the nucleation of reversed austenite.allotriomorphic δ ferrite (ALF) | Cu-rich nanoprecipitates | dual phases | precipitation-hardened stainless steeljournal article10.3390/met130306252-s2.0-85152677514WOS:000960364700001https://api.elsevier.com/content/abstract/scopus_id/85152677514