Preparation of high-performance ultrafine-grained AISI 304L …
Fig. 1 a shows X-ray profiles for the as-received AISI 304L and samples of AISI 304L milled for 1, 5, 10, 15, 20 and 25 h. Microstructure of the ball-milled specimens consists of a mixture of austenite [γ-phase, face-centred cubic (FCC)] and martensite [α´-phase, body-centred tetragonal (BCT)].