TY - JOUR
T1 - The formation mechanism of reverted austenite in Mn-based maraging steels
AU - Qian, Feng
AU - Rainforth, W. Mark
N1 - Publisher Copyright:
© 2019, The Author(s).
PY - 2019/4/30
Y1 - 2019/4/30
N2 - Based on the microstructural evolution in Mn-based maraging steels aged at 460–540 °C, the formation mechanism of reverted austenite is proposed. Reverted austenite formed at grain boundaries at the onset of aging. During further aging, the accumulated Mn enrichment at newly formed α ′ / γ interfaces led to thin austenite layers growing into lath-like austenite grains. The lateral growth of lath-like reverted austenite was sluggish, reflecting the low diffusivity of Mn. We show that reverted austenite formed by a shear-dominated mechanism assisted by a small amount of Mn diffusion, whereas the nucleation of reverted austenite within martensite laths was kinetically slower.
AB - Based on the microstructural evolution in Mn-based maraging steels aged at 460–540 °C, the formation mechanism of reverted austenite is proposed. Reverted austenite formed at grain boundaries at the onset of aging. During further aging, the accumulated Mn enrichment at newly formed α ′ / γ interfaces led to thin austenite layers growing into lath-like austenite grains. The lateral growth of lath-like reverted austenite was sluggish, reflecting the low diffusivity of Mn. We show that reverted austenite formed by a shear-dominated mechanism assisted by a small amount of Mn diffusion, whereas the nucleation of reverted austenite within martensite laths was kinetically slower.
UR - http://www.scopus.com/inward/record.url?scp=85059753003&partnerID=8YFLogxK
U2 - 10.1007/s10853-019-03319-9
DO - 10.1007/s10853-019-03319-9
M3 - Article
AN - SCOPUS:85059753003
SN - 0022-2461
VL - 54
SP - 6624
EP - 6631
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 8
ER -