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- W4254661938 abstract "The mechanisms governing the reverse martensite (α′) to austenite (γ) transformation (α′ → γ) and the effect of prior precipitation on the austenite reversion are investigated for martensitic Fe–Mn alloys containing 5 and 10 wt.% Mn and their age-hardenable variants with the addition of 1 wt.% Pd, respectively. Dilatometric experiments employing heating rates between 0.5 and 200 K min−1, atom-probe tomography measurements on continuously heated specimens and thermo-kinetic simulations were performed. On fast heating (200 K min−1), the α′ → γ transformation appeared in a single stage and can be regarded as a partitionless and interface-controlled reaction. In comparison to the binary alloys, the transformation temperatures of the Pd-containing steels are considerably increased, due to precipitates which act as obstacles to migrating austenite/martensite interfaces. For low heating rates of 0.5 and 2 K min−1, splitting of the α′ → γ transformation into two consecutive stages is observed for both the binary and the ternary alloys. With the assistance of thermo-kinetic simulations, a consistent description of this phenomenon is obtained. The first transformation stage is associated with the decomposition of the martensite matrix into Mn-rich and Mn-deficient regions, and the austenite formation is dominated by long-range diffusion. In the second stage, the austenite reversion mechanism changes and the Mn-depleted regions transform in a predominantly interface-controlled mode. This is corroborated by the results for the ternary alloys. The precipitates mainly impede the austenite formation in the second stage, which occurs over a considerably wider temperature range compared to the binary alloys." @default.
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- W4254661938 date "1986-03-01" @default.
- W4254661938 modified "2023-10-16" @default.
- W4254661938 title "The mechanics of low-temperature lattice changes of martensite with abnormal tetragonality. Part I. Martensite with abnormally low tetragonality" @default.
- W4254661938 doi "https://doi.org/10.1016/0036-9748(86)90146-8" @default.
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