Reverted austenite during aging in 18Ni(350) maraging steel

The evolution of reverted austenite in 18Ni(350) maraging steel was examined using transmission electron microscopy. The types of reverted austenite observed were determined by the aging temperature and time. On aging at 500 and 570 °C, lath-like austenite appears at the prior grain boundaries and t...

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Bibliographic Details
Published in:Materials letters 1995-07, Vol.24 (4), p.239-242
Main Authors: Li, Xiaodong, Yin, Zhongda
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Solid-phase precipitation
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Summary:The evolution of reverted austenite in 18Ni(350) maraging steel was examined using transmission electron microscopy. The types of reverted austenite observed were determined by the aging temperature and time. On aging at 500 and 570 °C, lath-like austenite appears at the prior grain boundaries and the martensite lath-boundaries, but after aging for 4 h at 570 °C, plate-like austenite was observed within the martensite laths. These two types of austenite contain a high density of dislocations. During heating to 640 °C, Widmanstätten austenite forms within the martensite laths along with lath-like austenite at the prior austenite grain boundaries and the martensite lath-boundaries. The formation of the austenite formed at 640 °C appears to be shear dominated but aided by a prior or simultaneous diffusion-controlled process. The orientation relationship of the martensite with the different types of austenite is the Kurdjumov-Sachs (KS) relation.
ISSN:0167-577X
1873-4979
DOI:10.1016/0167-577X(95)00109-3