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Behavior of Reverted Austenite in Fe-Ni-Mn-(Ti) Maraging Steels
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1993, v.6 no.1, pp.141-147
Kim,
S.
(1993). Behavior of Reverted Austenite in Fe-Ni-Mn-(Ti) Maraging Steels. Analytical Science and Technology, 6(1), 141-147.
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Abstract
The behavior of reverted austenite in Fe-Ni-Mn(Ti) maraging steels has been investigated in the temperature range from <TEX>$400^{\circ}C$</TEX> to <TEX>$550^{\circ}C$</TEX> using TEM equipped with EDX. Four kinds of reverted austenite appeared depending on the aging temperatures and time : Widmanstatten, granular, lath-like and recrystallized austenite. The reverted austenites are enriched in Ni and Mn due to the dissolution of precipitates and redistribution of alloying elements. Widmanstatten austenite appears unformly in the lath martensite having the K-S orientation relationship with the martensite lath, while lath-like martensites showed K-S and N relations depending on the chemistry and heat treating condition. The recrystallized austenite forms at <TEX>$550^{\circ}C$</TEX> after long aging times : some becomes unstable and transforms to lath martensite on cooling.
- keywords
- maraging steel, reverted austenites, precipitates, orientation relationship
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