Effect of Cooling Rate on Morphology and Crystallography of Lath Martensite in Fe-Ni Alloys

Shigekazu Morito; Ryota Igarashi; Keiichiro Kamiya; Takuya Ohba; Tadashi Maki

doi:10.4028/www.scientific.net/MSF.638-642.1459

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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Effect of Cooling Rate on Morphology and...

Effect of Cooling Rate on Morphology and Crystallography of Lath Martensite in Fe-Ni Alloys

Abstract:

The development of blocks and subblocks in the lath martensite was observed with SEM/EBSD and TEM/Kikuchi diffraction patterns analyses. Morphology of lath martensite formed below Ms temperature was observed using step quenching method in 18 mass% Ni maraging steel. The development of lath martensite structure can be described as follow; lath groups with single K-S variant start to form at the austenite grain boundary. Next, other sub-blocks appear adjacent to the lath groups formed first and these lath groups form macroscopic blocks observed in optical microscopy. The morphologies of the lath martensite in Fe -23 mass% Ni alloy cooled at different cooling rates after austenitization were also observed. The packet size and block thickness decreases with increasing cooling rate, although the sub-block thickness do not change. A packet locally contains small packets with different relationship of close packed planes, and the amount of small packets increases with increasing the cooling rate.

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

1459-1463

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.1459

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Online since:

January 2010

Authors:

Shigekazu Morito, Ryota Igarashi, Keiichiro Kamiya, Takuya Ohba, Tadashi Maki

Keywords:

Crystallography, Lath Martensite, Morpholoy, SEM/EBSD, Steel

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