Martensitic Transformation from Ultrafine Grained Austenite Fabricated by ARB in Fe-24Ni-0.3C

Abstract:

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In this paper, martensitic transformation from ultrafine grained (UFG) austenite fabricated by accumulative roll bonding (ARB) process in a metastable austenite alloy was studied. Microstructural observations and crystallographic analysis were carried out by FE-SEM/EBSD. The results showed that elongated UFG austenite having 200-300 nm in thickness surrounded by high angle boundaries was obtained after 6 cycles of the ARB process. The martensite transformed from the UFG austenite showed characteristic morphology and texture. The martensite transformation starting (Ms) temperature increased after 1 cycle ARB, which is related to increasing amount of nucleation sites, such as low angle boundaries, introduced during early stage of ARB process. In contrast, by increasing the ARB cycles, Ms temperature decreased. Decreasing the Ms temperature could be correlated to strengthening of austenite by the ARB process.

Info:

Periodical:

Materials Science Forum (Volumes 667-669)

Edited by:

Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon

Pages:

361-366

DOI:

10.4028/www.scientific.net/MSF.667-669.361

Citation:

H. Jafarian et al., "Martensitic Transformation from Ultrafine Grained Austenite Fabricated by ARB in Fe-24Ni-0.3C", Materials Science Forum, Vols. 667-669, pp. 361-366, 2011

Online since:

December 2010

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Price:

$35.00

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