Crystallographic Features of Martensite Transformed from Ultrafine Grained Austenite Fabricated by Severe Plastic Deformation

Akinobu Shibata; Hamidreza Jafarian; Daisuke Terada; Nobuhiro Tsuji

doi:10.4028/www.scientific.net/MSF.706-709.1835

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Crystallographic Features of Martensite...

Crystallographic Features of Martensite Transformed from Ultrafine Grained Austenite Fabricated by Severe Plastic Deformation

Abstract:

We studied the crystallographic features, especially the orientation relationship with respect to austenite, of martensite in a steel transformed from coarse-grained equiaxed austenite (35 μm), ultrafine-grained equiaxed (2.5 μm) or lamellar (300nm) austenite fabricated by sever plastic deformation. With decreasing the grain size of equiaxed austenite, the orientation relationship changed from Kurdjumov - Sachs relationship to Greninger - Troiano relationship. We inferred that this change of orientation relationship could be attributed to the small size of martensite plate transformed from the ultrafine-grained equiaxed austenite. The martensite transformed from the ultrafine-grained lamellar austenite did not have a definite orientation relationship with austenite. We considered that a high density of dislocations or a high density of low angle boundaries within the ultrafine lamellar austenite grain resulted in the large deviation of orientation relationship.

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Materials Science Forum (Volumes 706-709)

Pages:

1835-1840

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.1835

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Online since:

January 2012

Authors:

Akinobu Shibata, Hamidreza Jafarian, Daisuke Terada, Nobuhiro Tsuji

Keywords:

Martensite, Orientation Relationship, Steel, Ultrafine-Grained Structure

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