An advanced approach to reconstructing parent orientation maps in the case of approximate orientation relations: Application to steels

2012 ◽  
Vol 60 (11) ◽  
pp. 4551-4562 ◽  
Author(s):  
L. Germain ◽  
N. Gey ◽  
R. Mercier ◽  
P. Blaineau ◽  
M. Humbert
Keyword(s):  
Orientation Relations ◽  
Orientation Maps ◽  
Parent Orientation

Determination of parent orientation maps in advanced titanium-based alloys

2007 ◽  
Vol 227 (3) ◽  
pp. 284-291 ◽  
Author(s):  
L. GERMAIN ◽  
S. R. DEY ◽  
M. HUMBERT ◽  
N. GEY
Keyword(s):  
Orientation Maps ◽  
Parent Orientation

The calculation of a parent grain orientation from inherited variants for approximate (b.c.c.–h.c.p.) orientation relations

2002 ◽  
Vol 35 (4) ◽  
pp. 401-405 ◽  
Author(s):  
M. Humbert ◽  
N. Gey
Keyword(s):  
Phase Transformation ◽  
Grain Orientation ◽  
The Body ◽  
Orientation Relation ◽  
Hexagonal Close Packed ◽  
Orientation Relations ◽  
Parent Orientation

The orientations of parent β grains are evaluated from several α variants inherited from the same parent during the body-centred cubic (b.c.c.) to hexagonal close packed (h.c.p.) phase transformation. The proposed calculation, based on orientation correlating and orientation averaging, is particularly useful when the inherited variants are not strictly related to the parent orientation by a strict Burgers orientation relation or when the orientations of the inherited volumes vary slightly at different locations of the variant. This method of parent identification from variant orientations is an improvement of a previously published method.

Back calculation of parent austenite orientation using a clustering approach

2013 ◽  
Vol 46 (1) ◽  
pp. 210-215 ◽  
Author(s):  
V. Tari ◽  
A. D. Rollett ◽  
H. Beladi
Keyword(s):  
Face Centered Cubic ◽  
Orientation Relationships ◽  
New Approach ◽  
Austenite Grain ◽  
Parent Orientation ◽  
Back Calculation ◽  
Clustering Approach ◽  
Face Centered ◽  
Parent Austenite ◽  
Good Agreement

A new approach is presented for calculating the parent orientation from sets of variants of orientations produced by phase transformation. The parent austenite orientation is determined using the orientations of bainite variants that transformed from a single parent austenite grain. In this approach, the five known orientation relationships are used to back transform each observed bainite variant to all their potential face-centered-cubic (f.c.c.) parent orientations. A set of potential f.c.c. orientations has one representative from each bainite variant, and each set is assembled on the basis of minimum mutual misorientation. The set of back-transformed orientations with the minimum summation of mutual misorientation angle (SMMA) is selected as the most probable parent (austenite) orientation. The availability of multiple sets permits a confidence index to be calculated from the best and next best fits to a parent orientation. The results show good agreement between the measured parent austenite orientation and the calculated parent orientation having minimum SMMA.

Shock induced phase change in KCl single crystals: Orientation relations between the B1 and B2 lattices

2009 ◽  
Vol 105 (1) ◽  
pp. 013544 ◽  
Author(s):  
Stefan J. Turneaure ◽  
Y. M. Gupta ◽  
Paulo Rigg
Keyword(s):  
Phase Change ◽  
Single Crystals ◽  
Orientation Relations

scholarly journals Ferrite-to-Austenite and Austenite-to-Martensite Phase Transformations in the Vicinity of a Cementite Particle: A Molecular Dynamics Approach

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 837 ◽  
Author(s):  
Jerome Meiser ◽  
Herbert Urbassek
Keyword(s):  
Molecular Dynamics ◽  
Phase Boundary ◽  
Cementite Particle ◽  
Martensite Phase ◽  
Austenite Phase ◽  
Dynamics Simulation ◽  
Austenitic Transformation ◽  
Orientation Relations ◽  
New Phase ◽  
Crystalline Microstructure

We used classical molecular dynamics simulation to study the ferrite–austenite phase transformation of iron in the vicinity of a phase boundary to cementite. When heating a ferrite–cementite bicrystal, we found that the austenitic transformation starts to nucleate at the phase boundary. Due to the variants nucleated, an extended poly-crystalline microstructure is established in the transformed phase. When cooling a high-temperature austenite–cementite bicrystal, the martensitic transformation is induced; the new phase again nucleates at the phase boundary obeying the Kurdjumov–Sachs orientation relations, resulting in a twinned microstructure.

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