A method to determine the orientation of the high-temperature beta phase from measured EBSD data for the low-temperature alpha phase in Ti-6Al-4V

Glavicic, M.G.; Kobryn, P. A.; Bieler, T. R.; Semiatin, S. L.

doi:10.1016/s0921-5093(02)00535-x

Cited by 103 publications

(51 citation statements)

References 6 publications

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“…By this means, a <110> fiber texture was predicted for the billet center at which the initial (solidification) texture had been random. Model predictions showed good agreement with the experimental beta texture, whose determination required measurements of the alphaphase texture due to the limited amount of beta phase for Ti-6Al-4V at room temperature [50,51].…”

Section: Taylor Analysismentioning

confidence: 76%

Modeling and Simulation of Texture Evolution During the Thermomechanical Processing of Titanium Alloys (PREPRINT)

Semiatin¹,

Shevchenko²,

Ивасишин³

et al. 2008

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Research Laboratory SPONSORING/MONITORING AGENCY ACRONYM(S) SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RX-WP-TP-2008-4352 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESPaper submitted to the ASM Handbook, Vol. 22-Modeling and Simulation: Processing of Metallic Materials. PAO Case Number: WPAFB 08-5083; Clearance Date: 18 Aug 2008. The U.S. Government is joint author of this work and has the right to use, modify, reproduce, release, perform, display, or disclose the work. Paper contains color. ABSTRACTThe development of crystallographic texture, the preferred orientation of grains in a polycrystalline aggregate, during thermomechanical processing (TMP) can play an important role with regard to the secondary-forming response (e.g., deep drawing of sheet) and service performance (e.g., strength, elastic modulus, ductility, fracture toughness) of metallic materials. Crystallographic texture, or simply texture for succinctness, may arise as a result of large-strain deformation, dynamic/static recrystallization, grain growth, or phase transformation [1]. A second form of anisotropy, mechanical texturing or mechanical fibering, refers to the alignment of microstructure, inclusions, etc., during deformation processes and may also affect mechanical properties such as ductility and fracture toughness. This latter form of texture is not discussed in the present article.

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Section: Taylor Analysismentioning

confidence: 76%

Modeling and Simulation of Texture Evolution During the Thermomechanical Processing of Titanium Alloys (PREPRINT)

Semiatin¹,

Shevchenko²,

Ивасишин³

et al. 2008

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“…Following beta annealing, an alternate method was applied to determine the orientations and hence texture of the underlying beta subgrains/grains for the beta-annealed samples from the measurements for the alpha phase. This method was similar to that developed by Humbert et al [22,23] and Glavicic et al [24,25] For the present technique, however, the quaternion parameterization of orientation space was used in conjunction with average alpha-colony orientations (as described by Pilchak and Williams [26] ) in contrast to the pixel-by-pixel methods employed by the previous researchers. This enabled complete reconstruction of the beta grains in an area measuring 6 mm 9 12 mm (at full resolution) in several minutes.…”

Section: B Experimental Proceduresmentioning

confidence: 99%

Early Stages of Microstructure and Texture Evolution during Beta Annealing of Ti-6Al-4V

Pilchak

Sargent

Semiatin

2017

Metall Mater Trans A

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The early stages of microstructure evolution during annealing of Ti-6Al-4V in the beta phase field were established. For this purpose, a series of short-time heat treatments was performed using sheet samples that had a noticeable degree of alpha-phase microtexture in the as-received condition. Reconstruction of the beta-grain structure from electron-backscatter-diffraction measurements of the room-temperature alpha-phase texture revealed that microstructure evolution at short times was controlled not by general grain growth, but rather by nucleation-and-growth events analogous to discontinuous recrystallization. The nuclei comprised a small subset of beta grains that were highly misoriented relative to those comprising the principal texture component of the beta matrix. From a quantitative standpoint, the transformation kinetics were characterized by an Avrami exponent of approximately unity, thus suggestive of metadynamic recrystallization. The recrystallization process led to the weakening and eventual elimination of the initial beta texture through the growth of a population of highly misoriented grains.

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“…The high-temperature beta grain structure and crystallographic texture were revealed using the MRL-TiBor software package (Materials Resources LLC, Dayton, OH) using a quaternion parameterization of orientation space and average alpha colony orientations to facilitate the calculations as discussed by Pilchak and Williams. [28] This software uses a method similar to that developed by Humbert et al [29,30] and Glavicic et al [31,32] to determine the parent b grain orientations from a group of inherited a variants.…”

Section: Resultsmentioning

confidence: 99%

Thermal Stir Welds in Titanium

Fonda

Knipling

Pilchak

2015

Metall Mater Trans A

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Although conventional friction stir welding (FSW) has proven unsuccessful in joining thick sections of alpha and near-alpha titanium alloys, thermal stir welding, a variant of the FSW process in which an external heat source is used to preheat the workpiece, is demonstrated to be able to reliably join 12.3-mm-thick plates of CP titanium. This paper describes the microstructures and textures that develop in these thermal stir welds. The observed microstructure was used to reconstruct the high-temperature microstructure and texture present during the welding process and therefore reveal the genesis of the welding structures.

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A method to determine the orientation of the high-temperature beta phase from measured EBSD data for the low-temperature alpha phase in Ti-6Al-4V

Cited by 103 publications

References 6 publications

Modeling and Simulation of Texture Evolution During the Thermomechanical Processing of Titanium Alloys (PREPRINT)

Modeling and Simulation of Texture Evolution During the Thermomechanical Processing of Titanium Alloys (PREPRINT)

Early Stages of Microstructure and Texture Evolution during Beta Annealing of Ti-6Al-4V

Thermal Stir Welds in Titanium

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