Effect of Solution Treatment Temperature on Trigger Stress for Stress Induced Martensitic Transformation in Ti-10V-2Fe-3Al Alloy

Chen, Wei; Song, Zhenya; Sun, Qiaoyan; Lin, Xin; She, Wenbo; Sun, Jun; Ge, Peng

doi:10.1299/jmmp.4.1296

Cited by 7 publications

(8 citation statements)

References 23 publications

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“…[26] The b phase has a low Mo eq of approximately 7.6 wt pct in the b-ST Ti1023 alloy in the current work. [27] Therefore, SIMT became a dominant deformation mode as the external stress reached a trigger stress of SIMT. The first batch of a¢¢ martensite plates freely nucleated and grew through full grains of the original b parent phase because of their thermodynamically favorable conditions.…”

Section: A Deformation Mode Selectionmentioning

confidence: 99%

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Chen

Sun

Lin

et al. 2011

Metall Mater Trans A

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The microstructural evolution and grain refinement mechanisms of a Ti-10V-2Fe-3Al alloy, b-solution quenched and cold forged (CF) to strains of 0.1, 0.35, and 1.2 have been investigated using optical microscopy (OM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the stress-induced martensitic transformation became a predominant deformation mode in the metastable Ti-10V-2Fe-3Al alloy during cold forging. These martensites a¢¢ repeatedly divided the original b parent phase into a large number of micronsized blocks when the forging strain was 0.1. Shear bands were observed to traverse a¢¢/b lamellae and resulted in a significant grain refinement of the b phase, as the forging strain increased to 0.35. The degree of grain refinement inside shear bands was higher than the outside. Nanocrystalline and amorphous structures were produced in local areas of the original b phase, when the forging strain rose to 1.2. This dramatic grain refinement in the metastable Ti-10V-2Fe-3Al alloy could be attributed to the stress-induced martensitic transformation promoting the initiation and growth of shear bands across a¢¢/b lamellae. More dislocations were produced and accumulated inside grains to accommodate plastic deformation. The crystal structure was collapsed and an amorphous structure was formed as soon as the dislocation density was accumulated to a critical value of 10 14 /cm 2 . Moreover, some of the reverse martensitic phase transformation, a¢¢fib, was observed to contribute to grain refinement of Ti-10V-2Fe-3Al alloy as well.

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Section: A Deformation Mode Selectionmentioning

confidence: 99%

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Chen

Sun

Lin

et al. 2011

Metall Mater Trans A

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“…However, it is essential to acknowledge that future refinements, to improve the computational efficiency, might be made to better align with the observed preferential transformation systems found in these alloys. In a manner akin to what is typically done for NiTi SMA's [23][24][25][26]. At the microscale the transformation systems can be described by the habit plane normal vector m (α) 0 and the shape strain vector b (α) 0 .…”

Section: Discussionmentioning

confidence: 99%

“…The conditions to induced SIM are usually quantified with the trigger stress. This is the point at which SIM is initiated in metastable β titanium alloys [11,12,17,21,23]. Trigger stress was found to rise linearly with logarithmic strain rate [16,25,26].…”

Section: Introductionmentioning

confidence: 94%

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Crystal plasticity based constitutive model for deformation in metastable β titanium alloys

Christie,

Siddiq,

Asim

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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Due to attractive mechanical properties, metastable β titanium alloys have become very popular in many industries including aerospace, marine, biomedical, and many more. It is often the complex interplay among the different deformation mechanisms that produces many of the sought-after properties, such as enhanced ductility, super-elasticity, and shape memory effects. Stress induced martensitic transformation is an important deformation mechanism for these alloys. Understanding of it and the influence it has on the microstructural evolution of materials is of great importance. To this end we have developed a crystal plasticity based constitutive model which accounts for both martensitic phase transformation and slip based plasticity simultaneously in metastable β titanium alloys. We present a new formulation for the evolution of martensite transformation, based on physical principles and crystal plasticity theory. To understand and demonstrate this feature of the model, a parametric assessment of the newly developed constitutive model is conducted. This is followed by first of its kind analyses of stress induced martensitic transformation in metastable β titanium alloys. We firstly present validations against uniaxial loading experiments for different metastable β titanium alloys exhibiting stress induced martensite (SIM) transformation. As part of this, single crystal simulations in metastable β titanium alloys are used for the first time to investigate the interaction of individual transformation systems during unconstrained transformation. This study shows good agreement between the experimental and simulated responses during all stages of deformation in which elastic, transformation and finally the slip stage are exhibited. Relatively “strong” and “weak” orientations for transformation are observed, consistent with experimental studies. The work done here demonstrates the ability of this crystal plasticity finite element method (CPFEM) to capture physical mechanisms while bringing new insight about the interaction of different deformation mechanisms in metastable β titanium alloys.

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“…Material parameters for the two phases used in this study were found by calibrating the model against tensile test results of Ti-1023 alloy at room temperature and at a strain rate of 1 mm/min. As received alloy was heat treated at 700° C for 1 hour and then water quenched [22]. Volume fractions of the phases were found to be 40% and 60% phase [23].…”

Section: Parameter Identificationmentioning

confidence: 99%

Representative volume element (RVE) based crystal plasticity study of void growth on phase boundary in titanium alloys

Asim

Siddiq

Kartal

2019

Computational Materials Science

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Crystal plasticity based finite element method (CPFEM) studies have been successfully used to model different material behaviour and phenomenon, including but not limited to; fatigue, creep and texture evolution. This capability can be extended to include the ductile damage and failure in the model. Ductile failure in metals is governed by void nucleation, growth, and coalescence. High strength titanium alloys can be formed from sheets and components and are prone to ductile failure. α-β Titanium alloys are in widespread use, ranging from aerospace, automotive, energy to oil and gas. They have multiple phases present in the microstructure but α and β phases are dominant and are present in various morphologies. This study focuses on the 3D representative volume element (RVE) simulations of spherical void of known initial porosity at the interface of α and β phase single crystals. The effect of initial porosity, applied triaxiality and orientation of RVE with respect to the loading direction is investigated. Slip based crystal plasticity formulation implemented as a user subroutine in commercially available software was used to simulate the void growth and the results of the same are presented. Lastly, a generalised correlation among loading type, loading direction, crystal orientation, phase interface orientation, and void growth is presented.

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Effect of Solution Treatment Temperature on Trigger Stress for Stress Induced Martensitic Transformation in Ti-10V-2Fe-3Al Alloy

Cited by 7 publications

References 23 publications

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Crystal plasticity based constitutive model for deformation in metastable β titanium alloys

Representative volume element (RVE) based crystal plasticity study of void growth on phase boundary in titanium alloys

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