scholarly journals Crystal Plasticity Analysis of Stress Partitioning Mechanisms and Their Microstructural Dependence in Advanced Steels

2015 ◽  
Vol 82 (3) ◽  
Author(s):  
Chao Pu ◽  
Yanfei Gao
Keyword(s):  
Crystal Plasticity ◽  
Lattice Strain ◽  
Martensite Phase ◽  
Geometric Constraints ◽  
High Yield ◽  
Uniaxial Tensile ◽  
Hard Phase ◽  
Ductile Phase ◽  
Strain Evolution ◽  
Stress Partitioning

Two-phase advanced steels have an optimized combination of high yield strength and large elongation strain at failure, as a result of stress partitioning between a hard phase (martensite) and a ductile phase (ferrite or austenite). Provided with strong interfaces between the constituent phases, the failure in the brittle martensite phase will be delayed by the surrounding geometric constraints, while the rule of mixture will dictate a large strength of the composite. To this end, the microstructural design of these composites is imperative especially in terms of the stress partitioning mechanisms among the constituent phases. Based on the characteristic microstructures of dual phase and multilayered steels, two polycrystalline aggregate models are constructed to simulate the microscopic lattice strain evolution of these materials during uniaxial tensile tests. By comparing the lattice strain evolution from crystal plasticity finite element simulations with advanced in situ diffraction measurements in literature, this study investigates the correlations between the material microstructure and the micromechanical interactions on the intergranular and interphase levels. It is found that although the applied stress will be ultimately accommodated by the hard phase and hard grain families, the sequence of the stress partitioning on grain and phase levels can be altered by microstructural designs. Implications of these findings on delaying localized failure are also discussed.

scholarly journals Lattice strain evolution during uniaxial tensile loading of stainless steel

1999 ◽  
Vol 259 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Bjørn Clausen ◽  
Torben Lorentzen ◽  
Mark A.M. Bourke ◽  
Mark R. Daymond
Keyword(s):  
Stainless Steel ◽  
Lattice Strain ◽  
Tensile Loading ◽  
Uniaxial Tensile ◽  
Strain Evolution ◽  
Uniaxial Tensile Loading

Stress-induced phase transformations in thermally cycled superelastic NiTi alloys: in situ X-ray diffraction studies

2015 ◽  
Vol 30 (S1) ◽  
pp. S76-S82 ◽  
Author(s):  
Efthymios Polatidis ◽  
Nikolay Zotov ◽  
Eric J. Mittemeijer
Keyword(s):  
Lattice Strain ◽  
Strain Analysis ◽  
Tensile Loading ◽  
Martensite Phase ◽  
Uniaxial Tensile ◽  
X Ray Diffraction ◽  
X Ray ◽  
Niti Alloys ◽  
Austenite Grains

In situ laboratory-based and in situ synchrotron X-ray diffraction techniques were employed to study quantitatively the strain-induced austenite-to-martensite (A–M) transformation in thermally cycled (TC) superelastic NiTi alloys. The propagation of the A–M interfaces and the evolution of the microstructure were traced during uniaxial tensile loading. It was shown that the TC material exhibits localized transformation via the propagation of transformation bands. The amount of the martensite phase depends approximately linearly on the applied strain. Analysis of the broadening of the austenite diffraction lines indicates the presence of highly deformed austenite grains within the transformation bands. Analysis of the austenite diffraction-line shifts indicates that the overall lattice strain in the (retained) austenite in the transformation bands differs from that of the austenite in the adjacent untransformed regions.

Modeling lattice strain evolution during uniaxial deformation of textured Zircaloy-2

2008 ◽  
Vol 56 (14) ◽  
pp. 3672-3687 ◽  
Author(s):  
F. Xu ◽  
R.A. Holt ◽  
M.R. Daymond
Keyword(s):  
Lattice Strain ◽  
Uniaxial Deformation ◽  
Strain Evolution

scholarly journals Predicting the Tensile Behavior of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si Alloy via the Temperature-Dependent Crystal Plasticity Method

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3138
Author(s):  
Jun Zhang ◽  
Yang Wang ◽  
Peng Wang ◽  
Junhong Chen ◽  
Songlin Zheng
Keyword(s):  
Crystal Plasticity ◽  
Experimental Results ◽  
Uniaxial Tensile ◽  
Published Data ◽  
Initial Yield Stress ◽  
Polycrystal Plasticity ◽  
Different Temperatures ◽  
Polycrystalline Model ◽  
Critical Resolved Shear Stress ◽  
Relationship Of

Uniaxial tensile flow properties of a duplex Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy in a temperature range from 213 K to 573 K are investigated through crystal plasticity modelling. Experimental results indicate that the initial yield stress of the alloy decreases as the temperature increases, while its work-hardening behavior displays temperature insensitivity. Considering such properties of the alloy, the dependence of the initial critical resolved shear stress (CRSS) on temperature is taken into account in the polycrystal plasticity modelling. Good coincidence is obtained between modelling and the experimental results. The determined values of CRSS for slip systems are comparable to the published data. The proposed polycrystalline model provides an alternative method for better understanding the microstructure–property relationship of α + β titanium alloys at different temperatures in the future.

scholarly journals Texture and Lattice Strain Evolution during Tensile Loading of Mg–Zn Alloys Measured by Synchrotron Diffraction

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 124
Author(s):  
Xiaohua Zhou ◽  
Changwan Ha ◽  
Sangbong Yi ◽  
Jan Bohlen ◽  
Norbert Schell ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Basal Slip ◽  
Lattice Strain ◽  
Tensile Loading ◽  
Tensile Tests ◽  
Vital Role ◽  
Prismatic Slip ◽  
Synchrotron Diffraction ◽  
Strain Evolution ◽  
Zn Alloys

To explore the effect of neodymium (Nd) on the deformation mechanisms of Mg–Zn alloys, texture and lattice strain developments of hot-rolled Mg–Zn (Z1) and Mg–Zn–Nd (ZN10) alloys were investigated using in situ synchrotron diffraction and compared with elasto-viscoplastic self-consistent simulation under tensile loading. The Nd-containing ZN10 alloys show much weaker texture after hot rolling than the Nd-free Z1 alloy. To investigate the influence of the initial texture on the texture and lattice strain evolution, the tensile tests were carried out in the rolling and transverse direction. During tension, the {002}<100> texture components develop fast in Z1, which was not seen for ZN10. On the other hand, <100> fiber // loading direction (LD) developed in both alloys, although it was faster in ZN10 than in Z1. Lattice strain investigation showed that <101> // LD-oriented grains experienced plastic deformation first during tension, which can be related to basal slip activity. This was more apparent for ZN10 than for Z1. The simulation results show that the prismatic slip plays a vital role in the plastic deformation of Z1 directly from the beginning. In contrast, ZN10 plastic deformation starts with dominant basal slip but during deformation prismatic slip becomes increasingly important.

In situ compressive investigations on the effects of solid solution Gd on the texture and lattice strain evolution of Mg

2020 ◽  
Vol 774 ◽  
pp. 138938 ◽  
Author(s):  
Yuling Xu ◽  
Yuanding Huang ◽  
Zhengye Zhong ◽  
Sihang You ◽  
Weimin Gan ◽  
...  
Keyword(s):  
Solid Solution ◽  
Lattice Strain ◽  
Strain Evolution

Fracture of Laminated and In Situ Niobium Silicide-Niobium Composites

1996 ◽  
Vol 434 ◽  
Author(s):  
J. D. Rigney
Keyword(s):  
Low Temperatures ◽  
Fracture Resistance ◽  
Fracture Behavior ◽  
High Strain ◽  
Theoretical Models ◽  
High Yield ◽  
Strain Rates ◽  
High Strain Rates ◽  
Ductile Phase

AbstractThe mechanisms contributing to the fracture resistance of refractory metal intermetallic composites containing a BCC metallic phase (niobium) were investigated using model Nb-Si laminates and in situ composites. The controlling influence of ductile phase yield strength and fracture behavior were investigated by varying laminate processing parameters, and/or altering temperatures and applied strain rates during fracture experiments on all materials. The fracture behavior of “ductile” constituents were found to be influenced by phase grain size, solid solution content, constraint (as influenced by interfacial bond strengths), and the testing condition (high strain rates and low temperatures). The measured fracture resistance, when compared to theoretical models, was shown to be controlled by the “toughness” of the “ductile” phase and independent of the fracture behavior promoted (cleavage and ductile). The loss in ductility due to cleavage by high constraint, high strain rates and/or low temperatures was compensated by high yield and cleavage fracture stresses in order to provide a level of toughening similar to that contributed by ligaments which failed with lower yield stresses and greater strains.

Simulation of the Lattice Strains Developed during a Tensile Test on a Multiphase Steel

2005 ◽  
Vol 495-497 ◽  
pp. 1627-1632 ◽  
Author(s):  
Laurent Delannay ◽  
M. Melchior ◽  
Pascal J. Jacques ◽  
Paul van Houtte
Keyword(s):  
Tensile Test ◽  
Crystal Plasticity ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Element Mesh ◽  
Tensile Direction ◽  
Lattice Strains ◽  
Crystal Plasticity Theory ◽  
Two Phases ◽  
Multiphase Steel

This work investigates the micro-mechanics of a multiphase steel sheet during a uniaxial tensile test. Based on crystal plasticity theory, one assesses how the distribution of strain and stress is influenced by the presence of a soft b.c.c. phase and a strong f.c.c. phase. The two phases have been characterized by neutron diffraction. Initial textures are used as input in crystal plasticity simulations. Lattice strains measured in the tensile direction serve to fit hardening parameters. Three modeling hypotheses are tested: the Taylor model assumes uniform strain, the ALAMEL model considers the interaction of pairs of adjacent grains, and a finite element mesh is used to distribute strain and stress over the complete aggregate. The accuracy of each modeling is evaluated based on experimental measurements of the macroscopic stress, the heterogeneity of plastic strain, and the texture development in the two phases.

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