Texture evolution during high strain-rate compressive loading of maraging steels produced by laser powder bed fusion

High-temperature compression and electron backscatter diffraction (EBSD) techniques were used in a systematic investigation of the dynamic recrystallization (DRX) behavior and texture evolution of the Inconel625 alloy. The true stress–true strain curves and the constitutive equation of Inconel625 were obtained at temperatures ranging from 900 to 1200 °C and strain rates of 10, 1, 0.1, and 0.01 s−1. The adiabatic heating effect was observed during the hot compression process. At a high strain rate, as the temperature increased, the grains initially refined and then grew, and the proportion of high-angle grain boundaries increased. The volume fraction of the dynamic recrystallization increased. Most of the grains were randomly distributed and the proportion of recrystallized texture components first increased and then decreased. Complete dynamic recrystallization occurred at 1100 °C, where the recrystallized volume fraction and the random distribution ratios of grains reached a maximum. This study indicated that the dynamic recrystallization mechanism of the Inconel625 alloy at a high strain rate included continuous dynamic recrystallization with subgrain merging and rotation, and discontinuous dynamic recrystallization with bulging grain boundary induced by twinning. The latter mechanism was less dominant.

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102 Dynamic deformation behavior of rubber under high strain rate compressive loading

The Proceedings of the JSME Materials and Processing Conference (M&P) ◽

10.1299/jsmeintmp.10.1.24 ◽

2002 ◽

Vol 10.1 (0) ◽

pp. 24-29

Author(s):

Ouk Sub Lee ◽

Myun Soo Kim ◽

Si Won Hwang ◽

Kyu Sang Cho

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

Deformation Behavior ◽

High Strain ◽

Dynamic Deformation ◽

Compressive Loading ◽

Dynamic Deformation Behavior

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Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion

Materials ◽

10.3390/ma13132902 ◽

2020 ◽

Vol 13 (13) ◽

pp. 2902 ◽

Cited By ~ 1

Author(s):

Xiaoyang Liu ◽

Keito Sekizawa ◽

Asuka Suzuki ◽

Naoki Takata ◽

Makoto Kobashi ◽

...

Keyword(s):

Strain Rate ◽

Lattice Structure ◽

Unit Cell ◽

Lattice Structures ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Compressive Properties ◽

Powder Bed ◽

Unit Cells ◽

Indentation Tests

In the present study, in order to elucidate geometrical features dominating deformation behaviors and their associated compressive properties of lattice structures, AlSi10Mg lattice structures with three different unit cells were fabricated by laser powder bed fusion. Compressive properties were examined by compression and indentation tests, micro X-ray computed tomography (CT), together with finite element analysis. The truncated octahedron- unit cell (TO) lattice structures exhibited highest stiffness and plateau stress among the studied lattice structures. The body centered cubic-unit cell (BCC) and TO lattice structures experienced the formation of shear bands with stress drops, while the hexagon-unit cell (Hexa) lattice structure behaved in a continuous deformation and flat plateau region. The Hexa lattice structure densified at a smaller strain than the BCC and TO lattice structures, due to high density of the struts in the compressive direction. Static and high-speed indentation tests revealed that the TO and Hexa exhibited slight strain rate dependence of the compressive strength, whereas the BCC lattice structure showed a large strain rate dependence. Among the lattice structures in the present study, the TO lattice exhibited the highest energy absorption capacity comparable to previously reported titanium alloy lattice structures.

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Texture evolution in high strain rate deformed Cu–10Zn alloy

Materials Science and Engineering A ◽

10.1016/j.msea.2012.07.112 ◽

2012 ◽

Vol 558 ◽

pp. 761-765 ◽

Cited By ~ 7

Author(s):

N.P. Gurao ◽

Rajeev Kapoor ◽

Satyam Suwas

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

Texture Evolution

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Electro-Hydraulic Forming of Advanced High-Strength Steels: Deformation and Microstructural Characterization

ASME 2012 International Manufacturing Science and Engineering Conference ◽

10.1115/msec2012-7322 ◽

2012 ◽

Author(s):

Aashish Rohatgi ◽

Elizabeth V. Stephens ◽

Danny J. Edwards ◽

Mark T. Smith ◽

Richard W. Davies

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

Numerical Models ◽

Texture Evolution ◽

High Strength ◽

High Rate ◽

Deformation History ◽

Conical Die ◽

History Of

The deformation behavior and texture evolution during forming of an advanced high-strength steel (DP600 grade) were characterized. The deformation history of DP600 during electro-hydraulic forming (EHF) was quantified using a unique experimental capability developed at PNNL. The texture evolution during quasi-static and high-strain-rate deformation was determined using the electron backscatter diffraction (EBSD) technique. The deformation history of EHF formed steel sheets shows an amplification of the strain-rate, relative to free-forming conditions, when the forming was carried out inside a conical-die. This strain-rate amplification was attributed to the focusing action of the conical die. The undeformed DP600 sheet was found to possess a {111} fiber texture in the sheet-normal direction. Quasi-static deformation was found to strengthen the pre-existing texture whereas high-rate forming using EHF had a lesser influence. The results of this work demonstrate the unique capability to correlate deformation history during high-strain-rate metal forming processes with the corresponding microstructural evolution. It is expected that results of this work can help fill-in the gaps in our understanding of high-rate forming processes, leading to development of accurate and validated numerical models.

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