Microstructure–property relations of a steel powder metal under varying temperatures, strain rates, and stress states

Allison, P. G.; Horstemeyer, M.F.; Hammi, Youssef; Brown, H.R.; Tucker, Matthew T; Hwang, Youngkeun

doi:10.1016/j.msea.2011.09.037

Cited by 18 publications

(7 citation statements)

References 8 publications

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“…All tests were performed on specimens machined from rectangular blanks compacted and sintered by Metaldyne, LLC at a sintered density of 6.35 g/cm^ and 7.05 g/cm^. A detailed explanation of the structure-property experimental procedure may be found in the publication by Allison et al [23].…”

Section: Experimental Procedurementioning

confidence: 99%

“…The fracture toughness, Kyz = 40 MPay^m was obtained from the literature [24]. However, the averages for initial pore radius, pore volume fraction, initial particle size, particle volume fraction, and grain size were determined from microstructural analysis as discussed previously in the manuscript by Allison et al [23]. From image analysis, we quantified the microstructural quantities and the damage parameters from examining the fracture surface of failed specimens and the data are reported in Table 1.…”

Section: Description Of the Modelmentioning

confidence: 99%

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Plasticity and Fracture Modeling/Experimental Study of a Porous Metal Under Various Strain Rates, Temperatures, and Stress States

Allison

Grewal

Hammi

et al. 2013

Journal of Engineering Materials and Technology

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A microstructure-based internal state variable (ISV) plasticity-damage model was used to model the mechanical behavior of a porous FC-0205 steel alloy that was procured via a powder metal (PM) process. Because the porosity was very high and the nearest neighbor distance (NNDj for the pores was close, a new pore coalescence ISV equation was introduced that allows for enhanced pore growth from the concentrated pores. This coalescence equation effectively includes the local stress interaction within the interpore ligament distance between pores and is physically motivated with these highly porous powder metals. Monotonie tension, compression, and torsion tests were performed at various porosity levels and temperatures to obtain the set of plasticity and damage constants required for model calibration. Once the model calibration was achieved, then tension tests on two different notch radii Bridgman specimens were undertaken to study the damage-triaxiality dependence for model validation. Fracture surface analysis was performed using scanning electron microscopy (SEM) to quantify the pore sizes of the different specimens. The validated model was then used to predict the component performance of an automotive PM bearing cap. Although the microstructure-sensitive ISV model has been employed for this particular FC-0205 steel, the model is general enough to be applied to other metal alloys as well.

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Section: Experimental Procedurementioning

confidence: 99%

Section: Description Of the Modelmentioning

confidence: 99%

Plasticity and Fracture Modeling/Experimental Study of a Porous Metal Under Various Strain Rates, Temperatures, and Stress States

Allison

Grewal

Hammi

et al. 2013

Journal of Engineering Materials and Technology

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“…The load frame was equipped with a 50 KN load cell (± 0.4%) while a clip-on extensometer recorded the strain through fracture. Dynamic experiments ( ̇ ) were conducted on a Split-Hopkinson Tension Bar (SHTB) located at the Mississippi State University Center for Advanced Vehicular Systems (MSU-CAVS) as described in [21], [22]. For SHTB testing, the specimens were held by 350-margaging steel grips between 12.7 mm diameter 7075-T6 incident and transmission bars instrumented with semiconductor strain gages.…”

Section: Methodsmentioning

confidence: 99%

Dynamic tensile behavior of electron beam additive manufactured Ti6Al4V

Rodriguez

Allison

Whittington

et al. 2015

Materials Science and Engineering: A

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“…The code uses grayscale gradients to determine the significant properties such as particle size, nearest-neighbor distance, aspect ratio, and volume fraction. The experimental details of the image analysis procedures used can be found elsewhere [18] . The results of the image analyses of an undeformed specimen, a specimen tested at quasi-static strain rate, and a specimen tested at high strain rate help to establish the mechanisms responsible for failure.…”

Section: Microstructure Analysesmentioning

confidence: 99%

Structure-property responses of bio-inspired synthetic foams at low and high strain rates

Rhee¹,

Tucker

Whittington³

et al. 2015

Science and Engineering of Composite Materials

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Various aluminum foams were fabricated with a structure comparable to the Terrapene carolina (box turtle) shell hierarchy as a synthetic means of attaining the lightweight, yet impact-resistive, nature of the biological counterpart. Each foam was constructed from a single aluminum alloy but with different morphologies and foam densities. By borrowing from the sophistication of biological design, the aluminum foams were shown to exhibit robust mechanical performance. High strain rate experimentation, via split Hopkinson pressure bar, was utilized to reveal the strain rate sensitivity of the foams as well as a metric to compare impact performance. The structure-property relations, necessary for accurate material modeling, were also characterized by way of optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and nanoindentation tests. The robust varying mechanical performance was attributed to the biologically inspired materials design.

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Microstructure–property relations of a steel powder metal under varying temperatures, strain rates, and stress states

Cited by 18 publications

References 8 publications

Plasticity and Fracture Modeling/Experimental Study of a Porous Metal Under Various Strain Rates, Temperatures, and Stress States

Plasticity and Fracture Modeling/Experimental Study of a Porous Metal Under Various Strain Rates, Temperatures, and Stress States

Dynamic tensile behavior of electron beam additive manufactured Ti6Al4V

Structure-property responses of bio-inspired synthetic foams at low and high strain rates

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