Louis G. Hector
General Motors
Ultimate tensile strengthDigital image correlationDeformation (engineering)Strain rateDensity functional theoryDislocationComposite materialChemistryMartensiteMetallurgyMaterials scienceCondensed matter physicsAlloyAluminiumMechanicsNucleationFormabilityPlasticityCrystallographyThermodynamics
241Publications
57H-index
7,754Citations
Publications 238
Newest
#2Yoojin Kim (Brown University)H-Index: 1
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#1Katherine E. Rader (University of Texas at Austin)H-Index: 2
#2Jon T. Carter (GM: General Motors)H-Index: 14
Last. Eric M. Taleff (University of Texas at Austin)H-Index: 23
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A warm forming process with a simultaneous retrogression heat treatment, termed retrogression forming, can achieve good formability in high-strength aluminum alloys and recover their high strength through a single reaging heat treatment after forming. Tensile data from two commercial aluminum alloy sheet materials, AA7075-T6 and AA6013-T6, are presented for conditions suitable to retrogression forming. AA7075-T6 sheet was tested at temperatures from 180 °C to 220 °C and strain rates from 3.2 × 1...
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#1Katherine E. Rader (University of Texas at Austin)H-Index: 2
#2Jon T. Carter (GM: General Motors)H-Index: 14
Last. Eric M. Taleff (University of Texas at Austin)H-Index: 23
view all 4 authors...
Retrogression and reaging (RRA) is of interest to the automotive industry for manufacturing components of high-strength aluminum alloys. RRA heat treatments are investigated for AA7075-T6 and AA6013-T6 materials. Retrogression is demonstrated to be a thermally activated process reasonably characterized with a single activation energy. Activation energies for retrogression are measured as 97 ± 7 and 160 ± 30 kJ/mol for AA7075-T6 and AA6013-T6, respectively. Critical retrogression times, tR* and t...
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#1Katherine E. RaderH-Index: 2
#2Jon T. CarterH-Index: 14
Last. Eric M. TaleffH-Index: 23
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#1Daniel S. Connolly (UW: University of Waterloo)H-Index: 3
#2Christopher P. Kohar (UW: University of Waterloo)H-Index: 9
Last. Kaan Inal (UW: University of Waterloo)H-Index: 26
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Abstract Quenched and Partitioned (QP) steel is a class of Advanced High Strength Steel (AHSS) that exhibits high strength and good ductility. These desirable properties are a consequence of the Transformation Induced Plasticity (TRIP) effect where retained austenite transforms into martensite under applied stress and strain. Accurate microstructural modeling of these advanced deformation mechanisms is critical for automakers to exploit QP steels for automotive weight reduction applications. In ...
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#1Diyar Salehiyan (McMaster University)H-Index: 1
#2Javad Samei (McMaster University)H-Index: 10
Last. David Wilkinson (McMaster University)H-Index: 93
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Quench and partitioning steels offer a valuable combination of high strength and ductility. Here we report on microstructural evolution in a QP980 steel during deformation. This is measured using a range of techniques including in-situ tensile tests coupled with scanning electron microscopy, ex-situ interrupted tensile tests coupled with electron back scattered diffraction, and X-ray diffraction measurements. Microstrain partitioning among ferrite, martensite, and retained austenite is quantifie...
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#1Vesna Savic (GM: General Motors)H-Index: 9
#2Louis G. Hector (GM: General Motors)H-Index: 57
Last. Enloe Charles MH-Index: 5
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#1Z. Li (Brown University)H-Index: 4
#2Ravi Kiran (NDSU: North Dakota State University)H-Index: 15
Last. Allan F. Bower (Brown University)H-Index: 49
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The goal of this paper is to predict how the properties of the constituent phases and microstructure of a transformation induced plasticity steel influence its fracture resistance. The steel selected for study was a three-phase quenched and partitioned (QP) sheet steel comprised of 50% ferrite, 42% martensite and 8% retained austenite (RA) with \(\sim \) 980 MPa tensile strength. Experiments show that ductile fracture in the steel involves nucleation, growth, and coalescence of micron-scale void...
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#1Kristiaan W. Hector (Purdue University)
#2David Restrepo (UTSA: University of Texas at San Antonio)H-Index: 10
Last. Pablo D. Zavattieri (Purdue University)H-Index: 38
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#1Taejoon Park (OSU: Ohio State University)H-Index: 12
#2Louis G. HectorH-Index: 57
Last. Farhang Pourboghrat (OSU: Ohio State University)H-Index: 31
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Abstract A systematic constitutive modeling and calibration methodology were developed based on rate-independent crystal plasticity to predict the quasi static macroscopic behavior of 3rd generation multiphase advanced high strength steels (3GAHSS) prepared with a quenching and partitioning (Q&P) process. In the constitutive law, martensitic phase transformation induced by the elastic-plastic deformation of the retained austenite is represented by considering the Bain strain, the lattice invaria...
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