Correlations between nanoindentation hardness and macroscopic mechanical properties in DP980 steels

Taylor, Mark D.; Choi, Kyoo Sil; X, Sun; Matlock, David K.; Packard, Corinne E.; Xu, Le; Barlat, Frédéric

doi:10.1016/j.msea.2013.12.084

Cited by 147 publications

(97 citation statements)

References 32 publications

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“…In hot rolling deformation in austenite temperature region or in the two-phase region results in an increase in dislocation density and deformation bands in ferrite, and elongated structure [48], leading to the increase in YS and UTS [49,50]. In the studied DP steel, the dislocation density in ferrite was low (Fig.…”

Section: 2mentioning

confidence: 87%

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

et al. 2015

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Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt.%) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117. ±. 44. μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90%, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461-623. MPa and a corresponding total elongation in the range of 0.31-0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some isolated cleavage facets, the number of which increased with an increase in martensite fraction. Compared to those of hot rolled DP steels, yield strength and ultimate tensile strength are lower due to large ferrite grain size, coarse martensite area and Widmanstätten ferrite. Abstract: Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt. %) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117±44 μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90 %, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461 -623 MPa and a corresponding total elongation in the range of 0.31 -0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some isolated cleavage facets, the number of which increased with an increase in martensite fraction. Compared to those of hot rolled DP steels, yield strength and ultimate tensile strength are lower due to large ferrite grain size, coarse martensite area and Widmanstätten ferrite. Disciplines Engineering | Science and Technology Studies

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Section: 2mentioning

confidence: 87%

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

et al. 2015

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“…6) Sugimoto et al showed similar results, where lower HER values for a multiphase microstructure were obtained, as compared to a single phase material at the same strength level. 7) Taylor et al also showed that HER decreased with increasing martensite hardness and martensite/ferrite hardness ratio for DP steels, attributing this finding to greater strain partitioning to the ferrite during plastic deformation, which resulted in interface incompatibility and decohesion at ferrite-martensite interfaces. 8) Plastic strain distribution within the microstructure directly affects the fracture behavior during hole expansion.…”

Section: Introductionmentioning

confidence: 96%

Influence of Martensite Morphology on Sheared-Edge Formability of Dual-Phase Steels

2017

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“…the micro-hardness of the M/A constituent is higher than that of the bainitic ferrite matrix, according to previous studies [16,37]; The M/A constituent can act as a mixed hard phase during tension, and hence induce a high degree of plastic deformation of ductile ferrite phase via two-or three-stage work-hardening, according to the mechanism of typical dual-phase steel [38]. Therefore, the overall strain-hardening capacity can be improved by increasing the amount of hard phase [35,38].…”

Section: Effect Of Cooling Rate On the Ts And Yrmentioning

confidence: 57%

Effect of Controlled Cooling on Microstructure and Tensile Properties of Low C Nb-Ti-Containing HSLA Steel for Construction

Yang

Wang

Liu

et al. 2017

Metals

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Abstract:The thermo-mechanical control processing (TMCP) of low carbon (C) Nb-Ti-containing HSLA steel with different cooling rates from 5 to 20 • C/s was simulated using a Gleeble 3500 system. The samples' microstructure was characterized and the tensile properties measured. The results show that a microstructure mainly consisting of quasi-polygonal ferrite (QPF), granular bainitic ferrite (GBF), and martensite/austenite (M/A) constituent formed in each sample. Furthermore, the accelerated cooling led to a significant grain refinement of the QPF and GBF, and an increase in the density of dislocations, as well as suppressed the precipitation of nanoscale particles; however, the overall yield strength (YS) still increased obviously. The accelerated cooling also brought about a decrease in amount of M/A constituent acting as a mixed hard phase, which weakened the overall strain-hardening capacity of the QPF + GBF + M/A multiphase steel and simultaneously elevated yield-to-tensile strength ratio (YR). In addition, the mechanisms in dominating the influence of controlled cooling on the final microstructure and tensile properties were discussed.

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Correlations between nanoindentation hardness and macroscopic mechanical properties in DP980 steels

Cited by 147 publications

References 32 publications

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Influence of Martensite Morphology on Sheared-Edge Formability of Dual-Phase Steels

Effect of Controlled Cooling on Microstructure and Tensile Properties of Low C Nb-Ti-Containing HSLA Steel for Construction

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