Effect of martensite volume fraction and its morphology on the tensile properties of ferritic ductile iron with dual matrix structures

Kocatepe, Kadir; Cerah, M.; Erdoğan, Mehmet

doi:10.1016/j.jmatprotec.2005.11.019

Cited by 31 publications

(12 citation statements)

References 12 publications

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“…The size of martensite regions also affects the strength [16]. Large size of martensite regions is harmful to mechanical properties, due to a decrease in geometrically necessary dislocations and effective barriers to dislocation motion in ferrite [16,[40][41][42]. In addition, the size distribution of martensite regions was not homogeneous, as shown in Figs.…”

Section: 2mentioning

confidence: 99%

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: 99%

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

et al. 2015

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“…The reported values of Young's moduli for similar DP steels are in the range of 170-210 GPa [102][103][104]. Furthermore, tensile yield strengths have been reported in the range of 345-482 MPa [24,[105][106][107], 413-622 MPa [24,106,108,109], and 520-670 MPa [110][111][112][113] for the intercritical annealing temperatures of 750 • C, 780 • C, and 810 • C, respectively. Considering a scaling factor of 2 (see Patel et al [97]) for converting indentation yield strength to the tensile yield strength, the values reported in Table 2 are in good agreement with the values reported in the literature.…”

Section: Microindentation and Resultsmentioning

confidence: 99%

New Insights into the Microstructural Changes During the Processing of Dual-Phase Steels from Multiresolution Spherical Indentation Stress–Strain Protocols

Khosravani

Caliendo

Kalidindi

2019

Metals

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In this study, recently established multiresolution spherical indentation stress-strain protocols have been employed to derive new insights into the microstructural changes that occur during the processing of dual-phase (DP) steels. This is accomplished by utilizing indenter tips of different radii such that the mechanical responses can be evaluated both at the macroscale (reflecting the bulk properties of the sample) and at the microscale (reflecting the properties of the constituent phases). More specifically, nine different thermo-mechanical processing conditions involving different combinations of intercritical annealing temperatures and bake hardening after different amounts of cold work were studied. In addition to demonstrating the tremendous benefits of the indentation protocols for evaluating the variations within each sample and between the samples at different material length scales in a high throughput manner, the measurements provided several new insights into the microstructural changes occurring in the alloys during their processing. In particular, the indentation measurements indicated that the strength of the martensite phase reduces by about 37% when quenched from 810 • C compared to being quenched from 750 • C, while the strength of the ferrite phase remains about the same. In addition, during the 10% thickness reduction and bake hardening steps, the strength of the martensite phase shows a small decrease due to tempering, while the strength of the ferrite increases by about 50% by static aging.

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“…It is well known that the smaller the graphite, the better the mechanical properties of ductile cast iron in a certain range. Therefore, the size and distribution of graphite play an important role in improving mechanical properties of ductile cast iron [17][18][19] . Generally, graphite with a diameter greater than 50 µm emerges in liquid areas in traditional ductile cast iron according to the Fe-C phase diagram [12] .…”

Section: Refinement Of Graphite and Niobiummentioning

confidence: 99%

Refinement and fracture mechanisms of as-cast QT700-6 alloy by alloying method

Gao

et al. 2017

China Foundry

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Effect of martensite volume fraction and its morphology on the tensile properties of ferritic ductile iron with dual matrix structures

Cited by 31 publications

References 12 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

New Insights into the Microstructural Changes During the Processing of Dual-Phase Steels from Multiresolution Spherical Indentation Stress–Strain Protocols

Refinement and fracture mechanisms of as-cast QT700-6 alloy by alloying method

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