The Role of Silicon in the Solidification of High-Cr Cast Irons

Bedolla-Jacuinde, A.; Rainforth, W. M.; Mejı́a, I.

doi:10.1007/s11661-012-1434-8

Cited by 28 publications

(6 citation statements)

References 43 publications

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“…It has been shown that the decomposition of SiC starts at 610 o C, then silicon diffuses into the lattice of iron to alloy with iron. The diffusion of silicon tends to de-stabilize γ-Fe and hinder the phase transformation of α-Fe → γ-Fe, raising the phase transformation temperature [34]. When the atomic percent of Si is above 3.8 at%, there is no phase transformation from -Fe to -Fe.…”

Section: Characterizationmentioning

confidence: 99%

Study of spark plasma sintered nanostructured ferritic steel alloy with silicon carbide addition

Ning

2016

Materials Science and Engineering: A

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Pure nanostructured ferritic steel alloy (NFA) and NFA-silicon carbide (SiC) composites with different compositions (97.5 vol% NFA-2.5 vol% SiC and 95 vol% NFA-5 vol% SiC) have been sintered by spark plasma sintering (SPS) and systematically investigated based on XRD, SEM, density, Vickers hardness, and nano-hardness. Minor γ-Fe phase formation from the main α-Fe matrix occurs in pure NFA between the sintering temperature of 950°C and 1000 o C. However, this is hindered in the NFA-SiC composite sintering. Densities for both the pure NFA and the NFA-SiC composites increase with the sintering temperature but decrease with the SiC content. The NFA-SiC composites have higher porosity than pure NFA under the same sintering condition. All the samples have the average grain sizes between 6 µm and 8 µm. Vickers hardness of the pure NFA and NFA-SiC composites is related to density and phase composition. By estimation, the 97.5 vol% NFA-2.5 vol% SiC composite sample has the maximum yield strength of 3.14±0.18 GPa. Nano-hardness of the NFA-SiC composite is degraded by diffusion and reaction between NFA and SiC. The addition of SiC decreases the elastic modulus of the NFA-SiC composites.

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Section: Characterizationmentioning

confidence: 99%

Study of spark plasma sintered nanostructured ferritic steel alloy with silicon carbide addition

Ning

2016

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

“…High‐Cr white cast irons are ferrous alloys containing Cr contents in the range of 11–30% and C in the range of 1.8–3.6% . The typical microstructure of these alloys is that high‐volume fraction of hard carbides (primary and/or eutectic M 7 C 3 where mL includes Cr, Fe, and other strong carbide formers), with a hardness of 1200–1800 HV, embed in a relatively ductile ferrous matrix . On one hand, the presence of hard carbides results in outstanding wear resistance so that high‐Cr white cast irons are widely used in applications where the stability in an aggressive environment is a principal requirement, such as mining and mineral processing, slurry pumping, cement manufacturing, and steel making industries .…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Hot Deformation Behavior of High‐Cr White Cast Iron and High‐Cr White Cast Iron/Low Carbon Steel Laminate

Gao

Jiang

et al. 2015

steel research int.

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In order to study the plastic deformation characteristics of the brittle high-Cr white cast iron in upsetting process, and find out the mechanism for improving the formability of the cast iron within the laminated composite, the hot forging process of monolithic high-Cr white cast iron and high-Cr white cast iron/low carbon steel laminate is simulated by means of hot compression tests using Gleeble 3500 thermo mechanical simulator and professional plastic forming software DEFORM-3D. The results reveal that during hot compression process, the monolithic cast iron suffered severe barreling and cracking, whereas the cast iron layer within the laminate underwent large plastic deformation with barreling-free and crack-free. Such a significant improvement can be attributed to the simultaneous deformation of the cast iron together with the low carbon steel claddings, which is beneficial to relieving the stress in the cast iron and changing its deformation mode. Under the triaxial compressive stress state, the brittle high-Cr white cast iron within the laminate can flow like a ductile material at high temperatures and low strain rates.

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“…It is well known that high-Cr cast irons (HCCIs) possess high hardness and excellent wear resistance with inherent server brittleness because of the microstructural characteristics consisting of massive hard carbides in the ferrous matrix [17][18][19] . High crack sensitivity derived from the brittleness results in an inferior deformability of the HCCIs.…”

Section: Introductionmentioning

confidence: 99%

Interface analysis and hot deformation behaviour of a novel laminated composite with high-Cr cast iron and low carbon steel prepared by hot compression bonding

Jiang

Gao

et al. 2015

J. Iron Steel Res. Int.

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. (2015). Interface analysis and hot deformation behaviour of a novel laminated composite with high-Cr cast iron and low carbon steel prepared by hot compression bonding. Journal of Iron and Steel Research International, 22 (5), 438-445. Interface analysis and hot deformation behaviour of a novel laminated composite with high-Cr cast iron and low carbon steel prepared by hot compression bonding AbstractA hot compression bonding process was developed to prepare a novel laminated composite consisting of highCr cast iron (HCCI) as the inner layer and low carbon steel (LCS) as the outer layers on a Gleeble 3500 thermomechanical simulator at a temperature of 950 °C and a strain rate of 0.001 S -1 . Interfacial bond quality and hot deformation behaviour of the laminate were studied by microstructural characterisation and mechanical tests. Experimental results show that the metallurgical bond between the constituent metals was achieved under the proposed bonding conditions without discernible defects and the formation of interlayer or intermetallic layer along the interface. The interfacial bond quality is excellent since no deterioration occurred around the interface which was deformed by Vickers indentation and compression test at room temperature with parallel loading to the interface. After well cladding by the LCS, the brittle HCCI can be severely deformed (about 57 % of reduction) at high temperature with crack-free. This significant improvement should be attributed to the decrease of crack sensitivity due to stress relief by soft claddings and enhanced flow property of the HCCI by simultaneous deformation with the LCS.

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The Role of Silicon in the Solidification of High-Cr Cast Irons

Cited by 28 publications

References 43 publications

Study of spark plasma sintered nanostructured ferritic steel alloy with silicon carbide addition

Study of spark plasma sintered nanostructured ferritic steel alloy with silicon carbide addition

A Comparison of Hot Deformation Behavior of High‐Cr White Cast Iron and High‐Cr White Cast Iron/Low Carbon Steel Laminate

Interface analysis and hot deformation behaviour of a novel laminated composite with high-Cr cast iron and low carbon steel prepared by hot compression bonding

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