Effect of matrix composition on the microstructure of in situ synthesized TiC particulate reinforced iron-based composites

Mei, Zhiyuan; Yan, Yunjun; Cui, Kun

doi:10.1016/s0167-577x(03)00020-x

Cited by 76 publications

(39 citation statements)

References 13 publications

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“…From the Ti-C phase diagram, [20][21][22] it has been corroborated that TiC X (x 1) exists as a single homogeneous carbide phase with a wide range of stoichiometry, from x ¼ 0:47 to 0.98. Therefore the particle reinforcement produced by in situ reaction is non-stoichiometric TiC x , in which x ferritic 50um (a) value depends on the ratio of Ti/C in the preformed blocks.…”

Section: Microstructural Variation With Tic Additionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Common Straight Carbon Steels Strengthened by TiC Dispersion

Yangshan

Yang

et al. 2006

Mater. Trans.

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TiC particles have been synthesized in common straight steels with three different carbon contents by in situ reaction during melting process. Experimental results show that the distribution of TiC particles in the steels containing 0.55 mass%C and 0.8 mass%C is uniform, however, slight segregation of TiC particles has been observed in the steel containing 1.4 mass%C. With the formation of TiC more ferrite precipitates from the steel with 0.55 mass%C, while the TiC formation inhibits the precipitation of secondary cementite in the steel containing 1.4 wt%C. In the present investigation a proper technique of heat treatment has been designed, after which good mechanical properties as well as high wear resistance have been obtained from the steel with TiC additions. However the effect of TiC addition on wear resistance is weakened with the increase of carbon concentration.

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Section: Microstructural Variation With Tic Additionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Common Straight Carbon Steels Strengthened by TiC Dispersion

Yangshan

Yang

et al. 2006

Mater. Trans.

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“…[18][19][20][21] MMCs have many advantages compared with the monolithic metals, and Fe-based TiC composites have also attracted a lot of attention because of their special properties, such as good machinability, excellent wear resistance and strength retained at elevated temperature. [18][19][20][21] Moreover, there is a great deal of interest in developing lightweight structural materials, and Ti-Al intermetallic compounds (such as TiAl, Ti 3 Al and TiAl 3 ) are a promising new generation of lightweight structural materials for high temperature applications in aerospace eld due to their low densities, good mechanical properties and corrosion resistance at high temperature range. [22][23][24][25] TiAl 3 is the lightest (the density is 3.3 g·cm ) among the TiAl intermetallics.…”

Section: Introductionmentioning

confidence: 99%

Direct Extraction of Titanium Alloys/Composites from Titanium Compounds Ores in Molten CaCl<sub>2</sub>

Zou

et al. 2017

Mater. Trans.

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Molten salt electroreduction process provides a simple approach for the facile production of alloys and composites. In this work, the solid oxide membrane (SOM)-assisted molten salt electroreduction process has been used to produce titanium alloys/composites directly from complex titanium compounds ores. The Ti-bearing blast-furnace slag, high titanium slag and natural ilmenite were used as raw materials. The SOM-assisted electroreduction process was carried out in molten calcium chloride (CaCl 2 ) at 950-1000 C and 3.8 V. The reaction mechanisms of the electroreduction process including the compounding process, the electroreduction process and the impurity-removal process were discussed. The results indicate that Ti

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“…10,11) Furthermore, the majority of iron-and steel-based composites focus on using ceramic particulates, i.e. TiB 2 , TiC, VC, Cr 3 C 2 , etc., 4,8,[9][10][11][12][13][14][15][16][17] as the reinforcements, primarily due to their capability of greatly improving the hardness and wear resistance of the materials. However, little attention has been paid to the intermetallic particulate reinforced steel matrix composite.…”

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Ti5Si3 Intermetallic Particulate Locally Reinforced Medium Carbon Steel-matrix Composite via the SHS Reaction of Fe–Ti–Si System during Casting

Wang

Guan

et al. 2007

ISIJ Int.

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The in situ Ti 5 Si 3 intermetallic particulate locally reinforced steel matrix composites are successfully fabricated by the self-propagating high-temperature synthesis (SHS) reaction of Fe-Ti-Si system during casting, and the microstructures of the composites reveal a relatively uniform distribution of mango-like Ti 5 Si 3 particulates in the local reinforcing regions. XRD results reveal that in addition to a-Fe and Ti 5 Si 3 phases, the transient Fe 2 Ti is also present in the local reinforcing region of the composites. Furthermore, some Ti 3 SiC 2 particulates are formed and distribute in the limited region nearby the interface between the local reinforcing region and steel matrix. With Fe content increasing from 10 to 30 wt% in the preforms, the Ti 5 Si 3 particulate size is decreased obviously in the local reinforcing region; furthermore, the presence of significant porosity can be detected in the composite synthesized by the 10 wt% Fe-Ti-Si system; on the contrary, only a minimal porosity can be found in that synthesized by 30 wt% Fe in Fe-Ti-Si system. The macro-and micro-hardness as well as the wear resistance of the local reinforcing region are obviously higher than those of the unreinforced medium steel. Improvements in hardness and wear resistance of the composite are mainly attributed to the presence of high volume fraction of hard intermetallic Ti 5 Si 3 particulates.KEY WORDS: in situ; intermetallic; locally reinforced; steel matrix composite; SHS. Experimental ProcedureIn this study, the starting materials were made of commercial powders of 10, 20, 30, 40 and 50 wt% Fe (99.0% purity, ϳ10 mm), Ti (99.5 % purity, ϳ38 mm), and Si (99.5 % purity, ϳ15 mm), respectively. Titanium and silicon powders were used in a ratio corresponding to that of stoichiometric Ti 5 Si 3 . Powder blends with different starting compositions were dry-mixed sufficiently by a ball milling for 6 h in a cylindrical stainless steel jar containing GCr15 bearing steel balls with a ball to powder weight ratio of about 5 : 1 by mechanical rotation at 40 rpm, and then were cold-isostatically pressed into cylindrical preforms (about 20 mm diameter and 10 mm length) by using a stainless steel die with two plungers. The green preforms were pressed uniaxially at pressure ranging from 88-92 MPa to obtain relative densities of 63Ϯ2% theoretical density. Then the preforms were placed and fixed on the side of the sand mold, respectively, as schematically illustrated in Fig. 2 in Ref. 11). Subsequently, the medium carbon steel melt, which composition is measured by an ARL4460 Metals Analyzer and shown in Table 1, prepared by non-oxidation process in a 5 kg medium-frequency induction furnace with a temperature of about 1 600°C was poured into the mold to ignite the SHS reaction of the preforms. After solidification and cooling, composite castings were removed and sectioned in the side position.Vickers microhardness values of the matrix and local reinforcing region in the samples were tested under a load of 50 g with an indentarion time of 10...

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Effect of matrix composition on the microstructure of in situ synthesized TiC particulate reinforced iron-based composites

Cited by 76 publications

References 13 publications

Microstructure and Mechanical Properties of Common Straight Carbon Steels Strengthened by TiC Dispersion

Microstructure and Mechanical Properties of Common Straight Carbon Steels Strengthened by TiC Dispersion

Direct Extraction of Titanium Alloys/Composites from Titanium Compounds Ores in Molten CaCl<sub>2</sub>

In Situ Synthesis of Ti5Si3 Intermetallic Particulate Locally Reinforced Medium Carbon Steel-matrix Composite via the SHS Reaction of Fe–Ti–Si System during Casting

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