Abrasion and impact properties of partially chilled gray iron

Giacchi, J.V.; Martinez, Rodolfo A.; Gamba, Matías Rafael Martínez; Dommarco, Ricardo

doi:10.1016/j.wear.2006.05.005

Cited by 13 publications

(3 citation statements)

References 10 publications

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“…Again, in thick section the solidification rate is comparatively low and the graphite easily form and separate out from the liquid metal [14]. According to metallurgical concept for unalloyed castings, when the solidification rate is increased and crossed the critical value, it suppresses the graphitization process and promotes the formation of carbide which increased the hardness of the casting [15]. On the other hand, in Fe-C-Al alloy system during solidification the aluminium firstly accelerate the graphitization process and then after a certain time it depresses the processes and carbide is formed which helps to increase the hardness of the casting.…”

Section: Advanced Materials Research Vols 264-265mentioning

confidence: 99%

Study on the Microstructure and Properties of Fe-C-Si and Fe-C-Al Cast Irons

Shaha

Haque

Khan

2011

AMR

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Two types of cast irons with Fe-C-Si and Fe-C-Al. alloy systems were investigated in the present study. In order to modify the microstructure and properties of cast iron, Al was added to low silicon pig iron that is in Fe-C-Al (Sorel metal) alloy system. Its effect was then studied with comparing to normal Fe-C-Si alloy system. Both cast irons were produced in sand mould of suitable design to provide all information regarding the structure and properties. The microstructure was analyzed using optical microscope which showed the distribution of graphite flakes in pearlite or ferro-pearlite matrix. The size of the graphite flakes in Fe-C-Al system was smaller and more evenly distributed compared to the Fe-C-Si alloy system. The cast product was also characterized by using XRD. The maximum hardness of the Fe-C-Al alloy was measured as 110.2 HRB compared to 89.32 HRB of the conventional Fe-C-Si alloy system. The impact test results showed that Fe-C-Al cast iron has higher impact property than Fe-C-Si cast iron.

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Section: Advanced Materials Research Vols 264-265mentioning

confidence: 99%

Study on the Microstructure and Properties of Fe-C-Si and Fe-C-Al Cast Irons

Shaha

Haque

Khan

2011

AMR

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“…Researches are focused on the adding alloying elements to alter the matrix structure, applying austempering heat treatments, and refining of graphite flakes by inoculation of the iron melt. Ceccarelli et al [3] and Giacchi et al [4] evaluated the influence of graphite morphology on the impact resistance of a chilled ductile iron and gray iron, respectively. The impact toughness has low value due to the high carbide content and graphite type.…”

Section: Introductionmentioning

confidence: 99%

Impact toughness and microstructure of continuous steel wire-reinforced cast iron composite

Akdemir

Kuş

Şi̇mşi̇r

2009

Materials Science and Engineering: A

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“…In the case of a nonfixed abrasive, the wear rate I of binary composites such as solid phase-metal binder is known [2,6,7] to depend on the grain size d and volume content W of the solid phase. This dependence is described by formula [6]:…”

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Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. II. Nonfixed-abrasive wear of ZrB2-containing coatings

Podchernyaeva

Panasyuk

Panashenko

et al. 2009

Powder Metall Met Ceram

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The kinetics of nonfixed-abrasive wear of spark-deposited and laser-spark coatings on titanium alloy is studied. The coatings are deposited using electrode materials with different ZrB 2 contents. It is revealed that the wear rate of the coatings decreases with higher ZrB 2 content of the alloying electrode, after laser fusion, which increases the hardness of the outer layer, and with longer deposition of the coating, which increases its thickness It is shown that combined ZrB 2 -based coating can compete with spark-deposited WC + 3%Co coating.This paper continues the research [1] and focuses on the kinetics of the abrasive wear of ZrB 2 -containing coatings deposited with electrospark alloying (ESA) and combined laser-electrospark method. The ZrB 2 -containing electrode materials were developed at the Institute for Problems of Materials Science (National Academy of Sciences of Ukraine). Table 1 shows the numbers of the samples and compositions of the electrode materials.Tests for abrasive wear resistance were conducted in air with a NAUU friction machine ( Fig. 1) used to compare the wear resistance of materials and coatings during friction on a nonfixed abrasive. Our wear-resistance testing procedure corresponds to GOST 23.208-79 and is close to US standard ASTM G65-04. A 30 × 30 mm sample with a coating is pressed down with a rubber roll 50 mm in diameter, which rotates and supplies the abrasive to the contact area. The press-down force is controlled by loading. The tests were performed at a sliding speed of 0.163 m/sec and a load of 44.1 and 84.2 N. Quartz sand (SiO 2 ) with a grain size of 100-160 μm was used as an abrasive. The wear was measured gravimetrically to 0.0001 g. The volume wear was assessed taking into account the density of the material deposited. 436 3 4 5 6 2 1 Fig. 1. Friction machine with a nonfixed abrasive: 1) rubber roll, 2) sample, 3) feeder, 4) sand, 5) tray, 6) load Figure 2 shows the wear rate (I) of different ZrB 2 coatings on VT-20 alloy as a function of length (L) andtime (τ) of the process. The same dependences were obtained for VT-20 titanium alloy without coating (sample 1) and for spark-deposited WC + 3% Co coating (sample 2). The VK-3 electrode material is selected because the lowcobalt alloy has the highest abrasive wear resistance among WC-Co hard alloys [2]. The three-stage kinetic dependences I (L, τ) are typical of sliding friction [3] and show changes in polyoxide tribofilm in the 'abrasive particle-coating surface' contact area during abrasive wear. The first stage (L ≤ 100 m) is characterized by severe wear, in which a tribofilm forms. The uncoated VT-20 alloy has the highest surface wear rate at this stage, which is determined as tgα = I/L(τ). As the ZrB 2 volume content of the alloying electrode (Table 2) and of the coating increases, the wear rate decreases (Fig. 2). The L value, which corresponds to the 'severe wear → weak wear' transfer for the starting uncoated VT-20 alloy (~200 m) is twice as high for the coatings (~100 m); i.e., a tribofilm over the coatings f...

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Abrasion and impact properties of partially chilled gray iron

Cited by 13 publications

References 10 publications

Study on the Microstructure and Properties of Fe-C-Si and Fe-C-Al Cast Irons

Study on the Microstructure and Properties of Fe-C-Si and Fe-C-Al Cast Irons

Impact toughness and microstructure of continuous steel wire-reinforced cast iron composite

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. II. Nonfixed-abrasive wear of ZrB2-containing coatings

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