Microstructure-property relationships in high chromium white iron alloys

Tabrett, C. P.; Sare, I.R.; Ghomashchi, Reza

doi:10.1179/imr.1996.41.2.59

Cited by 301 publications

(167 citation statements)

References 51 publications

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“…The addition of small amounts of Mo (i.e., 0.5 % Mo) is sufficient for suppressing pearlite formation when particularly used in combination with other elements such as copper and at a higher Cr/C ratio [15,16]. According to previous studies [17][18][19], some martensite may also present in the austenitic structure, predominantly in localized regions adjacent to the eutectic carbides where the depletion of chromium and carbon from the austenite has raised the Ms temperature sufficiently to permit the transformation to martensite. The pearlitic matrix was obtained in the low-Cr white cast iron in the absence of other alloying additions [20].…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

et al. 2015

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This study aims to investigate the effect of Cr/ C ratio on wear and corrosion behavior of a group of highCr white cast iron (HCCI) alloys. Three different alloys of HCCI with different chemical compositions were tested against 3.5 % NaCl, 0.5 M H 2 SO 4 , and 0.5 M NaOH solutions as corrosive media. Electrochemical polarization technique has been used to determine the corrosion current density. The microstructure characteristics of HCCI alloys were analyzed by using optical microscope, SEM, EDS, and XRD. XRD analysis reveals that the microstructure of the HCCI alloys is composed of a network of chromiumrich carbides (M 7 C 3 ) in an austenitic matrix. The abrasive wear resistance of HCCI alloys was found to be rely on their chemical composition and microstructure. The corrosion resistance of the HCCI alloys strongly depends on the Cr/C ratio and the ratio of chromium content in the M 7 C 3 carbide to that in the matrix (CrM 7 C 3 /Matrix). The experimental results of this study showed that the alloy HCCI-2 with the lower Cr/C ratio exhibited the lowest abrasive wear loss while the alloy HCCI-1 with higher Cr/ C ratio exhibited the highest abrasive wear loss. On the other hand, the HCCI-1 alloy was the most corrosion resistant and revealed the lowest current density. In addition, the corrosion current density of all specimens is elevated in 0.5 M H 2 SO 4 solution in comparison with 3.5 wt% NaCl and 0.5 M NaOH solutions.

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Section: Microstructure Characterizationmentioning

confidence: 99%

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

et al. 2015

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“…Figure 3 shows the references sample, Figure 4, 5, 6 respectively showing samples modified by 0.25%, 0.5% and 0.75% Fe-Ti. Therefore, it can be noticed that a modification of titanium affects not only the improvement of hardness and abrasion resistance [5,6], but the appropriate choice of amount of modifier may also reduce the tendency to hot cracking.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore it is important to test susceptibility to hot cracks [5][6][7][8]. The relative tendency to hot cracking for selected white cast iron is shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

The Althoff-Radtke Test Adapted for High Chromium Cast Iron

Kopyciński¹,

Siekaniec²,

Szczęsny³

et al. 2016

Archives of Foundry Engineering

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The paper presents results of the possibility of adapting the Althoff-Radtke test for High Chromium Cast Iron. The Althoff-Radtke test is a clump attempt used for steel. The Althoff-Radtke test has four different lengths of clamp which qualifies it as a test to quantitatively take into account different kinds of shrinkage ΔL. The length of the slot of the cracked corner and the length of each staple (50 -350 mm) are the parameters tendency to cast cracks. Castings of white cast iron have a high tendency to hot cracking due to the large range of solidification temperatures, unfavorable kinetics parameters of shrinkage, and especially a lack of expansion before shrinkage. Shrinkage of high chromium white cast iron is similar to the shrinkage of cast steel, and is approximately 2%. Therefore it is important to test susceptibility to hot cracks. Research was carried out under industrial conditions. Four melts were performed, one of the initial chemical composition and the other three modified by different amounts of Fe-Ti, respectively, 0.25%, 0.5% and 0.75% Fe-Ti. The propensity for hot cracking was based on the observation of the dark surface in the corner of the sample. The study shows that the Althoff-Radtke test can be adapted to determine the tendency for hot cracking of high chromium cast iron. It should however be noted that the test results cannot be compared with those for other alloys.

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“…In the wet wear applications, such as the desulfurization slurry pump, the HCCI must have a stable austenite. For this purpose elements such as nickel, molybdenum, copper and so on, are added [1][2][3][4][5][6][7][8][9][10]. Nerveless, there are some limitations and problems to be resolved in order to HCCI had more applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Inoculants on Impact Toughness in High Chromium Cast Iron

Siekaniec

Kopyciński

Guzik

et al. 2017

Archives of Foundry Engineering

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The present work, presented the study of effect of different inoculants on impact toughness in High Chromium Cast Iron. The molds were pouring in industrial conditions and samples were tested in laboratory in Faculty of Foundry Engineering at AGH. Seven samples were tested -one reference sample, three with different addition of Fe-Ti, and three with different addition of Al. The samples were subjected to impact toughness on Charpy hammer and the hardness test. The presented investigations indicate that for the each inoculant there is an optimal addition at which the sample obtained the highest value of impact toughness. For the Fe-Ti it is 0.66% and for Al is 0.17%. Of all the examined inoculants best results were obtained at a dose of 0.66% Fe-Ti. Titanium is a well-known as a good modifier but very interesting results gives the aluminum. Comparing the results obtained for the Fe-Ti and Al can be seen that in the case of aluminum hardness is more stable. The hardness of all samples is around 40-45 HRC, which is not high for this type of cast iron. Therefore, in future studies it is planned to carry out the heat treatment procedure that may improves hardness.

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Microstructure-property relationships in high chromium white iron alloys

Cited by 301 publications

References 51 publications

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

The Althoff-Radtke Test Adapted for High Chromium Cast Iron

Effect of Different Inoculants on Impact Toughness in High Chromium Cast Iron

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