Microstructure-property relationships in high chromium white iron alloys

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

doi:10.1179/095066096790326075

Cited by 82 publications

(161 citation statements)

References 32 publications

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“…14) On the other hand, the rubber wheel test, commonly used to study low stress abrasion using a softer counterbody, may allow the abrasive particles to ride over carbide particles through deflection of the rubber wheel, reducing the depth of cut and likelihood of carbide fracture. 11) Wear resistance of AO is better than AS due to carbide size. Dogan and Hawk 15) found that for high stress abrasion test the volume wear rate decreases with increasing carbide volume fraction and with increasing superheat or with increasing carbide size at the same carbide volume fraction.…”

Section: Wear By the Okoshi Type Testmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron

2004

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Semi-solid processed 18% Cr and 27% Cr cast irons were produced by using copper cooling plate and metal mold. A series of experiments were carried out to clarify the effect of heat treatment on microstructure, hardness, wear properties, and corrosion characteristics. The results show that 27% Cr alloys possess better abrasive resistance than 18% Cr alloys due to higher carbide volume under all the conditions when tested by dry sand rubber wheel with silica abrasive. However 18% Cr alloys show higher wear resistance than 27% Cr alloys when using super hard alloy disk against the specimen plate surface. The harder disk indent into the carbides, leads to spalling and pitting, and therefore greater wear rate. For the corrosion test result, 27% Cr alloys have better corrosion resistance than 18% Cr alloys as a result of higher chromium content. A combination of semi-solid processing and heat treatment improves wear resistance and corrosion resistance of chromium cast iron.

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Section: Wear By the Okoshi Type Testmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron

2004

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“…Therefore, it considered that the introduction of parabolic curve to express the relationship between R W and V £ is appropriate. 3,5,7,13,15,16) The relations can be expressed by the following equations, …”

Section: Abrasive Wear Behaviourmentioning

confidence: 99%

Two-Body and Three-Body Types Abrasive Wear Behavior of Hypoeutectic 26 mass% Cr Cast Irons with Molybdenum

et al. 2012

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Hypoeutectic 26 mass% Cr cast irons with 03 mass% Mo were prepared in order to investigate their abrasive wear behavior. The annealed test pieces were hardened from 1323 K and then tempered at three levels of temperatures between 673 and 823 K for 7.2 ks, the temperature giving the maximum hardness (H Tmax ), lower temperature than that at H Tmax (L-H Tmax ) and higher temperature than that at H Tmax (H-H Tmax ). The abrasive wear resistance was evaluated using Suga wear test (two-body-type) and Rubber wheel wear test (three-body-type). It was found that hardness and V £ in the heat-treated specimens varied depending on the Cr and Mo contents. A linear relation was obtained between wear loss and wear distance. The lowest wear rate (R W ) was obtained in both the as-hardened and H Tmax specimens. The highest R W was mostly obtained in the H-H Tmax specimens. Under the same heat treatment condition, the R W in Suga wear test was much greater than that in Rubber wheel wear test. The R W decreased with increasing hardness. The lowest R W obtained in the specimen with a certain amount of retained austenite, 1015%V £ . The R W decreased with increasing Mo content in Suga abrasive test and it decreased little by Mo addition in Rubber wheel wear test.

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“…The microstructure of the superduplex with 3.7%B presented by Beraldo et al 1 is composed of almost 40 vol.% of primary borides in a very soft austenitic/ferritic matrix (22 HRC) while the microstructure SF-SMSS 0.7%B is composed of less than 10 vol.% of interconnected secondary borides that involve the harder martensitic matrix (37 HRC) which results in both materials with ultimately the same hardness. Tabrett et al 18 , in their work on wear resistance of high chromium cast irons, showed that the ratio of abrasive grit size to the mean free distance of the matrix (RAM) can give an idea of the protection of the matrix offered by the carbides present in those materials. Fulcher et al 19 showed that if the RAM is large, i.e., if the distance between the hard particles is small, the carbides protect the matrix against wear and the matrix provides mechanical support to the carbides.…”

Section: Hardness and Wear Resistancementioning

confidence: 99%

Microstructure and wear resistance of spray-formed supermartensitic stainless steel

et al. 2013

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Since the early 90's the oil industry has been encouraging the development of corrosion and wear resistant alloys for onshore and offshore pipeline applications. In this context supermartensitic stainless steel was introduced to replace the more expensive duplex stainless steel for tubing applications. Despite the outstanding corrosion resistance of stainless steels, their wear resistance is of concern. Some authors reported obtaining material processed by spray forming, such as ferritic stainless steel, superduplex stainless steel modified with boron, and iron-based amorphous alloys, which presented high wear resistance while maintaining the corrosion performance 1,2 . The addition of boron to iron-based alloys promotes the formation of hard boride particles (M 2 B type) which improve their wear resistances [3][4][5][6][7][8][9] . This work aimed to study the microstructure and wear resistance of supermartensitic stainless steel modified with 0.3 wt. (%) and 0.7 wt. (%) processed by spray forming (SF-SMSS 0.3%B and SF-SMSS 0.7%B, respectively). These boron contents were selected in order to improve the wear resistance of supermartensitic stainless steel through the formation of uniformly distributed borides maintaining the characteristics of the corrosion resistant matrix. SF-SMSS 0.7%B presents an abrasive wear resistance considerably higher than spray-formed supermartensitic stainless steel without boron addition (SF-SMSS).

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Microstructure-property relationships in high chromium white iron alloys

Cited by 82 publications

References 32 publications

Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron

Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron

Two-Body and Three-Body Types Abrasive Wear Behavior of Hypoeutectic 26 mass% Cr Cast Irons with Molybdenum

Microstructure and wear resistance of spray-formed supermartensitic stainless steel

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