Effects of a Destabilization Heat Treatment on the Microstructure and Abrasive Wear Behavior of High-Chromium White Cast Iron Investigated Using Different Characterization Techniques

Gaşan, Hakan; Erturk, Fatih

doi:10.1007/s11661-013-1851-3

Cited by 80 publications

(40 citation statements)

References 41 publications

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“…10,11 An optimal destabilization process is highly dependent on the temperature (900-1150°C) and holding time (5 min to 8 h), and thus, the used parameters together with the chemical composition (especially the Cr/C ratio) will determine the type of SC. 9,[12][13][14][15] The parameters used during destabilization also determine the amount of carbon that remains in solution in the austenitic matrix and therefore the amount of retained austenite, its final hardness and subsequent resistance. 14 Destabilization at higher temperatures leads to a reduction in the driving force for carbide precipitation, resulting in a lower Ms temperature, and therefore, a large amount of austenite will be retained within the martensitic matrix, with lower overall material hardness.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

et al. 2020

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The excellent abrasion resistance of high-chromium cast irons (HCCIs) is given by an optimal combination of hard eutectic and secondary carbides (SC) and a supporting matrix. The tailoring of the microstructure is performed by heat treatments (HTs), with the aim to adjust the final properties (such as hardness and abrasion resistance). In this work, the influence of chemical composition on the microstructure and hardness of HCCI_26%Cr is evaluated. An increase in the matrix hardness was detected after HTs resulting from combining precipitation of M 23 C 6 SC during destabilization, and austenite/martensite transformation during quenching. Kinetic calculations of the destabilization process showed that M 7 C 3 secondary carbides are the first to precipitate during heating, reaching a maximum at 850°C. During subsequent heating up to 980°C and holding at this temperature, they transformed completely to M 23 C 6. According to the MatCalc simulations, further precipitation of M 23 C 6 occurred during cooling, in the temperature range 980-750°C. Both phenomena were related to experimental observations in samples quenched after 0-, 30-, 60-and 90-min destabilization, where M 23 C 6 SC were detected together with very fine SC precipitated in areas close to eutectic carbides.

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Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

et al. 2020

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“…The improvement in the wear resistance of high-Cr cast iron can be achieved when the as-cast austenite matrix was transformed to martensitic matrix by destabilization treatment. 18) The martensitic matrix with precipitation of numerous secondary carbides is often preferred for many wear applications. 17) The microstructures of the alloys exhibiting the matrix and distribution of secondary carbides after destabilizing treatment are shown in Fig.…”

Section: Microstructure After Heat Treatmentmentioning

confidence: 99%

Effect of Si Content on the Microstructure and Wear Resistance of High Chromium Cast Iron

et al. 2018

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“…Moreover, the network eutectic carbides are very stable so that they are not easily eliminated by heat treatment [3,8]. Therefore, the microstructure of high-chromium white irons is improved by various heat treatment methods, such as destabilization heat treatment and sub-critical heat treatment [5,[9][10][11][12]. Destabilizing heat treatment with relative low austenitizing temperature is used to cause coarse secondary carbides to precipitate [8], which lowers the alloy content in austenite and leads to the martensitic transformation at room temperatures if cooling is fast enough [5].…”

Section: Introductionmentioning

confidence: 99%

“…While subcritical heat treatment below the austenitizing temperature is used to reduce the retained austenite and obtain a martensitic matrix by the precipitation of large quantities of fine secondary carbides [11,13]. The retained austenite has a high intrinsic fracture toughness [14] and transformation-induced plasticity (TRIP) by strain-induced martensitic transformation [9,10], such as wear induced martensitic transformation [11]. However, it is easy to cause high phase-transformation stress and cracking during the transformation induced by wear [12].…”

Section: Introductionmentioning

confidence: 99%

High hardness-toughness and wear resistance of white cast iron treated by a multicycle quenching-partitioning-tempering process

Jia

Zuo

et al. 2019

Heat Treatment and Surface Engineering

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2019) High hardness-toughness and wear resistance of white cast iron treated by a multicycle quenching-partitioning-tempering process, Heat Treatment and Surface Engineering, 1:1-2, 57-62, ABSTRACTBased on a multicycle quenching-partitioning-tempering process, a novel process is proposed to treat Fe-2.4C-12.0Cr (mass %) white cast iron balls. It is a destabilizing heat treatment following multicycle quenching and sub-critical treatment (De-MQ-Sct) process. Such a complex process may be simply performed by alternate water quenching and air cooling. For comparison, the white cast iron balls also were treated by conventional normalization (NOR) process and oil-quenching process. The partitioning of carbon from martensite to retained austenite during the De-MQ-Sct process promotes the interaction between carbide precipitation and martensitic transformation. While this interaction is a unique effect only produced by multicycle quenching linking destabilizing and sub-critical treatments, which leads to more, and finer, secondary carbides and more carbon-enriched austenite in De-MQ-Sct sample than those in a NOR or oil-quenching sample. The average hardness of 60 HRC and impact toughness of 12.6 J/cm 2 are obtained in De-MQ-Sct white cast iron balls, which are much higher than those in a NOR and oil-quenching ones. The wear behavior measured by pin-on-disk wear tests indicate that the weight loss of De-MQ-Sct sample is only about one-third of the NOR sample and one half of the oil-quenching sample. Microstructural characterization reveals that high hardness-toughness and wear resistance of the De-MQ-Sct balls are mainly attributed to the large quantities of fine secondary carbides and stable carbon-enriched retained austenite. KEYWORDSWhite cast iron ball; destabilizing heat treatment following multicycle quenching and sub-critical treatment (De-MQ-Sct) process; secondary carbide; hardness-toughness; wear resistance

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Effects of a Destabilization Heat Treatment on the Microstructure and Abrasive Wear Behavior of High-Chromium White Cast Iron Investigated Using Different Characterization Techniques

Cited by 80 publications

References 41 publications

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

Effect of Si Content on the Microstructure and Wear Resistance of High Chromium Cast Iron

High hardness-toughness and wear resistance of white cast iron treated by a multicycle quenching-partitioning-tempering process

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