Morphology, microstructure and decomposition behavior of M2C carbides in high speed steel

Zhou, Xuefeng; Liu, Di; Zhu, Wang-long; Fang, Feng; Tu, Yiyou; Jiang, Jianqing

doi:10.1016/s1006-706x(17)30007-9

Cited by 33 publications

(14 citation statements)

References 16 publications

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“…In austenite-carbide eutectics, carbide with higher fusion entropy is generally considered to be a faceted phase, which grows anisotropically during solidification. The morphology and microstructure of plate-like M 2 C exhibit representative characteristics of a faceted phase [14]. From the Figure 5, it can be seen that the M2 HSS ingots consist of numerous M 2 C carbides with a small amount of MC carbides which is consistent with the report by Zhou et al [14] through the X-ray diffraction analysis.…”

Section: Microstructure Of the Composite Layersupporting

confidence: 86%

“…The morphology and microstructure of plate-like M 2 C exhibit representative characteristics of a faceted phase [14]. From the Figure 5, it can be seen that the M2 HSS ingots consist of numerous M 2 C carbides with a small amount of MC carbides which is consistent with the report by Zhou et al [14] through the X-ray diffraction analysis. Figure 6 gives a clear display of the graphite morphology changes in the bimetallic bonding interface of the HSS/DCI composite roll through the optical microscope.…”

Section: Microstructure Of the Composite Layersupporting

confidence: 86%

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Research on the Bonding Interface of High Speed Steel/Ductile Cast Iron Composite Roll Manufactured by an Improved Electroslag Cladding Method

Cao

Dong

Deng

et al. 2018

Metals

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In the present study, a new electroslag cladding method by using of the advanced current supplying mold technology was used for manufacturing the high speed steel (HSS)/ductile cast iron (DCI) composite roll. The graphite morphology, matrix microstructure, elements distribution, carbides morphology, and carbides composition have been investigated by means of optical microscope (OM), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS). With increasing distance from the HSS side, a transition of graphite morphology from naught to existence and from small and dispersed to large and nonuniform was obtained at the interface. It was closely related to the fact that graphite in DCI participated in the phase change and the roll core surface and its nearby positions was heated to a high temperature by the liquid slag during the whole electroslag cladding process. Due to the combined effects of melting and elements diffusion, a significant migration of the alloying elements have occurred through the line scan analysis. Based on this, different types of carbides with the morphology and composition were found at the bonding interface. In addition, no obvious slag inclusions, porosity, shrinkage and other defects at the bonding interface were found. Results of the tensile test also illustrated that the bonding interface had a good quality and it could fully meet the requirements of the roll.

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Section: Microstructure Of the Composite Layersupporting

confidence: 86%

Section: Microstructure Of the Composite Layersupporting

confidence: 86%

Research on the Bonding Interface of High Speed Steel/Ductile Cast Iron Composite Roll Manufactured by an Improved Electroslag Cladding Method

Cao

Dong

Deng

et al. 2018

Metals

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“…M 2 C carbide presents a lamellar or rod-like morphology, M 6 C carbide is characterized by fishbone morphology, and MC shows a feature of blocky morphology. 55) It can be found types of carbide don't change with increasing solidification pressure. Because MC carbide exists rarely and dispersedly in M42 HSS, the effect of solidification pressure on M 2 C and M 6 C carbides were mainly investigated in this research.…”

Section: Effect Of Solidification Pressure On Carbides 321 Type Ofmentioning

confidence: 98%

“…The process of solute redistribution also depends on the The morphology of M 2 C carbides depends mainly on the process of nucleation and growth. 55) According to classical solidification theory, 45) alloy compositions in the residual liquid phase at inter-dendritic areas were much higher than those of system composition in the final stage of solidification. Equation (5) was used to obtain the inter-dendritic average compositions based on data in Fig.…”

Section: C Carbidementioning

confidence: 99%

A Novel Method for Improving Cast Structure of M42 High Speed Steel by Pressurized Metallurgy Technology

Zhu

Jiang

et al. 2018

ISIJ International

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In this paper, a novel method of pressurized metallurgy technology was proposed to improve cast structure of M42 high speed steel (HSS). The effect of solidification pressure (0.1, 1 and 2 MPa) on the cast structure of M42 HSS was investigated by means of experimental analysis and calculation of Thermo-Calc and DICTRA software. Increasing solidification pressure can obviously enhance cooling rate by improving interfacial heat transfer coefficient, which results in some remarkable improvement of the cast structure of M42 HSS. Firstly, the primary/secondary dendrite arm spacing and the average thickness of eutectic ledeburite reduce, which means dendrite structure is refined and eutectic ledeburite more homogeneously distributes with smaller size. Secondly, increasing solidification pressure, the volume fraction of M 6 C carbides decreases obviously and that of M 2 C increases correspondingly. And the morphology of M 2 C carbide changes from larger size lamellar and straight-rod shape into smaller size curved-rod morphology under higher solidification pressure due to larger nucleation number and overgrowth of γ, indicating that carbides are refined and distribute more uniformly. At last, higher solidification pressure is beneficial to reduce the lamellar spacing of M 2 C carbide and make compositions distribute more homogeneously.

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“…High-speed steels are widely used in various applications such as high-load molds, high-temperature aviation bearings, and cutting tools [1,2] due to their excellent hardness, red hardness, heat resistance, and wear resistance. [3,4] In recent years, with the rapid development of a large-scale equipment manufacturing industry, the demand for large-section high-speed steels is increasing. However, the composition characteristics of high-carbon alloys of high-speed steels have led to several problems in largesection ingots such as the serious segregation of components, [5] large carbide sizes, [6] and high distribution unevenness [7] in the center of ingots, which have become important factors restricting the development of large-scale high-speed steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Secondary Aerosol Cooling on the Characteristics of Carbides in M42 High‐Speed Steel Produced by the Electroslag Remelting Withdrawal Process

Jiao

Tong

et al. 2020

steel research int.

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The characteristics of carbides, such as type, size, and distribution, are important factors that affect the quality of high‐speed steel. To improve the characteristics of carbides produced by the electroslag remelting (ESR) process, an innovative process of electroslag remelting withdrawal with secondary aerosol cooling (ESRW–SAC) is proposed. The structure of the molten bath is obtained using tungsten powder detection, and the characteristics of carbides are statistically quantified by scanning electron microscopy (SEM), X‐ray diffraction (XRD), and the Image‐Pro Plus quantitative analysis software. The 3D carbide morphologies and carbides types are determined by an electrolysis device and SEM–energy‐dispersive spectroscopy (EDS). The results show that, compared with the traditional process, without SAC, the structure of the molten metal bath becomes shallower and flatter with the ESRW–SAC process. Under the influence of SAC, the network spacing and lamellar thickness of carbides considerably decrease, the phase area of carbides increases, and the distribution of carbides becomes more uniform. After the ESRW–SAC process, M2C and M6C carbides are still dominant; however, the morphology of M2C carbides changes from a lamellar to a curved short‐rod form.

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Morphology, microstructure and decomposition behavior of M2C carbides in high speed steel

Cited by 33 publications

References 16 publications

Research on the Bonding Interface of High Speed Steel/Ductile Cast Iron Composite Roll Manufactured by an Improved Electroslag Cladding Method

Research on the Bonding Interface of High Speed Steel/Ductile Cast Iron Composite Roll Manufactured by an Improved Electroslag Cladding Method

A Novel Method for Improving Cast Structure of M42 High Speed Steel by Pressurized Metallurgy Technology

Effect of Secondary Aerosol Cooling on the Characteristics of Carbides in M42 High‐Speed Steel Produced by the Electroslag Remelting Withdrawal Process

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