Microstructure evolution of grey cast iron powder by high pressure gas atomization

Yang, Min; Dai, Yumei; Song, Changjiang; Zhai, Qijie

doi:10.1016/j.jmatprotec.2009.09.023

Cited by 35 publications

(15 citation statements)

References 7 publications

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“…Assuming that the heat transfer between a spherical liquid droplet and gas medium during gas-atomization is controlled by convective heat transfer, the cooling rate of a spherical droplet can be estimated by the following formula [32,33]:…”

Section: Relationship Between Cooling Rate and Martensite Formation In The Steel Powdersmentioning

confidence: 99%

A Comprehensive Study of Steel Powders (316L, H13, P20 and 18Ni300) for Their Selective Laser Melting Additive Manufacturing

Yan

Zhou

et al. 2019

Metals

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The determination of microstructural details for powder materials is vital for facilitating their selective laser melting (SLM) process. Four widely used steels (316L, H13, P20 and 18Ni300) have been investigated to detail their powders’ microstructures as well as laser absorptivity to understand their SLM processing from raw material perspective. Phase components of these four steel powders were characterized by X-ray diffraction (XRD), synchrotron radiation X-ray diffraction (SR-XRD) and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were utilized to reveal the surface structure of these four steel powders. It is found that phase components of H13, P20 and 18Ni300 are mainly composed of martensite and a small amount of austenite due to the high cooling rate during gas atomization processing, while 316L is characterized by austenite. XPS results show that the four steel powders all possess a layered surface structure, consisting of a thin iron oxide layer at the outmost surface and metal matrix at the inner surface. It is found that the presence of such oxide layer can improve the absorptivity of steel powders and is beneficial for their SLM process.

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Section: Relationship Between Cooling Rate and Martensite Formation In The Steel Powdersmentioning

confidence: 99%

A Comprehensive Study of Steel Powders (316L, H13, P20 and 18Ni300) for Their Selective Laser Melting Additive Manufacturing

Yan

Zhou

et al. 2019

Metals

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“…Figure 3a shows that morphology of the AlCoCrFeNi powder used to fabricate the thin-walled samples; the particles of the powder were spherical or nearly spherical and had relatively smooth surfaces. A few aggregates of the powder particles, called "satellite particles," formed because of the turbulent flow in the atomisation chamber and owing to the collisions of the solidifying droplets [37,38]. During the gas atomisation of the molten alloy, a small number of porosities also formed.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Microstructural characterisation of high-entropy alloy AlCoCrFeNi fabricated by laser engineered net shaping

Kunce

Polański

Karczewski

et al. 2015

Journal of Alloys and Compounds

169

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“…The microstructure of melt-spun M3.9 and M4.4 is complex, but similar to microstructures of cast irons processed by melt spinning and gas atomization [19,23,27,30,31], Figure 1c. It turns out that the observed microstructure varies over the volume of the ribbons, both along their length and over their thickness.…”

Section: Microstructure and Hardness Of White-solidified Low-alloy Camentioning

confidence: 71%

Low‐temperature annealing and graphitizing of white‐solidified low‐alloy cast irons

Kante

Leineweber

Holst

et al. 2019

Materialwissenschaft Werkst

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Hypoeutectic iron‐carbon and iron‐carbon‐silicon model alloys as well as conventional cast irons GJL‐250mod and EN‐GJS‐600‐3 have been produced and processed by different solidification techniques, i. e. mold casting, electron beam surface remelting and melt spinning. The white‐solidified alloys exhibit different degrees of microstructural refinement indicated by a secondary dendrite arm spacing of 0.3 μm–12 μm. The effects of microstructural refinement and silicon content on the hardness as well as on coarsening of cementite and graphitizing at temperatures of 540 °C to 670 °C have been investigated. The hardness of the as‐solidified alloys increases with decreasing secondary dendrite arm spacing and increasing silicon content. High silicon content effectively retards coarsening of pearlitic cementite, and thus is beneficial to retain the hardness at small thermal load. On the downside, high degree of microstructural refinement and high silicon content promote and accelerate graphitizing at temperatures > 600 °C. The results are discussed in terms of the applicability of a recently developed two‐step surface treatment for cast irons, i. e. electron beam remelting followed by nitriding.

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Microstructure evolution of grey cast iron powder by high pressure gas atomization

Cited by 35 publications

References 7 publications

A Comprehensive Study of Steel Powders (316L, H13, P20 and 18Ni300) for Their Selective Laser Melting Additive Manufacturing

A Comprehensive Study of Steel Powders (316L, H13, P20 and 18Ni300) for Their Selective Laser Melting Additive Manufacturing

Microstructural characterisation of high-entropy alloy AlCoCrFeNi fabricated by laser engineered net shaping

Low‐temperature annealing and graphitizing of white‐solidified low‐alloy cast irons

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