Microstructure and wear behavior of spray-formed and conventionally cast rolls of 18Cr–2.5Mo–Fe alloy

Guo, Mingsheng; Chiang, Chun-Hsien; Tsao, Chi Y.A.

doi:10.1016/s0921-5093(01)01434-4

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…The conventionally cast material, in agreement with the literature, was characterized by a considerably coarser eutectic carbide morphology than the spray formed material , Fig. d.…”

Section: Resultssupporting

confidence: 87%

“…Matsuo et al made a similar observation when comparing the sliding wear performances (pin‐on‐disk test) . Ted Guo et al did not observe a considerable difference between the sliding wear performances (pin‐on‐disk test), but noted that the spray formed high‐chromium white iron showed better fracture resistance than the conventionally cast high‐chromium white iron . Kasama et al used dry sand rubber wheel test to compare between the abrasive wear resistances of spray formed and conventionally cast high‐chromium white irons .…”

Section: Introductionmentioning

confidence: 92%

“…The rapid solidification and the high kinetic energy promote development of fine and uniform microstructure . In case of high‐chromium white irons, spray forming has been shown to produce considerably finer and more uniform carbide morphology than conventional casting .…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and wear resistance of spray formed and conventionally cast high‐chromium white iron

Lotta

Hannula

2014

Materialwissenschaft Werkst

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A billet of hypoeutectic high‐chromium white iron (19% Cr, 2.5% C) was spray formed using Gas‐to‐Metal Ratios (GMR) of 0.9, 1.0, and 1.1. Microstructural studies and dry sand rubber wheel abrasion tests were carried out, on the one hand, to compare between the spray formed and conventionally cast material and, on the other hand, to investigate the relationship between gas‐to‐metal‐ratio, eutectic carbide morphology and abrasion resistance. The spray formed material was characterized by a considerably finer carbide morphology (max. ˜30 μm) than the conventionally cast material (max. 100–200 μm). The coarser carbide morphology is believed to be responsible for the superior abrasion resistance of the conventionally cast material. Although the carbide morphology of the spray formed material was only moderately influenced by the changes in the gas‐to‐metal‐ratio, there was a clear improvement in the abrasion resistance with decreasing gas‐to‐metal‐ratio. The improvement correlated with a decrease in the fraction of very fine (<1.5 μm) carbides, rather than with an increase in the mean carbide size.

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“…The conventionally cast material, in agreement with the literature, was characterized by a considerably coarser eutectic carbide morphology than the spray formed material , Fig. d.…”

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 92%

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Microstructure and wear resistance of spray formed and conventionally cast high‐chromium white iron

Lotta

Hannula

2014

Materialwissenschaft Werkst

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“…High chromium (Cr) cast irons are commonly used in applications requiring excellent abrasive and erosive resistance, as in the mining and mineral ore processing industry, the exceptional abrasive and erosive resistance of high‐Cr cast irons derive from the unique microstructure, which consists of an austenitic dendrite/martensitic matrix and a high volume fraction of hard carbides, The use of conventional casting techniques for these iron alloys leads to coarse microstructure with interconnected eutectic carbides type M 7 C 3 (M = Cr, Fe), reducing their impact toughness 1,2 . One of the strategies employed to improve the mechanical properties of these alloys is the micro‐structural control of eutectic carbides.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Hadfield steel matrix by oriented high-chromium cast iron bars

Niu

2010

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T To attain a wear-resistant material compatible with high hardness and high toughness,Hadfield steel matrix was reinforced by oriented high chromium cast iron bars, through inserting high chromium alloys flux-cored welding wires into Hadfield steel melt at 1500 ± 10 • C. The obtained composites were investigated by XRD, SEM, microhardness, three-body abrasion wear and impact toughness testers. The results show that the alloy powders inside the flux-cored welding wires can be melted by the heat capacity of Hadfield steel melt and in situ solidified into high chromium cast iron bar reinforcements tightly embedded in the matrix. The micro-hardness of reinforcements of the water-quenched composite is about four times higher than that of the matrix. The impact toughness of the water-quenched composite is higher than that of the as-cast composite and lower than that of Hadfield steel, and its fracture mechanism is very complicated and refers to brittle and ductile mixture fracture mode. The excellent impact toughness and better wear resistance of the water-quenched composite are attributed to combine fully the advantages and avoid the drawbacks of both Hadfield steel and high chromium cast iron. Additionally, in industrial application, the pulverizer plate produced by this composite, has also better wear resistance compared to the reference Hadfield steel pulverizer plate.

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“…Avery [5] reported that the best performance of ball mill liners was achieved when there are 20% retained austenite. Conventional cast techniques of these alloys present coarse microstructures with interconnected eutectic carbides type M 7 C 3 (M⇒Cr, Fe), leading to decrease of impact resistance, ductility and fatigue resistance [6,7]. The microstructural control of eutectic carbides has been a strategy in order to improve mechanical properties of these alloys.…”

Section: Introductionmentioning

confidence: 99%

Retained Austenite in Spray Formed High Chromium White Cast Iron

Matsuo

Kasama

Kiminami

et al. 2004

JMNM

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High-chromiun white cast irons are widely used for applications which require high wear and corrosion resistance. In this work it was investigated the microstructure of spray formed high chromium white cast iron alloys with the following compositions: 2.4%C-15.3%Cr; 3.6%C-14.5%Cr; 2.9%C-18.8%Cr. A gas-metal mass flow ratio of 0.23 and nitrogen were used for spray processing. The spray formed deposits, the overspray powders (particles that bounce off the deposit and do not participate in its consolidation) and conventionally cast samples were characterized by optical microscopy, scanning electron microscopy and x-ray diffraction. The deposits showed a microstructure formed by fine M 7 C 3 carbides (<50um in length) for the three compositions. The matrix microstructure changed with composition; the 2.4%C-15.3%Cr alloy showed mainly an austenitic matrix whereas the 3.6%C-14.5%Cr and 2.9%C-18.8%Cr alloys showed a matrix with larger amounts of martensite. These microstructures are quite different from the eutetic M 7 C 3 carbides (>300um in length) and a matrix of austenitic dendrites and some martensite, which are observed in conventionally cast alloys. Overspray powders of all compositions studied showed a microstructure composed mainly of austenite. The formation of carbides was suppressed. It was observed that the overspray powders presented a higher amount of retained austenite than the spray formed deposits and the conventionally cast material; the rapid solidification of the droplets enhanced the solid solution of the elements carbon and chromium in austenite, leading to a depression of the Ms temperature of the alloys to below room temperature, thus avoiding the austenite to martensite transformation.

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Microstructure and wear behavior of spray-formed and conventionally cast rolls of 18Cr–2.5Mo–Fe alloy

Cited by 17 publications

References 10 publications

Microstructure and wear resistance of spray formed and conventionally cast high‐chromium white iron

Microstructure and wear resistance of spray formed and conventionally cast high‐chromium white iron

Reinforcement of Hadfield steel matrix by oriented high-chromium cast iron bars

Retained Austenite in Spray Formed High Chromium White Cast Iron

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