On the nature of eutectic carbides in Cr-Ni white cast irons

Laird, G.; Nielsen, Roger L.; Macmillan, Neil A.

doi:10.1007/bf02646494

Cited by 26 publications

(5 citation statements)

References 10 publications

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“…In addition to the martensite incorporated into this aggregate in the dendrites, there is also lenticular martensite at interfaces between matrix and eutectic carbides (Fig. 3), which is consistent with literature [8,15,18]. Such lenticular martensite is known to form within high carbon steels (>0.5% C) and NiHard-4 [8,33].…”

Section: Microstructure and Heat-treatment Sensitivitysupporting

confidence: 87%

“…Silicon is believed to retard the formation of M 3 C and promote formation of M 7 C 3 eutectic carbides during solidification, where M = (Cr, Fe, Mo) [15,16]. M 7 C 3 is the preferred carbide phase for the eutectic network in abrasion-resistant white cast irons, with M 3 C regarded as less desirable, for two reasons.…”

Section: Basic Characteristics Of Nihard-4 and High-cr-mo Wcismentioning

confidence: 99%

“…In NiHard-4, rejection of Si from the eutectic carbides during solidification results in the adjacent austenite having high Si concentration. The elevated Si concentration acts to increase the carbon activity for a given concentration of C in solution, thereby reducing the net C solubility in this region [8,15]. This lower C austenite has a higher M s and is thus able to form martensite during cooling after solidification (without requiring a subsequent destabilisation treatment).…”

Section: Microstructure and Heat-treatment Sensitivitymentioning

confidence: 99%

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Comparing the abrasion performance of NiHard-4 and high-Cr-Mo white cast irons: The effects of chemical composition and microstructure

Jokari-Sheshdeh

Ali

Gallo

et al. 2022

Wear

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Section: Microstructure and Heat-treatment Sensitivitysupporting

confidence: 87%

Section: Basic Characteristics Of Nihard-4 and High-cr-mo Wcismentioning

confidence: 99%

Section: Microstructure and Heat-treatment Sensitivitymentioning

confidence: 99%

See 1 more Smart Citation

Comparing the abrasion performance of NiHard-4 and high-Cr-Mo white cast irons: The effects of chemical composition and microstructure

Jokari-Sheshdeh

Ali

Gallo

et al. 2022

Wear

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“…The observed core and rim structure occurs because M 3 C forms by a reaction between the remaining liquid and the already formed eutectic M 7 C 3 carbides. [46,[52][53][54] The larger proeutectic M 7 C 3 carbides do not react with a liquid to form the core and rim structure because their surroundings are solid before the peritectic reaction temperature is reached. Instead, the proeutectic M 7 C 3 carbides act as nucleation points for the eutectic formation (L → ␥ ϩ M 7 C 3 ).…”

Section: Microstructurementioning

confidence: 98%

Solidification structure and abrasion resistance of high chromium white irons

Doğan

Hawk

Laird

1997

Metall Mater Trans A

Self Cite

266

124

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Superior abrasive wear resistance, combined with relatively low production costs, makes high Cr white cast irons (WCIs) particularly attractive for applications in the grinding, milling, and pumping apparatus used to process hard materials. Hypoeutectic, eutectic, and hypereutectic cast iron compositions, containing either 15 or 26 wt pct chromium, were studied with respect to the macrostructural transitions of the castings, solidification paths, and resulting microstructures when poured with varying superheats. Completely equiaxed macrostructures were produced in thick section castings with slightly hypereutectic compositions. High-stress abrasive wear tests were then performed on the various alloys to examine the influence of both macrostructure and microstructure on wear resistance. Results indicated that the alloys with a primarily austenitic matrix had a higher abrasion resistance than similar alloys with a pearlitic/bainitic matrix. Improvement in abrasion resistance was partially attributed to the ability of the austenite to transform to martensite at the wear surface during the abrasion process.

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“…Silicon addition above 1.5 wt% hinders the peritectic reaction and thus favors the formation of entirely eutectic M 7 C 3 carbides. Lower silicon contents lead to formation of mixed carbide morphologies of M 3 C and M 7 C 3 , which may impair both abrasion resistance and fracture toughness [10].…”

Section: Introductionmentioning

confidence: 99%

Laser Surface Hardening of Ni-hard White Cast Iron

Al-Sayed

Elshazli

Al-Shatri

2020

Metals

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Laser surface treatment on two different types of nickel–chromium white cast iron (Ni-hard) alloys (Ni-hard 1 and Ni-hard 4) was investigated. Nd:YAG laser of 2.2-kw with continuous wave was used. Ni-hard alloys are promising engineering materials, which are extensively used in applications where good resistance to abrasion wear is essential. The conventional hardening of such alloys leads to high wear resistance nevertheless, the core of the alloy suffers from low toughness. Therefore, it would be beneficial to harden the surface via laser surface technology which keeps the core tough enough to resist high impact shocks. A laser power of different levels (600, 800 and 1000 Watts) corresponding to three different laser scanning speeds (3, 4 and 5 m·min−1) was adopted hoping to reach optimum conditions for wear resistance and impact toughness. The optimum condition for both properties was recorded at heat input of 16.78 J·mm−2. The present findings reflect that the microhardness values and wear resistance clearly increased after laser hardening by almost three times due to laser surface hardening, whereas, the impact toughness was increased from five joules obtained from conventionally heat-treated samples to 6.4 J as gained from laser-treated samples.

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On the nature of eutectic carbides in Cr-Ni white cast irons

Cited by 26 publications

References 10 publications

Comparing the abrasion performance of NiHard-4 and high-Cr-Mo white cast irons: The effects of chemical composition and microstructure

Comparing the abrasion performance of NiHard-4 and high-Cr-Mo white cast irons: The effects of chemical composition and microstructure

Solidification structure and abrasion resistance of high chromium white irons

Laser Surface Hardening of Ni-hard White Cast Iron

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