As-cast carbides in high-speed steels

Peidao, Ding; Shi, Guoqiang; Zhou, Shining

doi:10.1007/bf02668195

Cited by 40 publications

(41 citation statements)

References 10 publications

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“…This kind of carbide is dominant eutectic carbide in all cast steels used in this experiment. It is agree with the result 10) that M 2 C is the main eutectic carbide in cast Mo high-speed steels. It must be noted that the only eutectic type carbide, which observed in Ti-alloyed steels, is M 2 C.…”

Section: Lamellar M 2 C Eutecticsupporting

confidence: 93%

“…9 can be mentioned clearly in Figs. 10 and 11. These figures show the volumes of MC carbides versus the ratio of Nb/V or Ti/V (wt%/wt%), replacement of V by Nb in Nb-alloyed steels and Ti in Ti-alloyed steels, and the ratio of Nb/(WϩMo) or Ti/(WϩMo) (wt%/wt%), replacement of W by Nb in Nb-alloyed steels and Ti in Tialloyed steels (according to what has been mentioned in Sec.…”

Section: Titanium Carbidementioning

confidence: 99%

“…Their crystal lattices are FCC and there are always lack of carbon in VC and NbC. 10,11) It is reported that the MC lattices parameters are 0.4173, 0.4433 and 0.4320 nm for VC, NbC and TiC respectively. 6,12) The MC carbides are the hardest among all kinds of carbides in HSS.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ti and Nb on the Formation of Carbides and the Mechanical Properties in As-cast AISI-M7 High-speed Steel.

Kheirandish

2001

ISIJ International

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In this research, the carbides of as-cast AISI M7 high-speed steel, in which different amounts of V and W were replaced by equivalent Ti and Nb, were investigated using light and electron microscope. EDX and WDX analysers were used in order to recognize the type and formulae of carbides. The volume fractions of each type of carbides are determined using especial etchant, so that the effects of Nb and Ti on the carbides types, shapes and volume percentages could be understand.The results show that Nb and Ti increase the volume fraction of MC instead of M 2 C or M 6 C and decrease the volume fractions of total carbides. It is also found that, the volume fractions of M 2 C decrease and M 6 C increase with increasing Nb percentage.

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Section: Lamellar M 2 C Eutecticsupporting

confidence: 93%

Section: Titanium Carbidementioning

confidence: 99%

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Effect of Ti and Nb on the Formation of Carbides and the Mechanical Properties in As-cast AISI-M7 High-speed Steel.

Kheirandish

2001

ISIJ International

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“…[5,19] In order to minimize the measurement errors of the amount and size of as-cast carbides obtained by quantitative metallography, more than 40 fields of vision for each datum were used. [5,19] In order to minimize the measurement errors of the amount and size of as-cast carbides obtained by quantitative metallography, more than 40 fields of vision for each datum were used.…”

Section: Methodsmentioning

confidence: 99%

“…It had been identified that a higher vanadium content in the melt favored the formation of the M 2 C eutectic carbide and inhibited the occur- [5] rence of the M 6 C eutectic carbide. It had been identified that a higher vanadium content in the melt favored the formation of the M 2 C eutectic carbide and inhibited the occur- [5] rence of the M 6 C eutectic carbide.…”

Section: B Effects Of Silicon On the Types Of Eutectic Carbidesmentioning

confidence: 99%

Carbides in high-speed steels containing silicon

Pan

Peidao

Tang

et al. 2004

Metall Mater Trans A

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The effects of silicon additions up to 3.5 wt pct on the as-cast carbides, as-quenched carbides, and as-tempered carbides of high-speed steels W3Mo2Cr4V, W6Mo5Cr4V2, and W9Mo3Cr4V were investigated. In order to further understand these effects, a Fe-16Mo-0.9C alloy was also studied. The results show that a critical content of silicon exists for the effects of silicon on the types and amount of eutectic carbides in the high-speed steels, which is about 3, 2, and 1 wt pct for W3Mo2Cr4V, W6Mo5Cr4V2, and W9Mo3Cr4V, respectively. When the silicon content exceeds the critical value, the M 2 C eutectic carbide almost disappears in the tested high-speed steels. Silicon additions were found to raise the precipitate temperature of primary MC carbide in the melt of high-speed steels that contained d-ferrite, and hence increased the size of primary MC carbide. The precipitate temperature of primary MC carbide in the high-speed steels without d-ferrite, however, was almost not affected by the addition of silicon. It is found that silicon additions increase the amount of undissolved M 6 C carbide very obviously. The higher the tungsten content in the high-speed steels, the more apparent is the effect of silicon additions on the undissolved M 6 C carbides. The amount of MC and M 2 C temper precipitates is decreased in the W6Mo5Cr4V and W9Mo3Cr4V steels by the addition of silicon, but in the W3Mo2Cr4V steel, it rises to about 2.3 wt pct.

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