Splat-quenching of high speed tool steels

Rayment, J.J.; Cantor, B.

doi:10.1179/msc.1978.12.3.156

Cited by 24 publications

(4 citation statements)

References 8 publications

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“…This bcc phase may correspond to martensite, which contained a high carbon content and lattice strain. [8] Figure 5(a) also shows that the amount of austenite increased with decreasing scan rates. Under this processing condition, a high cooling rate depressed the transformation of ␦ ferrite into austenite and decreased the thickness of the cladded layer.…”

Section: Resultsmentioning

confidence: 67%

“…The dilution of chemical homogenization. [8] Laser cladding of M2 HSS can melt regions with the underlying substrate increases with produce various microstructures, such as ␦ ferrite and austendecreasing layer thicknesses, as shown in Table I. This can ite or martensite and retained austenite, depending on the lead to a decrease of the average carbon and alloying-element cooling rate.…”

Section: Effect Of Scan Line Spacingmentioning

confidence: 96%

“…[3] fore, HSSs need complicated, expensive, and carefully conAccording to the phase diagram of M2 HSS, solidification trolled processing, such as hot working, heat treating, and transformation of M2 involves the following four stages: [4,5,6] machining, from the ingot to the finished product. Rapid L → L ϩ ␦ 1435 ЊC solidification (RS) technologies, such as splat quenching and laser-and electron-beam surface melting, [8][9][10][11] have been L ϩ ␦ → L ϩ ␦ ϩ ␥ 1330 ЊC employed as potential processing routes for HSS materials.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural evolution during laser cladding of M2 high-speed steel

Niu

Chang

2000

Metall Mater Trans A

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Laser cladding of gas-atomized M2 high-speed steel on the mild steel substrate was performed using scan rates of 1 to 10 mm/s, scan line spacings of 0.1 to 0.5 mm, and powder feed rates of 1 to 10 g/min, for a given laser power of 400 W. This article presents a detailed study of the microstructural evolution during laser cladding. The effect of scan rate, scan line spacing, and powder feed rate on cooling rate can be described in terms of the cladding-layer thickness, i.e., the thinner the layer, the higher the cooling rate. The degree of metastability in the laser-clad microstructure can be understood in terms of the lattice parameter of the bcc phase. The lattice parameter of the bcc phase increased with increasing layer thickness and reached a maximum value at a thickness of 0.3 mm. Correspondingly, the microstructure varied from a cellular or dendritic structure of ␦ ferrite and austenite to a mixture of martensite and retained austenite. However, further increasing the layer thickness led to a decrease of both the lattice parameters of the bcc phase and the proportion of retained austenite in the martensite. This was accompanied by an increase of the amount of carbide at the prior austenitic grain boundaries and a decrease of the carbon content in the martensite and retained austenite.

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Section: Resultsmentioning

confidence: 67%

Section: Effect Of Scan Line Spacingmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Microstructural evolution during laser cladding of M2 high-speed steel

Niu

Chang

2000

Metall Mater Trans A

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“…Similar improvements in properties have previously been observed for splatquenched tool steels. 6 Microstructural changes on aging at temperatures of up to 700°C have been examined in situ using a hot stage and transmission electron microscopy. This study, to be reported in more detail at a later date, showed that microstructural changes were hardly detected until about 500 0 e and even in the range 600-700°C took place very slowly (Fig.…”

Section: Hardness and Aging Responsementioning

confidence: 99%