Increasing Sintering Gate and Avoiding Grain Growth in High Speed Steels by Sintering in Nitrogen Rich Atmospheres

Talacchia, S.; Martín, Jesús Izquierdo; Urrutibeaskoa, I.; Jauregi, S.; Palma, Rodrigo; Martínez, V.; Urcola, J. J.

doi:10.1179/pom.1993.36.4.275

Cited by 20 publications

(14 citation statements)

References 3 publications

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“…Inspired in previous studies at CEIT (Urrutibeaskoa et al, 1993;Talacchia et al, 1996), the processing route for VSI based on M42 powders was presented by Federal Mogul in a PM World Congress (Whitaker et al, 1998) and is patented by Brico Engineering Ltd. (Brico, 1996). Simultaneously, Hitachi and Nissan introduced a development for high performance exhaust VSI based on HSS (Kawata et al, 1998).…”

Section: Introductionmentioning

confidence: 98%

Development of powder metallurgy T42 high speed steel for structural applications

Trabadelo¹,

Giménez²,

Iturriza³

2008

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 98%

Development of powder metallurgy T42 high speed steel for structural applications

Trabadelo¹,

Giménez²,

Iturriza³

2008

Journal of Materials Processing Technology

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“…In recent years, several articles have been published on the liquid-phase sintering of prealloyed tool steels by means of so-called supersolidus liquid-phase sintering (SLPS). [3][4][5][6][7] Compared to PM-HIP, which requires encapsulation of the powder, the benefits of sintering by SLPS are reduced costs, a greater flexibility with respect to the geometry, and the possibility of producing near-net-shape parts.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Investigations of the Supersolidus Liquid-Phase Sintering of Two Plastic Mold Steels

Hill

Weber

Siebert

et al. 2010

Metall Mater Trans A

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The processing of plastics, particularly reinforced composites, necessitates the use of corrosion-and wear-resistant materials for tools that come into contact with the polymer. For such applications, plastic mold steels were developed that offer not only a good wear resistance due to the presence of carbides in a martensitic matrix, but also good corrosion resistance provided primarily by a sufficient amount of dissolved chromium. The common processing route for these high-alloyed materials is the hot isostatic pressing (HIP) of gas-atomized powders (PM-HIP). In this context, sintering plays an insignificant role, except for the processing of metalmatrix composites (MMCs). The development of novel wear-and corrosion-resistant MMCs based on plastic mold steels requires knowledge of the sintering behavior of prealloyed powders of such tool steels. It is well known that alloyed powders can be processed by supersolidus liquidphase sintering (SLPS), a method leading to almost full densification and to microstructures without significant coarsening effects. In this work, two different gas-atomized powders of plastic mold steels were investigated by computational thermodynamics, thermal analysis, sintering experiments, and microstructural characterization. The results show that both powders can be sintered to almost full density (1 to 3 pct porosity) by SLPS in a vacuum or a nitrogen atmosphere. Experimental findings on the densification behavior, nitrogen uptake, and carbide volume fractions are in good agreement with calculations performed by computational thermodynamics.

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“…Following this postulation, it is likely that different second phases, such as oxides, nitrides, and carbides, may provide the Zener pinning effect and inhibit the grain growth of tool steels and decrease the structure softening index f. Several previous studies have reported that some carbides, such as TiC and VC, are useful in inhibiting the grain size and enlarging the sintering window. [13][14][15][16][17][18][19][20] However, not all carbides are effective, and different levels of success have been reported, depending on the baseline alloys and types of carbides. The M 7 C 3 carbide in the SKD11 completely dissolves in the liquid phase at 1523 K (1250°C), as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Preservation of Geometrical Integrity of Supersolidus-Liquid-Phase-Sintered SKD11 Tool Steels Prepared with Powder Injection Molding

Chuang

Hwang

2010

Metall Mater Trans A

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The powder injection molded SKD11 tool steels often manifest shape retention problems during supersolidus liquid phase sintering due to the difficulties in controlling the amount of liquid phase. The typical temperature range for the sintering of SKD11 is only 10 K, between 1503 and 1513 K (1230 and 1240°C), and this narrow sintering range demands a special furnace with very uniform temperature distribution. Through the addition of carbides, in particular TiC, this problem is resolved by enlarging the liquid + c + carbide region in the phase diagram and by impeding the grain growth with the carbides. The resulting sintering window is broadened to 40 K, between 1513 and 1553 K (1240 and 1280°C). The relevant mechanisms on the improvement of shape retention are discussed with a focus on the effect of carbide addition on the changes in the phase diagram and the microstructure. A guideline for the selection of effective carbides is also proposed based on the experimental results and the phase diagram analyses.

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Increasing Sintering Gate and Avoiding Grain Growth in High Speed Steels by Sintering in Nitrogen Rich Atmospheres

Cited by 20 publications

References 3 publications

Development of powder metallurgy T42 high speed steel for structural applications

Development of powder metallurgy T42 high speed steel for structural applications

Comprehensive Investigations of the Supersolidus Liquid-Phase Sintering of Two Plastic Mold Steels

Preservation of Geometrical Integrity of Supersolidus-Liquid-Phase-Sintered SKD11 Tool Steels Prepared with Powder Injection Molding

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