Properties of powder and cast R6M5K5 high-speed steel

Gulyaev, A. P.; Tolkacheva, E. P.; Sergienko, L. P.

doi:10.1007/bf00795679

Cited by 3 publications

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“…High-speed steels are used for applications requiring long life at relatively high operating temperatures such as for heavy cuts or high-speed machining. High-speed steels are the most important alloy tool steels because of their very high hardness and good wear a resistance in the heat-reacted condition and their ability to retain high hardness and the elevated temperatures often encountered during the operation of the tool at high cutting speeds [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Calculation for Silicon ModifiedAISI M2 High Speed Tool Steel

Halfa¹

2013

JMMCE

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During high speed tool steel production up to 0.2 wt % silicon is added, primarily to react with oxygen e.g. silicon acts as a de-oxidizer. If more than 0.2 wt % silicon is added, it serves to improve the deep hardening properties. An addition up to ~1 wt % silicon provides hardness and improves temper-stability but reduces the ductility. At high concentration, silicon causes embrittlement. Alloying with silicon raises the solubility of carbon in the matrix and hence the as-quenched hardness. It has virtually no influence on the carbide distribution, but it promotes the formation of M 6 C type carbides. The many essential alloy additions to iron (C, W, Mo, V, Cr, Si) make the high speed tool steel, HSS a complex multi-component system. Its complete experimental investigation would require enormous time and effort. Instead, the CALPHAD method has been successfully used for computation of phase equilibrium the multi-component HSS system. In the present work, the Thermo-Calc program has been applied to the system Fe-C-Cr-W-Mo-V-Si with the thermodynamic information contained in the solid-solution-database of the TCFE. In the present work, some temperature-concentration diagrams for silicon modified AISI M2 steel are presented by calculated quantities (melting and transformation temperatures, amount and compositions of phases). Calculated data are compared with standard AISI M2 high speed tool steel.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Calculation for Silicon ModifiedAISI M2 High Speed Tool Steel

Halfa¹

2013

JMMCE

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Process of vacuum hardening of cutting and sharpening tools of high-speed steels in belt furnaces

Tarasovi

1996

Met Sci Heat Treat

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Vacuum carbonitriding of small-dimension tools formed from high-speed powder steel in low-energy muffle furnaces

Tarasov¹

1994

Met Sci Heat Treat

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Vacuum casehardening (VCH) has come into increasingly widespread use in industry due to a number of advantages." the production of a clean unoxidized component surface, reduction in allowances for finish machining, improvement in ecology, and a reduction in outlays for electric energy, equipment, and accessory nlaterials. A procedure for the vacuunl carbonitriding of tools formed from high-speed powder steels in active soot-fiee liquid carburizers is discussed in this paper.Use of high-speed powder steels for the fabrication of special cutting and shaping tools is economically and technically founded [1][2][3], but requires the fulfillment of a number of technological characteristics and special procedures for the heat treatment, pressing, and casehardening [3][4][5][6].Theoretical and practical positions set forth in [5][6][7][8][9] and data on the vacuum treatment of individual types of tools fabricated from high-speed steels [10][11] were employed in evaluating the possibility of using vacuum heat treatment and vacuum casehardening for thin-edge and small-dimension shaping tools formed from powder steels R6M5-P and R6M5K5-MP.Modernized SShOL-1,6.1/1211 and SShOL-1,8,1,2/12M2 furnaces with "hot" retorts were used to conduct vacuum carbonitriding in atmospheres produced by the pyrolysis of liquid monoethanolamine-and triethanolamine-base carburizers with additives of vat residues from the regeneration of ethyl alcohol and vacuum hardening in the 860-1120°C interval. A rough drawing of a steel 12KH18N10T vacuum retort with a system of vacuum inlets and outlets and a device to weight the feed of liquid carburizer is shown in Fig. 1. The vacuum in the metallic muffle was varied from 0.133 to 425 Pa by varying the consumption of liquid mixtures fed through the needle valve of the weighing device. Cooling at various rates was accomplished by varying the nitrogen or argon delivery to the working space, and by moving the muffle into the air in accordance with the scheme outlines by Hesse [12], as well as by transporting the specimens and tools through the air into oil and slat melts.Specimens for a metallographic, x-ray-structural analysis and bending-and impact-strength testing, as well as smalldimension dies, master punches, and die plates were fabricated from extruded bars, strips, and forgings of powder steels R6M5-P, R6M5F3-MP, ROM6F3-MP, and R6M5K5-MP in accordance with Technical Specification 14-1-2988-80 and Technical Specification 14-1-2804-79. The chemical composition of the blanks is presented in Table I. hwestigated of the microstructure and x-ray-structural analysis of specimens treated in accordance with the different regimes were carried out layer-by-layer by grinding off the 40-50-/2m thick diffusion layer. Fractographic and micro-x-rayspectral analysis of the distribution of elements over the cross section of the specimens after impact-bending tests were carried out on a "Camebax" unit. The regimes employed for the vacuum carbonitriding of the high-speed powder steel in atmospheres produced by the pyr...

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Properties of powder and cast R6M5K5 high-speed steel

Cited by 3 publications

References 0 publications

Thermodynamic Calculation for Silicon ModifiedAISI M2 High Speed Tool Steel

Thermodynamic Calculation for Silicon ModifiedAISI M2 High Speed Tool Steel

Process of vacuum hardening of cutting and sharpening tools of high-speed steels in belt furnaces

Vacuum carbonitriding of small-dimension tools formed from high-speed powder steel in low-energy muffle furnaces

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