Einfluß des Siliciumgehaltes auf die Gefügeausbildung eines Schnellarbeitsstahles der Sorte S 6-5-2

Brandis, Helmut; Haberling, Edmund; Ortmann, R.; Weigand, Hans Hermann

doi:10.1002/srin.197705042

Cited by 4 publications

(4 citation statements)

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“…With respect to thermal stability, M 6 C and MC eutectic carbides are considered as stable phases, 41 whereas M 2 C eutectic carbide is known to be a metastable one, which, 6 Morphologies of a fishbone, c rod-like and e lamellar eutectics and b, d, f distribution of V in as cast microstructure at elevated temperature, decomposes into M 6 CzMC products according to the formula M 2 CRM 6 CzMC. 40 This was also reported 39 as M 2 CzFe(c)RM 6 CzMC and in the complete form as M 2 CzcRM 6 CzMC zazC. It should be emphasised that the latter formula reflects the participation of the matrix in the process.…”

Section: Microstructure Evaluation After Complete Heat Treatmentmentioning

confidence: 80%

“…As can be seen from Table 3, the Cr and primarily V contents in the M 6 C carbide are distinctly lower compared to those of the M 2 C carbide, and Fe content is significantly greater in the case of the M 6 C. The M 2 C carbide with lamellar morphology, in comparison to the M 2 C carbide with rod-like morphology, has somewhat higher content of V. Compared to the chemical compositions of the M 6 C and M 2 C carbides the composition of MC carbide differs by substantially higher level of V. The origin and specific chemical composition of the eutectic carbides formed in the as cast microstructure is known to control their behaviour during heat treatment. [29][30][31][32][33][34][35][36][37][38][39][40]…”

Section: Microstructure Evaluation In As Cast Statementioning

confidence: 99%

“…The microstructural changes occurring in different HSSs during heat treatment, in the context of M 2 C carbide decomposition, have been thoroughly studied in numerous works, but, as a rule, only in relation to annealing or hot-working of metallurgical ingots, 31,32,37,38,40 and very rarely in relation to austenitising. 35 Much more detail on the specific features of the M 2 C carbide decomposition concerning the HSSs inoculated with powder TiB 2 and W can be found elsewhere.…”

Section: Microstructure Evaluation After Complete Heat Treatmentmentioning

confidence: 99%

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Microstructural and properties evaluation of M2 high speed steel after inoculating addition of powder W and WC

Чаус

2014

Materials Science and Technology

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Melt treatment methods that involve the addition of small amounts of surface-active or/and inoculating elements have permitted the development of improved high speed steels (HSSs) with greater carbide control. In this work, addition of powdered W and WC into the melt was used to improve the as cast microstructure of AISI M2 HSS and, as consequence, its properties after full heat treatment. Under the action of inoculants, there was a refinement of the primary grains of the matrix and a transition from a columnar dendritic mode of solidification (typically found in uninoculated AISI M2) to a predominantly equiaxed morphology in the inoculated steels. SEM and EDS confirmed that the inoculation favoured the formation of the M 6 C eutectic at the expense of the M 2 C and MC variants, which prevailed in the as cast microstructure of the uninoculated steel. The relationship between microstructure and the properties is discussed.

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Section: Microstructure Evaluation After Complete Heat Treatmentmentioning

confidence: 80%

Section: Microstructure Evaluation In As Cast Statementioning

confidence: 99%

Section: Microstructure Evaluation After Complete Heat Treatmentmentioning

confidence: 99%

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Microstructural and properties evaluation of M2 high speed steel after inoculating addition of powder W and WC

Чаус

2014

Materials Science and Technology

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“…The traditional high speed tool steels contain a high amount of carbon and other alloying elements with different functions: Cr is responsible for the formation of different types of carbides depending on the exact processing temperature [2][3][4][5]. These phases dissolve during austenitization in the sequence M 23 C 6 , M 7 C 3 , M 6 C, MC [6], or according to [7] in the sequence M 7 C 3 , M 23 C 6 , MC, M 2 C, and/or M 6 C. These Cr and C containing phases are responsible for the great hardenability of high speed steels [8] caused by the formation of secondary carbides after the heat treatment. Mo and W lower the solidus temperature and together with Fe form the M 6 C carbides [9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Properties, and Thermal Stability of Carbon-Free High Speed Tool Steel Strengthened by Intermetallics Compared to Vanadis 60 Steel Strengthened by Carbides

Michalcová

Pečinka

Kačenka

et al. 2021

Metals

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High speed tool steels are materials that exhibit superior mechanical properties (e.g., high hardness). They should also be resistant to thermal exposure to maintain high hardness during the machining process. In this paper, a C-free tool steel formed of Fe matrix and a Mo6Co7 intermetallic phase was studied. This steel was compared to the well-known Vanadis 60 steel containing Fe matrix and carbides. Microstructures were investigated by scanning (SEM) and transmission (TEM) electron microscopy, and the mechanical properties and thermal stability of both materials were compared. It was proven that the strengthening in the Vanadis 60 steel was mainly caused by the carbides, while the C-free steel was strengthened by the Mo6Co7 phase. The hardness values of both materials were comparable in the utilization state (approx. 950 HV). The hardness of Vanadis 60 steel decreased after several minutes of annealing at 650 °C under the value that enables material utilization. The hardness value of the steel strengthened by the intermetallics also decreased but significantly slower. Based on these results, the main finding of this study is that the C-free steel exhibited much better thermal stability and may be utilized at higher temperatures for longer periods of time than Vanadis 60.

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Paper, honoured with the Sir Charles Hatchett Award by the Institute of Metals, London: Developments in high speed tool steels

Riedl¹,

Karagöz

Fischmeister

et al. 1987

Steel Research

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This paper describes a research programme at the Austrian School of Mines (Montanuniversität) at Leoben, carried out since 1981 in cooperation with the Max‐Planck‐Institute for metals research in Stuttgart, on the fundamentals of alloy design for high speed tool steels. Among the results, the development of niobium‐alloyed grades has an important place. Controlled solidification studies with a gradient technique have clarified the influence of various alloying elements on the as‐cast microstructure of ledeburitic tool steels. A procedure for accurate quantitative metallography in SEM, combined with EDX and STEM‐EDX analysis of the chemical compositions of the carbide and matrix phases, has led to a quantitative model for the performance of high speed steels in metal cutting tools, in which the contributions of carbides and of the matrix are combined using empirically determined weight factors. An important role is played by the saturation of the matrix with vanadium and other carbide formers which are essential for secondary hardening. This saturation is related to the way in which these carbide formers are present in the annealed structure; this in turn is influenced decisively by the solidification path (via M6C or M2C) of the alloy. On the basis of these concepts, low alloyed, niobium‐containing economy grades have been developed whose performance is comparable to that of commercial high speed steels, and perspectives for the development of economic super high speed steels with niobium as an alloying element are indicated.

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Einfluß des Siliciumgehaltes auf die Gefügeausbildung eines Schnellarbeitsstahles der Sorte S 6-5-2

Cited by 4 publications

References 1 publication

Microstructural and properties evaluation of M2 high speed steel after inoculating addition of powder W and WC

Microstructural and properties evaluation of M2 high speed steel after inoculating addition of powder W and WC

Microstructure, Mechanical Properties, and Thermal Stability of Carbon-Free High Speed Tool Steel Strengthened by Intermetallics Compared to Vanadis 60 Steel Strengthened by Carbides

Paper, honoured with the Sir Charles Hatchett Award by the Institute of Metals, London: Developments in high speed tool steels

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