Fabrication methods and heat treatment conditions effect on tribological properties of high speed steels

Dobrzański, L. A.; Matula, G.; Várez, A.; Levenfeld, B.; Torralba, J. M.

doi:10.1016/j.jmatprotec.2004.09.051

Cited by 17 publications

(18 citation statements)

References 8 publications

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“…These results are presented in the article [8], where the temperature of the beginning of PW degradation is 198°C. Two characteristic temperatures on the thermogravimetric curve of the EVA result from the fact that it is a copolymer of ethylene and vinyl acetate.…”

Section: Resultsmentioning

confidence: 99%

“…Powder was mixed with a two-component binder basis on paraffin (PW) and the backbone polymer or blend. Paraffin is used to lower the viscosity of the polymerpowder slurry and possibility use solvent degradation [8].…”

Section: Methodsmentioning

confidence: 99%

“…This technology requires the use of a precisely selected binder which not only plays an important role in injection moulding process but also can not cause contamination resulting from the binder removal process, which would lower the functional properties. Binder degradation products in the injection moulding process often contribute to the sintering process by lowering the solidus temperature of the alloy, e.g., highspeed steel, but excessive carbonation may increase the content of retained austenite [8][9][10]. The part of research results presented in the article mainly concerns the selection of binder components and their share in relation to the powder [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Application of thermal analysis in the selection of polymer components used as a binder for metal injection moulding of Co–Cr–Mo alloy powder

Matula

Tomiczek

Król

et al. 2018

J Therm Anal Calorim

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To produce the polymer-powder slurry for injection moulding the thermoplastic polymers such as polypropylene, highdensity polyethylene and ethylene-vinyl acetate were used. Depending on skeletal polymers, in every feedstock paraffin wax (PW) was used in the amount of 50% of binder. Application of PW gives the possibility using solvent debinding or thermal debinding at a lower temperature. Then the open porosity into the injected samples reduces the time of thermal debinding of binder residue. Application of one type of skeletal polymer requires using a long isothermal step. The use of a blend of skeletal polymers enables subsequent thermal degradation which consecutively removes skeletal polymers during the heating to the sintering temperature, to minimise the time of isothermal stops. The rheological properties of blends used as a binder and next feedstocks were investigated during mixing in the twin-screw extruder and capillary rheometer. This results gives the information about the possibility to produce feedstocks and then to their injection moulding. Thermal behaviour of samples was determined by differential scanning calorimetry and thermogravimetric analysis to obtain the information about the temperature of mixing the polymers and to propose the thermal debinding cycle.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of thermal analysis in the selection of polymer components used as a binder for metal injection moulding of Co–Cr–Mo alloy powder

Matula

Tomiczek

Król

et al. 2018

J Therm Anal Calorim

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show abstract

“…The sintering of injection-moulded high-speed steels in high vacuum is quite difficult due to the gas products being released, coming from the thermal degradation of base polymer residues. Final heat treatment is required to achieve high mechanical properties for high-speed steels or sintered carbides manufactured by PIM [34][35][36][37][38].…”

Section: Overview Of Powder Injection Moulding As Specialist Powder Mmentioning

confidence: 99%

Powder Injection Moulding of Tool Materials and Materials Containing One-Dimensional Nanostructural Elements

Dobrzański¹,

Matula²

2017

Powder Metallurgy - Fundamentals and Case Studies

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As modern manufacturing methods have been developing, the application methods of powders have changed, and they do not always have to be moulded prior to sintering. The powder injection moulding (PIM) method is suitable for large-lot and mass production; still, powder consumption is not too high. The metal injection moulding (MIM) is an advanced technology and not as developed as classical pressing and sintering but constantly and dynamically developing. The technology is developing towards micro-MIM, that is, production of very small parts for miniaturised devices. The chapter presents the overview of powder injection moulding as specialist powder metallurgy method and its application for fabrication of tool materials. Specially, the fabrication of high-speed steels and carbide-steels on their matrix by powder injection moulding is descripted. In last part of the chapter, the results of own investigations of the structure with nanostructural elements of high-speed steels and carbide-steels on their matrix fabricated by powder injection moulding are presented.

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“…With regard to their application, such materials can be divided into, notably, functionally graded materials [22,26], tool gradient materials (TGM) [28][29][30][31][32][33][34][35][36], gradient biomaterials and functionally graded piezoelectric materials (FGPM). Gradient materials, according to the type of combined materials, can be grouped into, particularly [37]: metal material-ceramic material, metal material-metal material, ceramic material-ceramic material, polymer material-ceramic material.…”

Section: General Concept Of Sintered Gradient Materialsmentioning

confidence: 99%

Fabrication, Structure, Properties and Application of Gradient Sintered Carbide-Steels with HS6-5-2 Matrix

Dobrzański¹,

Kloc-Ptaszna²

2017

Powder Metallurgy - Fundamentals and Case Studies

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This chapter presents essential information concerning sintered tool materials containing carbides, i.e. high-speed steels and metal matrix composites, including sintered carbides and carbide steels. Gradient materials, whose properties change gradually according to their volume, are characterised. The results of investigations are presented in the final part into the structure and properties of newly developed sintered graded tool materials fabricated by the conventional metallurgy method from a mixture of high-speed HS6-5-2 steel powder and WC carbides. Investigations are described for four-layer materials, where the successive transition layers with a smaller and smaller volume fraction of tungsten carbide were constituted from the surface layer side, until a substrate layer containing high-speed HS6-5-2 steel only. The outcomes are described of structural examinations in a scanning and transmission electron microscope, an X-ray microanalysis and the results of density, porosity and hardness examinations of sintered gradient materials and the results of structure and hardness examinations of heat-treated materials.

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Fabrication methods and heat treatment conditions effect on tribological properties of high speed steels

Cited by 17 publications

References 8 publications

Application of thermal analysis in the selection of polymer components used as a binder for metal injection moulding of Co–Cr–Mo alloy powder

Application of thermal analysis in the selection of polymer components used as a binder for metal injection moulding of Co–Cr–Mo alloy powder

Powder Injection Moulding of Tool Materials and Materials Containing One-Dimensional Nanostructural Elements

Fabrication, Structure, Properties and Application of Gradient Sintered Carbide-Steels with HS6-5-2 Matrix

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