Hardfacing of metal-cutting tools by arc welding in vacuum

2020 ◽  
Vol 2 (99) ◽  
pp. 49-56
Author(s):  
N.V. Ferdinandov ◽  
D.D. Gospodinov
Keyword(s):  
Wear Resistance ◽  
Heat Resistance ◽  
Arc Welding ◽  
High Speed ◽  
Metal Cutting ◽  
Microstructural Analysis ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Heat Treated ◽  
Better Than

Purpose: To present a technology for hardfacing of metal-cutting tools by arc welding in vacuum. Design/methodology/approach: The experiments were carried out using an installation for arc welding in vacuum. Objects of research were metal cutting tools (lathe knives), made of high-speed steel HS6-5-2 on a base metal of structural steel C45. The structure, hardness and wear resistance after hardfacing and after a triple tempering at 560°C have been determined. The heat resistance of the obtained instruments has been examined. Findings: The microstructural analysis showed that the structure of the built-up layer consisted of martensite, retained austenite and carbides. This was confirmed by the values of measured hardness after welding which were about 63-64 HRC. The triple tempering led to an increase in hardness by 3-4 HRC. It was found that the built-up layers (cutting edges of tools) retain their hardness (HRC=63-65) up to a temperature of 615-620°C, which shows that the heat resistance of the build-up layers was similar to that of the hardened and tempered tools of the same steel. The built-up work-pieces (excluding heat treated) and the reference knife showed the same cutting qualities at cutting speeds in the range of 55 to 120 m/min. It has been found that triple tempering after hardfacing led to increased wear resistance and consequently the durability of the tool also increased due to the higher hardness. Practical implications: The practical application is related to the production of metalcutting tools. Originality/value: The proposed technological method allows to produce defects free built-up layers. The cutting properties of the built-up in vacuum layers are comparable to or better than those of new tools made of steel HS 6-5-2.

A Promising Method for Improving Wear Resistance of Metal Cutting Tools

2015 ◽  
Vol 788 ◽  
pp. 325-329
Author(s):  
Alexander G. Ovcharenko ◽  
Andrey Yu. Kozlyuk ◽  
Mikhail O. Kurepin
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Metal Cutting ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Practical Interest ◽  
High Speed Steel ◽  
Promising Method ◽  
Steel R6m5 ◽  
Machine Parts

Abstract. A promising method for improving wear resistance of metal cutting tools including pre-heating and a subsequent impact of the pulsed magnetic field of high intensity on the cutting tool is proposed. The experimental setup and methods of research are described. Experimental studies of surfaces of carbide reversible cutting plates of the VK8, T15K6 alloy and drills of high speed steel R6M5 to assess the effectiveness of the proposed method were performed. An increase in wear resistance of cutting tools made of the T15K6 hard-alloy plates by 30% and made of the VK8 alloy plates by 13% was revealed while wear resistance of drills made of steel R6M5 increased on average by 58% The proposed method can be of practical interest for hardening the surface of other types of tools and machine parts for further experimental verification.

Development of High-Speed Steels for Cast Metal-Cutting Tools

2006 ◽  
Vol 113 ◽  
pp. 559-564 ◽  
Author(s):  
Alexander S. Chaus ◽  
J. Chovanec ◽  
M. Legerská
Keyword(s):  
Impact Toughness ◽  
High Speed ◽  
Metal Cutting ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Eutectic Carbides ◽  
Alloying System ◽  
Heat Treated ◽  
Similar Chemical ◽  
The Impact

As-cast high-speed steels heat-treated have completely much lower impact toughness than that of the steels of a similar chemical composition but undergone hot working – rolling or forging. That is attributed to the influence of eutectic carbides, which especially being coarse, provide easily brittle intergrain fracture sites under low stress intensity factor levels. This is especially real for cast cutting tools. In order to exhibit good all-round performance the impact toughness enhancement of as-cast high-speed steels is obligatorily needed. In this connection it is expedient to turn from high-speed steels of conventional ledeburitic origin to high-speed steels of hypereutectoid and ferritic-carbidic ones with considerably lower carbide heterogeneity resulting in enhanced impact toughness. In the present work special features of the structure, phase composition and properties of such high-speed steels designed for cast tool are studied. In order to substitute tungsten by chromium in as-cast high-speed steel a special alloying system has also been developed.

Hardening of Selective Laser Melted M2 Steel

2021 ◽  
Author(s):  
Mei Yang ◽  
Yishu Zhang ◽  
Haoxing You ◽  
Richard Smith ◽  
Richard D. Sisson
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
Cutting Tools ◽  
High Speed Steel ◽  
High Hardness ◽  
Steel Part ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Near Net Shape

Abstract Selective laser melting (SLM) is an additive manufacturing technique that can be used to make the near-net-shape metal parts. M2 is a high-speed steel widely used in cutting tools, which is due to its high hardness of this steel. Conventionally, the hardening heat treatment process, including quenching and tempering, is conducted to achieve the high hardness for M2 wrought parts. It was debated if the hardening is needed for additively manufactured M2 parts. In the present work, the M2 steel part is fabricated by SLM. It is found that the hardness of as-fabricated M2 SLM parts is much lower than the hardened M2 wrought parts. The characterization was conducted including X-ray diffraction (XRD), optical microscopy, Scanning Electron Microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) to investigate the microstructure evolution of as-fabricated, quenched, and tempered M2 SLM part. The M2 wrought part was heat-treated simultaneously with the SLM part for comparison. It was found the hardness of M2 SLM part after heat treatment is increased and comparable to the wrought part. Both quenched and tempered M2 SLM and wrought parts have the same microstructure, while the size of the carbides in the wrought part is larger than that in the SLM part.

scholarly journals Tribological properties of ion-modified composite coatings

2021 ◽  
Vol 2059 (1) ◽  
pp. 012015
Author(s):  
M Sh Migranov ◽  
A M Migranov ◽  
S R Shekhtman
Keyword(s):  
Wear Resistance ◽  
Tool Life ◽  
High Speed ◽  
Composite Coatings ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Hard Coating ◽  
Ion Nitriding ◽  
Additional Layer ◽  
Nitrided Surface

Abstract The paper presents the results of a study of one of the ways to increase the wear resistance of “duplex” coatings applied to cutting tools, which are due to preliminary diffusion saturation of the tool surface with nitrogen (known as ion nitriding) followed by physical deposition of a hard coating (Ti, Cr) N. The proposed coating also contains an additional layer with an impurity of ions, deposited on a preliminary nitrided surface of high speed steel before the deposition of a hard coating. Tests were carried out to evaluate the effect of these modified layers on the tool life of the HSS tool. The greatest wear resistance after "triplex" - treatment was achieved during ion implantation of titanium into a pre-nitrided surface. The coefficient of friction of the modified layer was studied at different contact temperatures. Ionic mixing contributes to the appearance of a thin surface layer with an amorphous-like structure, which prolongs the stage of normal wear, which significantly increases the tool life as a result of the self-organization process.

Wear-Resistance of Nitrided W-Mo-High Speed Steel in Abrasive Wear Conditions

2013 ◽  
Vol 594-595 ◽  
pp. 1117-1121
Author(s):  
Мazhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Merey Rakhadilov
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Abrasive Wear ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Abrasive Wear Resistance ◽  
R6m5 Steel

In this work the influence of electrolytic-plasma nitriding on the abrasive wear-resistance of R6M5 high-speed steel were under research. We registered that after electrolytic-plasma nitriding on R6M5 steel surface modified layer is formed with 20-40 μm thickness and with increased microhardness of 9000-12200 MPa. Testing mode for the nitrided samples high-speed steel on abrasive wear developed. It is established, that electrolyte-plasma nitriding allows to increase wear-resistance of R6M5 steel surface layer comparing to original. It was determined that abrasive wear-resistance of R6M5 steel surface layer is increased to 25% as a result of electrolytic plasma nitriding. Thus, studies have demonstrated the feasibility and applicability of electrolytic-plasma nitriding in order to improve cutting tools work resource, working under friction and wear conditions.

VASCODYNE

Alloy Digest ◽  
1984 ◽  
Vol 33 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Metal Cutting ◽  
Lower Cost ◽  
Cutting Tool ◽  
High Speed Steel ◽  
Heat Treating ◽  
Hot Hardness

Abstract VascoDyne is a high-speed steel for the metal-cutting industry. This steel is designed to give equivalent or better performance than many grades of high-speed steel now in use and at a lower cost. VascoDyne provides improved hot hardness and wear resistance over conventional high-speed steels such as AISI Types, M1, M7 and M10. VascoDyne is recommended as an excellent alternate to the traditional high-speed steels used in cutting-tool applications. This datasheet provides information on composition and hardness. It also includes information on forming, heat treating, and machining. Filing Code: TS-431. Producer or source: Teledyne Vasco.

Wear resistance of high-speed steel cutting tools

2012 ◽  
Vol 32 (2) ◽  
pp. 186-188 ◽  
Author(s):  
V. M. Kishurov ◽  
V. N. Ippolitov ◽  
M. V. Kishurov
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Steel Cutting

Wear resistance of coated high-speed steel cutting tools

2012 ◽  
Vol 32 (1) ◽  
pp. 98-101
Author(s):  
V. M. Kishurov ◽  
V. N. Ippolitov ◽  
M. V. Kishurov ◽  
M. Yu. Nekrasova
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Steel Cutting

AISI TYPE M42

Alloy Digest ◽  
1987 ◽  
Vol 36 (5) ◽  
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
High Speed Steel ◽  
High Hardness ◽  
Heat Treating ◽  
Steel Mills ◽  
Aisi Type ◽  
Heat Treated ◽  
Edge Toughness ◽  
Hot Hardness

Abstract AISI Type M42 is capable of being heat treated to Rockwell C 68-70; in fact, it is a super high-speed steel. Its combination of composition and properties makes it suitable for machining high-hardness alloys and difficult-to-machine superalloys. Excellent wear resistance and high hot hardness are obtained in Type M42 without loss of cuttting-edge toughness. Typical tools made from this steel are broaches, drills, gear cutters and milling cutters. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-476. Producer or source: Tool steel mills.

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