Improving the mechanical properties of tool steel by induction chemical-thermal treatment

Abstract The study results of the structure and microhardness of the surface layer of high-speed tool steel after induction chemical-thermal treatment in a gaseous nitrogen-containing medium at a temperature of 900–1100 °C were presented. Due to the strengthening treatment of products a gradient diffusion nitride layer with a thickness of about 200 μm and a surface microhardness of 1950±70 HV1 98 was formed.

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Study Regarding the Properties of a Knife from a Grinding Mill Obtained from Metallic Powders

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.34.60 ◽

2019 ◽

Vol 34 ◽

pp. 60-65

Author(s):

Mihai Demian ◽

Claudiu Nicolicescu ◽

Gabriela Demian ◽

Stefan Radu

Keyword(s):

Mechanical Properties ◽

Wear Resistance ◽

Thermal Treatment ◽

Tool Steel ◽

Initial Sample ◽

Metallic Powders ◽

Tempering Treatment ◽

Measured Hardness ◽

Grinding Mill

In the paper is presented the analysis of tool steel used for making a knife for a mill for grinding plants. The material used for the knife is about 1% carbon and is symbolized by RWL34. To improve the properties of the material, especially the knife cut, a thermal treatment were made and was measured hardness, wear resistance and microscopic analyzes of the metal. The paper presents the values of the mechanical properties on the initial sample, on the hardening sample and on the sample subjected to a hardening and tempering treatment, as well as the graphs related to them. The next step in finalizing the analysis of the grinder mill knife is to study the behavior in operation and the possible corrections that should be made.

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1107 Effect of sputter cleaning on mechanical properties of high speed tool steel

The Proceedings of Conference of Kansai Branch ◽

10.1299/jsmekansai.2006.81._11-7_ ◽

2006 ◽

Vol 2006.81 (0) ◽

pp. _11-7_

Author(s):

Hirotaka TANABE ◽

Yoshio MIYOSHI ◽

Tohru TAKAMATSU ◽

Tomoyuki MATSUMOTO

Keyword(s):

Mechanical Properties ◽

Tool Steel ◽

High Speed

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Study of medium-carbon steels structure after electromechanical processing

10.36652/1813-1336-2020-16-10-473-477 ◽

2020 ◽

pp. 473-477

Author(s):

Yu.S. Ivanova ◽

V.N. Zaripov ◽

Ngo Van Tuyen ◽

Myat Soe Lwin ◽

Ye Kyaw Oo

Keyword(s):

Surface Layer ◽

High Speed ◽

Heat Stability ◽

Carbon Steels ◽

Original Structure ◽

Surface Microhardness ◽

Medium Carbon ◽

Wide Range ◽

Medium Carbon Steels ◽

40Cr Steel

The results of the microstructure and microhardness of the surface layer of medium-carbon 40Cr, 38CrNi3MoA steels after electromechanical processing are presented. The results of tests on the heat stability of samples made of 38CrNi3MoA steel when they are consistently heated from 150 to 550 °C, in the temperature range of 50 °C are presented. The samples are heated in muffle furnaces with exposure at each temperature of 10 min and cooled in air. The heat stability of the surface layer after electromechanical processing is controlled by changes in microhardness. The results of the microstructure indicate the formation of fine martensite and retained austenite in the upper layers of the quenching zones. High speed heating of local volume of the surface with parallel thermoplastic shaping by work-hardening tool and following high-intensity cooling through heat rejection in deep into work material take place in the time of electromechanical processing. The structure of sorbite is form in the overlap zone of electro-mechanical hardening and in the transition near original structure section. The average surface microhardness of the 40Cr steel samples before hardening is HV = 2000...2400 MPa, after electromechanical hardening — HV = 6640 MPa, and the 38CrNi3MoA steel samples before hardening is HV = 2000...2200 MPa, after electromechanical hardening — HV = 7060 MPa. The graded layer has hardening depth to 0.8 mm with stepwise degradation of hardness is detected. The research results show that using electromechanical processing in the manufacture of wide range of parts in order to increase the wear resistance of the surface layer.

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

Metals ◽

10.3390/met11121901 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1901

Author(s):

Alena Michalcová ◽

Vojtěch Pečinka ◽

Zdeněk Kačenka ◽

Jan Šerák ◽

Jiří Kubásek ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Tool Steel ◽

High Speed ◽

Intermetallic Phase ◽

High Hardness ◽

Thermal Exposure ◽

Machining Process ◽

Material Utilization ◽

Thermal Stability Of

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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Effect of diffusion borochromizing on microstructure, microhardness and corrosion resistance of tool steel with different carbon content

Journal of Achievements of Materials and Manufacturing Engineering ◽

10.5604/01.3001.0010.2025 ◽

2017 ◽

Vol 2 (80) ◽

pp. 49-55 ◽

Cited By ~ 1

Author(s):

A. Bartkowska ◽

D. Bartkowski ◽

A. Piasecki

Keyword(s):

Corrosion Resistance ◽

Surface Layer ◽

Carbon Content ◽

Tool Steel ◽

Powder Mixture ◽

Design Methodology ◽

Nacl Solution ◽

Study Results ◽

Potentiodynamic Method ◽

Resistance Tests

Purpose: The aim of this paper is presents the study results concerning influence of carbon content on the surface layer condition, microstructure, microhardness and corrosion resistance of diffusion borochromized layer. Design/methodology/approach: In paper the three types of tool steel were analysed: CT90, 145Cr6 and 165CrV12. The borochromzing process was carried out in a powder mixture containing B4C, Fe-Cr, Al2O3 at temperature 950°C for 6 h. The source of chromium was Fe-Cr while the source of boron was B4C. Findings: As a result of borochromizing process the layer with microstructure similar to boronized layer was obtained. The thickness of the resulting surface layer was dependent on the carbon content of steel. Microhardness of the borochromized layer was similar to the microhardness of the boronized layer. Additionally the corrosion resistance tests in 5% NaCl solution were performed using a potentiodynamic method. It was found that the best corrosion resistance was characterized a layer on the steel with less carbon content. Originality/value: Value of the paper is analysis of corrosion resistance by potentiodynamic method of the tool steel with borochromized layer.

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Change of Structure and Mechanical Properties of R6M5 Steel Surface Layer at Electrolytic-Plasma Nitriding

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1040.753 ◽

2014 ◽

Vol 1040 ◽

pp. 753-758 ◽

Cited By ~ 6

Author(s):

Mazhyn Skakov ◽

Bauyrzhan Rakhadilov ◽

Erlan Batyrbekov ◽

Michael Scheffler

Keyword(s):

Mechanical Properties ◽

Surface Layer ◽

High Speed ◽

Steel Surface ◽

Plasma Nitriding ◽

Cutting Tools ◽

High Speed Steel ◽

High Hardness ◽

R6m5 Steel ◽

Temperature Plasma

In the article changes in the structure and mechanical properties of R6M5 steel surface layer after electrolytic-plasma nitriding are shown. The optimal mode of electrolytic-plasma nitriding of R6M5 high-speed steel in electrolyte based on carbamide, which allows saturation of the surface with nitrogen from low-temperature plasma and get the modified layer of high hardness and wear-resistance. It is established, that after electrolytic-plasma nitriding reduced R6M5 steel wear rate and increases its resistance to abrasive wear. Perspectivity of use an electrolytic-plasma nitriding method to improve performance cutting tools made from R6M5 steel is shown.

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Plasma immersion N and N+C implantation into high-speed tool steel: surface morphology, phase composition and mechanical properties

Surface and Coatings Technology ◽

10.1016/s0257-8972(01)01052-0 ◽

2001 ◽

Vol 142-144 ◽

pp. 406-411 ◽

Cited By ~ 5

Author(s):

V.V Uglov ◽

V.M Anishchik ◽

A.K Kuleshov ◽

J.A Fedotova ◽

N.T Kvasov ◽

...

Keyword(s):

Mechanical Properties ◽

Phase Composition ◽

Surface Morphology ◽

Tool Steel ◽

High Speed ◽

Steel Surface

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FAGERSTA FB-52

Alloy Digest ◽

10.31399/asm.ad.ts0324 ◽

1977 ◽

Vol 26 (9) ◽

Keyword(s):

Mechanical Properties ◽

Surface Treatment ◽

Tool Steel ◽

High Speed ◽

Cutting Tools ◽

Heat Treating ◽

Twist Drills

Abstract FAGERSTA FB-52 is a moderately alloyed high-speed tool steel (hardware grade) designed to provide a desirable combination of economy and good mechanical properties. It is especially well suited for twist drills and similar cutting tools. Among its many other uses are gear cutters, punches and wood-working tools. This datasheet provides information on composition and hardness. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-324. Producer or source: Fagersta Steels Inc..

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