scholarly journals Influence of slide burnishing with diamond composite on surface topography of hardened tool steels for cold working

Mechanik ◽  
2018 ◽  
pp. 1110-1115
Author(s):  
Daniel Toboła ◽  
Aneta Łętocha
Keyword(s):  
Surface Topography ◽  
Cold Working ◽  
Tool Steels ◽  
Diamond Composite ◽  
Slide Burnishing

Thick Si-doped DLC coatings with high load bearing capacity on cold working tool steels by PECVD

2021 ◽  
pp. 1-19
Author(s):  
Xinyu Wang ◽  
Xudong Sui ◽  
Shuaituo Zhang ◽  
Mingming Yan ◽  
Yan Lu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Cold Working ◽  
Chemical Vapor ◽  
Tool Steels ◽  
Dlc Coatings ◽  
Wear Rates ◽  
Si Doped ◽  
Silicon Doped ◽  
Hydrogenated Amorphous ◽  
Degree Of Graphitization

Abstract For improving the wear resistance, thick silicon doped hydrogenated amorphous carbon (a-SiC:H) coatings were deposited on cold working tool steels by Plasma Enhanced Chemical Vapor Deposition (PECVD) technology. The increase of the acetylene (C2H2) flow rate distinctly tuned the microstructure of a-SiC:H coatings, including an increase in the coating thickness (>15 μm), a decrease in the silicon content, a greater sp2/sp3 ratio and higher degree of graphitization. The highest hardness of 19.61 GPa and the greatest critical load of 50.7 N were obtained. The coating showed low wear rates against different friction pairs and presented excellent abrasive wear resistance at high applied load and the wear rates decreased with increasing loads, which exhibited an outstanding application prospect in cold working tool steels.

Mechanical finishing and ion beams application to cold working tool steels: consequences for scratch resistance

2018 ◽  
Vol 8 (01) ◽  
pp. 178-182
Author(s):  
Witold Brostow ◽  
Sven Lohse ◽  
Allison T. Osmanson ◽  
Daniel Tobola ◽  
Duncan L. Weathers
Keyword(s):  
Cold Working ◽  
Scratch Resistance ◽  
Ion Beams ◽  
Tool Steels ◽  
Image Position

Abstract

scholarly journals Impact of Mechanical Processes as a Pre-Sulphonitriding Treatment on Tribology Properties of Selected P/M Tool Steels

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3431 ◽  
Author(s):  
Daniel Toboła
Keyword(s):  
Wear Resistance ◽  
Cross Sections ◽  
Tool Steels ◽  
X Ray Diffraction ◽  
Wear Rates ◽  
Different Types ◽  
Pin On Disc ◽  
Slide Burnishing ◽  
Gas Quenching ◽  
Vacuum Furnaces

We have evaluated phase composition changes in the surface layer (SL) and wear resistance of steels investigated after various mechanical processes such as a pre-sulphonitriding treatments. Two various paths of surface modification were employed: Grinding–sulphonitriding (G-SN) and hard turning–slide burnishing–sulphonitriding (T-B-SN). Studies were carried out on Vanadis 8 and Vancron 40 tool steels, which are classified as advanced powder metallurgy (P/M) high-alloyed steels with different types and amounts of carbides. Heat treatment to the final hardness of 64 ± 1 HRC (Vanadis 8) and 62 ± 1 HRC (Vancron 40) was performed in vacuum furnaces with gas quenching. Precipitation of different types such as sulfides, nitrides, and carbides was observed using X-ray diffraction analysis. Tribological properties of SL were evaluated by pin-on-disc experiments. Pins of Al2O3 and 19MnB4 steel were used as counterbodies materials. 3D surface geometrical structure measurements were also performed. Wear tracks and cross-sections of SL were observed using optical and scanning electron microscopy. The three-stage process increases the wear resistance about 37% and 30%, respectively for Vanadis 8 and Vancron 40 (in case of alumina pins), whereas values of wear rates after tests performed against steel pins were very similar for two compared processes for both steels.

Improvement of wear resistance of some cold working tool steels

Wear ◽  
2017 ◽  
Vol 382-383 ◽  
pp. 29-39 ◽  
Author(s):  
Daniel Toboła ◽  
Witold Brostow ◽  
Kazimierz Czechowski ◽  
Piotr Rusek
Keyword(s):  
Wear Resistance ◽  
Cold Working ◽  
Tool Steels

scholarly journals Manufacturing of Tool Steels by PBF-EB

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1640
Author(s):  
Alexander Kirchner ◽  
Burghardt Klöden ◽  
Marie Franke-Jurisch ◽  
Luis Inarra Rauh-Hain ◽  
Thomas Weißgärber
Keyword(s):  
Crack Formation ◽  
Cold Working ◽  
High Strength ◽  
Tool Steels ◽  
High Corrosion Resistance ◽  
Powder Bed ◽  
Material Development ◽  
Processing Strategies ◽  
Time Savings ◽  
Am Processes

Additive manufacturing (AM) of metals is stimulating the tool making industry. Moreover, besides the production of lost forms, AM processes are now being used to directly generate tools, molds or parts, leading to massive time savings. In the case of material development for AM, the challenge is to operate with carbon-containing iron-based materials distinguished by high strength and hardness, as well as high corrosion resistance and thermal conductivity. Often, those materials are susceptible to crack formation during processing. Using Electron Beam Powder Bed Fusion (PBF-EB), the challenge of crack formation can be overcome by using high process temperatures in the range 800–900 °C. In this paper, results on the processing of a cold-working tool steel (X65MoCrWV3-2) and a hot-working steel (X37CrMoV5-1) will be presented. These include the processing window, processing strategies to minimize the density of cracks and properties with respect to microstructure and hardness.

scholarly journals Surface Integrity Achieved by Finishing Processes on Sverker 21 and Vanadis 6 Cold Working Tool Steels

2015 ◽  
Author(s):  
W. Brostow ◽  
K. Czechowski ◽  
M. Kot ◽  
P. Rusek ◽  
D. Toboła
Keyword(s):  
Surface Integrity ◽  
Cold Working ◽  
Impact Testing ◽  
Favorable Effect ◽  
Tool Steels ◽  
Industrial Performance ◽  
Steel Surfaces ◽  
Finishing Processes ◽  
Performance Results ◽  
Ball On Disc

Control of surface integrity is an important factor for components like cold working tools exposed to wear and fatigue damage. We have performed a number of operations on Sverker 21 and Vanadis 6 steel surfaces: turned + burnished, turned + nitrided and turned + burnished + nitrided. The effects were followed by surface roughness and microstructure analysis, ball-on-disc tribology and impact testing. The sequence of turned + burnished + nitrided treatments has the most favorable effect on the surface integrity of the finished tools and their industrial performance. Results will be presented at the Conference.

scholarly journals Comparison of surface layer properties of AISI D2 and Vanadis 6 hardened tool steel

Mechanik ◽  
2017 ◽  
Vol 90 (10) ◽  
pp. 852-854
Author(s):  
Daniel Toboła ◽  
Jolanta Cyboroń ◽  
Aneta Łętocha ◽  
Jolanta Laszkiewicz-Łukasik
Keyword(s):  
Surface Layer ◽  
Tool Steel ◽  
Hard Turning ◽  
Geometrical Structure ◽  
Tool Steels ◽  
Aisi D2 ◽  
Hardened Tool Steel ◽  
Slide Burnishing

Selected properties of the surface layer (SL) of AISI D2 and Vanadis 6 tool steels at hardness of 60 ±1 HRC, after grinding and hard turning with subsequent slide burnishing are presented. The influence of the mentioned mechanical treatments in relation to the geometrical structure, microstructure and stresses level in SL for tested steels were determined.

scholarly journals New diamond composite tools and their impact on AISI 4140 alloy steel surface after slide burnishing

Mechanik ◽  
2019 ◽  
Vol 92 (10) ◽  
pp. 610-615
Author(s):  
Magdalena Szutkowska ◽  
Daniel Toboła ◽  
Lucyna Jaworska ◽  
Marcin Rozmus
Keyword(s):  
Alloy Steel ◽  
Steel Surface ◽  
X Ray Diffraction ◽  
Diamond Composite ◽  
X Ray ◽  
Young’S Moduli ◽  
Transmission Electron ◽  
Steel Bar ◽  
Aisi 4140 ◽  
Slide Burnishing

Working parts of slide burnishing tools were made from two new diamond composites with ceramic bonding: MAX Ti3GeC2 and TiB2nano phases, respectively. Microstructure and micro composition were analyzed by scanning and transmission electron microscopy and X-ray diffraction. Vickers hardness HV1 values were 36 and 46 GPa, Young’s moduli 490 and 560 GPa, tensile strengths 400 and 560 MPa, fracture toughness 8.4 and 11.0 MPa·m1/2 and friction coefficient values 0.63 and 0.56, respectively for the composites with MAX Ti3GeC2 and TiB2nano phases. The tools were tested by slide burnishing on previously turned AISI 4140 alloy steel bar. Improvement in the surface geometric structure was demonstrated for both materials, more so in the case of TiB2nano phase, as compared to burnishing bycomposites with MAX Ti3GeC2 phase.

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