The effect of the interlayer CrN on adhesion characteristics of ta-C films on high-speed steel substrate

ABSTRACTIn this paper, a multilayer CNx/TiN composite film on high-speed steel substrate was prepared by using a multi-arc assisted DC reactive magnetron sputtering system. The cross-section observations of the fracture surface reveal that the films show a pure cleavage fracture due to its super-high hardness, and the interfacial strength between the film and substrate is associates with the film thickness, i.e., 2μm is a critical thickness for the present deposition. That is to say, there is no disbonding or cracking at the interface when the film thickness is less than 2μm, while the interfacial failure is generated if the film thickness is larger than 2μm. This direct SEM observation of the fracture surface provides a distinct image for evaluating the mechanical property and also analyzing the failure mechanism of the films.

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Evolution of TiN Coating Surface Roughness during Physical Vapor Deposition on High Speed Steel Substrate

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.604.67 ◽

2014 ◽

Vol 604 ◽

pp. 67-70

Author(s):

Leonid Kupchenko ◽

Rauno Tali ◽

Eron Adoberg ◽

Valdek Mikli ◽

Vitali Podgursky

Keyword(s):

Surface Roughness ◽

Vapor Deposition ◽

Physical Vapor Deposition ◽

High Speed ◽

Steel Substrate ◽

High Speed Steel ◽

Growth Exponent ◽

Force Microscopy ◽

Tin Coatings ◽

Atomic Force

TiN coatings with different thickness were prepared by arc ion plating (AIP) physical vapor deposition (PVD) on high speed steel (HSS) substrates. TiN coatings surface roughness was investigated by atomic force microscopy (AFM) and 3D optical profilometry and growth kinetics was described using scaling exponents β and α. The growth exponent β is 0.91-1.0 and the roughness exponent α is 0.77-0.81. Due to relatively high value of the exponent α, the surface diffusion is likely predominant smoothening mechanism of TiN growth.

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Study of Residue Stress and Phase Structure of c-BN Films with BNx Implanted Buffer Interlayer on High Speed Steel Substrate

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.155-156.795 ◽

2012 ◽

Vol 155-156 ◽

pp. 795-799

Author(s):

Jia Wu He ◽

Zhi Hai Cai ◽

Yue Lan Di ◽

Zhen Yang

Keyword(s):

Grain Size ◽

Buffer Layer ◽

Phase Structure ◽

High Speed ◽

Steel Substrate ◽

High Speed Steel ◽

Growth Conditions ◽

Xps Analysis ◽

Interfacial Mixing

In this paper, the influence of the BNx implanted buffer layer on growth and residue stress of c-BN films were mainly investigated. The experiment results showed that the introduce of BNx implanted buffer interlayer can increase the c-BN content in the films and reduce the residue stress obviously. When the nitrogen dose was 9.6×1017 N+/cm2, the residue stress of c-BN films reached the least value of 3.0GPa. AFM showed that the surface of the c-BN film on the BNx implanted buffer layer is low in roughness and small in grain size. XPS analysis results show an interfacial mixing in the buffer layer have an even N/B distribution. And the surface of buffer interlayer was mainly in BN phase, which is the main reason to improve the growth conditions and reduce the residue stress of c-BN films.

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Improving Ag-DLC Film Adherence on High-Speed Steel by Varying Ag Contents in A Mid-Frequency Dual-Magnetron Sputtering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.434-435.462 ◽

2010 ◽

Vol 434-435 ◽

pp. 462-465

Author(s):

Xiang Yu ◽

Cheng Biao Wang ◽

Zhi Jian Peng

Keyword(s):

Magnetron Sputtering ◽

High Speed ◽

Normal Load ◽

Steel Substrate ◽

High Speed Steel ◽

Microscopic Analysis ◽

Relative Displacement ◽

Dlc Film ◽

Film Adhesion ◽

Displacement Speed

Aiming at improving their tribological behaviors, adhesion of diamond-like carbon (DLC) films on high-speed steel was investigated by varying doping silver (Ag) contents in a mid-frequency dual-magnetron sputtering system. Scratch testing was performed on the Ag-DLC films under a progressive normal load from 3 to 80 N, along with a Rockwell C indenter at a relative displacement speed for a Rockwell testing. A microscopic analysis of the scratch evolution under a progressive normal load permits identification of the various traces and the damage mechanisms of the films. A process of the film adhesion failure typically in turn appears like this, germination of the cracks along the longitudinal edges of the scratch traces; propagation in front of the indenter; and, detachment in the subsurface by shearing. An Ag-DLC film of 15.2 at% Ag exhibits a superior adherence on the steel substrate as compared with the three Ag DLC films of the other doping silver contents.

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Characterisation of C-B-N Diffusion Layers Developed on High-Speed Steel Substrate

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.326-328.285 ◽

2012 ◽

Vol 326-328 ◽

pp. 285-290

Author(s):

Alexander S. Chaus ◽

Lubomír Čaplovič ◽

Y. A. Chaus ◽

J. Sojka

Keyword(s):

High Speed ◽

Steel Substrate ◽

High Speed Steel ◽

X Ray ◽

Depth Profiles ◽

Diffusion Layers ◽

Diffusion Controlled ◽

M2 High Speed Steel ◽

Steel Substrates ◽

Boron Nitrogen

C-B-N diffusion layers on the samples of wrought and as-cast high-speed steels of AISI M2 grade have been developed thermo-chemically. Thermo-chemical treatment was carried out after full heat treatment and included holding for 1 and 3 h at 550°C in order to produce different C-B-N diffusion layers. The microstructure and component depth profiles in the C-B-N diffusion layers were studied by scanning electron microscopy and energy dispersive X-ray spectrometry. It was shown that well adhered (diffusion controlled) carbon-boron-nitrogen layers with nanosized microstructure can be thermo-chemically developed at 550°C for 1 h on the wrought and as-cast M2 high-speed steel substrates. In the samples made of the wrought M2 high-speed steel and held at 550°C for 3 h the C-B-N diffusion layer develops in the fiber-like morphology.

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