scholarly journals Retraction: Synthesis of cubic boron nitride diffused-D2 steel surface composite by thermo-chemical diffusion process to enhance the wear resistance (Mater. Res. Express 7 096503)

2021 ◽  
Vol 8 (10) ◽  
pp. 109701
Keyword(s):  
Wear Resistance ◽  
Boron Nitride ◽  
Diffusion Process ◽  
Steel Surface ◽  
Cubic Boron Nitride ◽  
Chemical Diffusion ◽  
Surface Composite ◽  
D2 Steel

DEVELOPMENT OF SURFACE ROUGHNESS PREDICTION MODEL FOR HARD TURNING ON AISI D2 STEEL USING CUBIC BORON NITRIDE INSERT

2017 ◽  
Vol 80 (1) ◽  
Author(s):  
Amrifan Saladin Mohruni ◽  
Muhammad Yanis ◽  
Edwin Kurniawan
Keyword(s):  
Surface Roughness ◽  
Boron Nitride ◽  
Feed Rate ◽  
Hard Turning ◽  
Cubic Boron Nitride ◽  
Cutting Speed ◽  
Machining Parameters ◽  
Aisi D2 Steel ◽  
Aisi D2 ◽  
D2 Steel

Hard turning is an alternative to traditional grinding in the manufacturing industry for hardened ferrous alloy material above 45 HRC. Hard turning has advantages such as lower equipment cost, shorter setup time, fewer process steps, greater part geometry flexibility and elimination of cutting fluid. In this study, the effect of cutting speed and feed rate on surface roughness in hard turning was experimentally investigated. AISI D2 steel workpiece (62 HRC) was machined with Cubic Boron Nitride (CBN) insert under dry machining. A 2k-factorial design with 4 centre points as an initial design of experiment (DOE) and a central composite design (CCD) as augmented design were used in developing the empirical mathematical models. They were employed for analysing the significant machining parameters. The results show that the surface roughness value decreased (smoother) with increasing cutting speed. In contrary, surface roughness value increased significantly when the feed rate increased. Optimum cutting speed and feed rate condition in this experiment was 105 m/min and 0.10 mm/rev respectively with surface roughness value was 0.267 µm. Further investigation revealed that the second order model is a valid surface roughness model, while the linear model cannot be used as a predicted model due to its lack of fit significance.

Hard Turning of AISI D2 Steel by Polycrystalline Cubic Boron Nitride (PCBN)

2015 ◽  
Vol 766-767 ◽  
pp. 649-654
Author(s):  
A. Srithar ◽  
K. Palanikumar ◽  
B. Durgaprasad
Keyword(s):  
Boron Nitride ◽  
Hard Turning ◽  
Cubic Boron Nitride ◽  
Machining Process ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Aisi D2 Steel ◽  
Polycrystalline Cubic Boron Nitride ◽  
Aisi D2 ◽  
D2 Steel

The machining of hard turning is performed on hardened steel in the range of 45 to 68 Rockwell hardness using a variety of tool materials such as Polycrystalline cubic boron nitride (PCBN) , Polycrystalline diamond (PCD) and Cubic boron nitride (CBN). It is an alternative to conventional grinding process is a flexible and effective machining process for hardened metals and hence broadly used in various applications such as dies, moulds, tools, gears, cams, shafts, axles, bearings and forgings. Although the process is performed within small depth of cut and feed rates, estimates to reduce machining time as high as 60 % in hard turning. This paper discusses the importance of hard turning of AISI D2 steel. In this study, Experimental investigations are carried out on conventional lathe using prefixed the cutting conditions. The responses studied in the investigation are cutting forces (Fa, Ft and Fz). The cutting parameters considered for the investigation are cutting speed, feed and depth of cut. The influence of machining parameters on response is studied and presented in detail.

Study on Friction Property of the Ni/ZrO2 Composite Infiltrated Layer on Cast Steel Surface under Dry Fraction

2014 ◽  
Vol 1055 ◽  
pp. 73-77
Author(s):  
Xian Ming Sun ◽  
Gui Rong Yang ◽  
Lei Wei ◽  
Yu Lan Liu
Keyword(s):  
Wear Resistance ◽  
Steel Surface ◽  
Cast Steel ◽  
Composite Layer ◽  
Maximum Hardness ◽  
Friction Property ◽  
Casting Method ◽  
Surface Composite ◽  
Surface Composite Layer ◽  
Gradient Change

The surface composite layer Ni/ZrO2 on the ZG45 cast steel surface was fabricated through vacuum infiltration casting method. This paper researched on the Ni/ZrO2 composite infiltrated layer morphology, hardness and the friction property under fry friction. The results show that the main phase structure of the layer is ZrO2, Cr2B, NiB and FeNi. The macrohardness of the layer is HRC60~64. The micohardness presents gradient change. The maximum hardness appears at subsuface. The 10% ZrO2 composite infiltrated layer wear resistance increases 10 times and 15% ZrO2 composite infiltrated layer increases 22.6 times than ZG45 under the 100N load. The 10% ZrO2 composite infiltrated layer wear resistance increases 8.5 times and 15% ZrO2 composite infiltrated layer increases 21.9 times under 250N load. The wear resistance has greatly improved.

Selective Laser Melting of Ti/cBN Composite

2019 ◽  
Vol 799 ◽  
pp. 257-262
Author(s):  
Tatevik Minasyan ◽  
Le Liu ◽  
Sofiya Aydinyan ◽  
Maksim Antonov ◽  
Irina Hussainova
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Boron Nitride ◽  
Selective Laser Melting ◽  
Cubic Boron Nitride ◽  
High Strength ◽  
Laser Melting ◽  
Consolidation Process ◽  
Laser Absorption ◽  
Application Fields

Titanium has been evaluated in a broad range of aerospace, biomedical and sports equipment applications due to its unique combination of high mechanical strength, light weight and good biocompatibility. However, Ti implants are often subject to wear in specific areas. Therefore, the improvement of mechanical properties, such as hardness, wear resistance, bearing capability of implants is a key point to broaden the application fields of titanium. Cubic boron nitride (cBN) is a well-known superhard material possessing high chemical stability and biocompatibility. However, cBN suffers from poor machinability and sinterability. Attempts to process boron nitride by laser treatment into intricate shapes are extremely difficult, expensive and time-consuming tasks squeezing its applicability. In this work, manufacturing of Ti/cBN cellular structures and solid parts of high strength and good wear resistance by selective laser melting was performed. In Ti/cBN composite powder, the boron nitride provides the excellent mechanical properties, and titanium promotes the laser absorption improving the process of densification. The parametric study of consolidation process has been performed and the microstructural features along with mechanical properties are examined.

scholarly journals Comparison of the Microstructure Evolution and Wear Resistance of Ti6Al4V Composite Coatings Reinforced by Hard Pure or Ni-plated Cubic Boron Nitride Particles Prepared with Laser Cladding on a Ti6Al4V Substrate

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 702 ◽  
Author(s):  
Shuren Fu ◽  
Lijing Yang ◽  
Pei Wang ◽  
Shaopeng Wang ◽  
Zhengxian Li
Keyword(s):  
Wear Resistance ◽  
Boron Nitride ◽  
Composite Coating ◽  
Laser Cladding ◽  
Reaction Layer ◽  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Cubic Boron Nitride ◽  
Wear Test ◽  
X Ray

Titanium alloy is a major structural material with excellent high specific strength in aerospace applications. Cubic boron nitride (cBN) is a synthetic wear-resistant material with high hardness, similar to that of diamond, that is used in mechanical cutting and grinding. In addition, the thermal stability of cubic boron nitride particles is much better than that of diamond. In order to further enhance the wear resistance of the Ti6Al4V alloy, the laser cladding (LC) technology characteristics of metallurgical bonding were used to prepare cubic boron nitride/Ti6Al4V and Ni-plated cubic boron nitride/Ti6Al4V composite coatings on Ti6Al4V substrates in this paper. However, in the laser molten pool, it is difficult to retain the raw properties of cubic boron nitride particles under laser radiation. Both composite coatings were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The microstructures and interface bonding between cubic boron nitride particles and the Ti6Al4V matrix were examined using SEM, and the wear resistance and the worn track morphology of the composite coatings were evaluated using the ball-on-disc wear test and step profiler (WTM-2E). The results indicated that the Ni-plated cubic boron nitride/Ti6Al4V composite coating showed fewer thermal defects in comparison with the cubic boron nitride/Ti6Al4V coating. The Ni plating on the surface of cubic boron nitride particles was able to avoid the generation of thermal cracking of the cubic boron nitride particles in the composite coating. The TiN reaction layer was formed between the cubic boron nitride particles and Ti6Al4V matrix, which effectively prevented the further decomposition of the cubic boron nitride particles. The XRD and XPS results confirmed that the TiN reaction layer formed between the cubic boron nitride particles and Ti6Al4V. The Ni plating on the surface of the cubic boron nitride particles was also beneficial for increasing the wear resistance of the composite coating.

Structural relationships in the synthesis of cubic boron nitride thin films by ion-assisted deposition

1994 ◽  
Vol 52 ◽  
pp. 638-639
Author(s):  
D. L. Medlin ◽  
T. A. Friedmann ◽  
P. B. Mirkarimi ◽  
M. J. Mills ◽  
K. F. McCarty
Keyword(s):  
Boron Nitride ◽  
Ion Irradiation ◽  
Cubic Boron Nitride ◽  
Film Stress ◽  
Bonded Phases ◽  
Structural Relationships ◽  
Precursor Material ◽  
Pressure Synthesis ◽  
Microstructure Of The Material

The allotropes of boron nitride include two sp2-bonded phases with hexagonal and rhombohedral structures (hBN and rBN) and two sp3-bonded phases with cubic (zincblende) and hexagonal (wurtzitic) structures (cBN and wBN) (Fig. 1). Although cBN is synthesized in bulk form by conversion of hBN at high temperatures and pressures, low-pressure synthesis of cBN as a thin film is more difficult and succeeds only when the growing film is simultaneously irradiated with a high flux of ions. Only sp2-bonded material, which generally has a disordered, turbostratic microstructure (tBN), will form in the absence of ion-irradiation. The mechanistic role of the irradiation is not well understood, but recent work suggests that ion-induced compressive film stress may induce the transformation to cBN.Typically, BN films are deposited at temperatures less than 1000°C, a regime for which the structure of the sp2-bonded precursor material dictates the phase and microstructure of the material that forms from conventional (bulk) high pressure treatment.

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