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Abstract

In hot forging process, tool life is an important factor which influences the economy of production. Wear mechanisms in these processes are dependent on each other, so modeling of them is a difficult problem. The present research is focused on development of a hybrid tool wear model for hot forging processes and evaluation of adding adhesive mechanism component to this model. Although adhesive wear is dominant in cases, in which sliding distances are large, there is a group of hot forging processes, in which adhesion is an important factor in specific tool parts. In the paper, a proposed hybrid tool wear model has been described and various adhesive wear models have been reviewed. The feasible model has been chosen, adapted and implemented. It has been shown that adding adhesive wear model increases predictive capabilities of the global hybrid tool wear model as far as characteristic hot forging processes is considered.

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Authors and Affiliations

M. Wilkus
Ł. Rauch
D. Szeliga
M. Pietrzyk
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Abstract

The paper studied the tribological behaviour of electro discharge deposited ZE41A magnesium alloy using wear map. The wear experiments are conducted using pin on disc technique for different parameters such as applied load (1.5 kg-3.5 kg), sliding speed (100 rpm-200 rpm) and sliding time (3 min-7 min). Wear mechanism map is constructed by taking the applied load on y-axis and sliding speed on x-axis. The wear mechanism map is utilized to study the dominance of particular wear mechanism that dominates particular wear regimes such as mild wear, severe wear and ultra severe wear. It is observed that the wear rate increased with increased the applied load and sliding speed. Various mechanisms such as abrasion, oxidation, delamination and melting are identified through scanning electron microscope (SEM).
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Authors and Affiliations

U. Elaiyarasan
1
ORCID: ORCID
V. Satheeshkumar
2
ORCID: ORCID
C. Senthilkumar
3
ORCID: ORCID

  1. Department of Automobile Engineering, Easwari Engineering College, Chennai, India-600089
  2. Department of Mechanical Engineering, Government College of Engineering, Salem, India-636011
  3. Department of Mechanical Engineering, University College of Engineering, Panruti-607106, India
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Abstract

Polyester coatings are among the most commonly used types of powder paints and present a wide range of applications. Apart from its decorative values, polyester coating successfully prevents the substrate from environmental deterioration. This work investigates the cavitation erosion (CE) resistance of three commercial polyester coatings electrostatic spray onto AW-6060 aluminium alloy substrate. Effect of coatings repainting (single- and double-layer deposits) and effect of surface finish (matt, silk gloss and structural) on resistance to cavitation were comparatively studied. The following research methods were used: CE testing using ASTM G32 procedure, 3D profilometry evaluation, light optical microscopy, scanning electron microscopy (SEM), optical profilometry and FTIR spectroscopy. Electrostatic spray coatings present higher CE resistance than aluminium alloy. The matt finish double-layer (M2) and single-layer silk gloss finish (S1) are the most resistant to CE. The structural paint showed the lowest resistance to cavitation wear which derives from the rougher surface finish. The CE mechanism of polyester coatings relies on the material brittle-ductile behaviour, cracks formation, lateral net-cracking growth and removal of chunk coating material and craters’ growth. Repainting does not harm the properties of the coatings. Therefore, it can be utilised to regenerate or smother the polyester coating finish along with improvement of their CE resistance.
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Authors and Affiliations

Mirosław Szala
1
ORCID: ORCID
Aleksander Świetlicki
2
Weronika Sofińska-Chmiel
3

  1. Department of Materials Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
  2. Students Research Group of Materials Technology, Department of Materials Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
  3. Analytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, pl. Maria Curie-Sklodowska 3, 20-031 Lublin, Poland
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Abstract

AlCrFeCuCoNi high entropy particles were alloyed on Ti-6Al-4V surface using Plasma transferred arc (PTA) process. PTA alloyed surfaces were investigated for their phase formation, microhardness improvement and wear behaviour. The various wear mechanism and their corresponding surface roughness were studied. The results revealed that the dual phase of BCC and FCC microstructure along with some intermetallic compounds were grown in the alloyed region through the PTA technique and good metallurgical bonding of the alloyed region with the base material were achieved. The PTA alloyed region exhibited a hardness of 718 HV0.2 which is 2.2 times higher than the hardness of base material. The PTA alloyed samples showed higher wear resistance due to the solid solution strengthening as the HEA has high entropy of mixing that leads to the reduction of free energy of the alloyed region. It exhibited better interconnection of the coated material and superior metallurgical bonding to the base material. Frictional heat produced during the wear test has promoted the formation of FeO, Cr2O3, CuO, NiO and Al2O3 oxide film on the PTA alloyed sample. These oxide films act as a barrier between two mating surfaces and improve the tribo performance of the PTA alloyed sample.
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Authors and Affiliations

G. Prabu
1
Muthukannan Duraiselvam
1

  1. National Institute of Technology, Department of Production Engineering, Tiruchirappalli, India
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Abstract

The versatile application of titanium alloy in the aerospace industry and it’s hard to machine characteristics focus towards the additive manufacturing. The Ti-6Al-4V alloy is manufactured using the electron beam source with a novel method of prepositioned titanium alloy wires. The tribology of the additive manufactured titanium alloy under dry sliding condition is experimented and analysed using Taguchi technique. The targeted objective of minimum tribological responses are attained with the identified optimal parameters as load – 9.81 N, sliding velocity – 3 m/s, sliding distance – 3000 m for minimum specific wear rate and load – 9.81 N, sliding velocity – 3 m/s, sliding distance – 1000 m for minimum coefficient of friction. Among the parameters tested, load is found to be the dominant factor on the tribology of additively manufactured titanium alloy. The morphological analysis on the worn surface and debris revealed the existence of abrasion, delamination and adhesion wear mechanisms. The increase in the load dominantly showed the appearance of delamination mechanism.
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Authors and Affiliations

A. Manjunath
1
ORCID: ORCID
V. Anandakrishnan
2
ORCID: ORCID
S. Ramachandra
1
ORCID: ORCID
K. Parthiban
1
ORCID: ORCID
S. Sathish
3
ORCID: ORCID

  1. Gas Turbine Research Establishment, Defence Research & Development Organization, Bangalore, Karnataka-560093, India
  2. Department of Production Engineering, National Institute of Technology Tiruchirapalli, Tiruchirappalli – 620015, Tamil Nadu, India
  3. Department of Mechatronics Engineering, K.S. Rangasamy College of Technology, Tiruchengode, Namakkal – 637215, Tamil Nadu, India

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