Investigation of micromechanical properties of fused alumina and silicone carbide grains

Abstract In this study, the relationships between friction and viscoelastic properties such as loss tangent tan δ and storage modulusE′ were examined. Wet skid resistance was measured using the British Pendulum Tester. The rubber specimens were rubbed againstfive silicone carbide cloths of differing abrasive grain sizes. The viscoelastic properties of the rubber specimens were measured with a viscoelasticspectrometer. From the data on wet skid resistance and viscoelastic properties, it is found that the coefficient of friction μ varies as follows: μ = a + b · tan δ/E′ where a and b are constants. Tan δ/E′ was related to the hysteresis term of friction, and the μ-frequency curves were compared with the tan δ/E′ –frequency curves.

Download Full-text

An optomechanogram: co-registered microstructural and micromechanical properties of the cervix

10.26226/morressier.5f5f8e69aa777f8ba5bd5f9c ◽

2020 ◽

Author(s):

Amir Ostadi Moghaddam

Keyword(s):

Micromechanical Properties

Download Full-text

Investigation of the Wear Behavior of PVD Coated Carbide Tools during Ti6Al4V Machining with Intensive Built Up Edge Formation

Coatings ◽

10.3390/coatings11030266 ◽

2021 ◽

Vol 11 (3) ◽

pp. 266

Author(s):

M.S.I. Chowdhury ◽

B. Bose ◽

S. Rawal ◽

G.S. Fox-Rabinovich ◽

S.C. Veldhuis

Keyword(s):

Tool Wear ◽

Titanium Alloys ◽

Wear Behavior ◽

Cutting Temperature ◽

Ti6al4v Alloy ◽

Adhesive Interaction ◽

Heavy Load ◽

Micromechanical Properties ◽

Rough Turning ◽

Coated Carbide

Tool wear phenomena during the machining of titanium alloys are very complex. Severe adhesive interaction at the tool chip interface, especially at low cutting speeds, leads to intensive Built Up Edge (BUE) formation. Additionally, a high cutting temperature causes rapid wear in the carbide inserts due to the low thermal conductivity of titanium alloys. The current research studies the effect of AlTiN and CrN PVD coatings deposited on cutting tools during the rough turning of a Ti6Al4V alloy with severe BUE formation. Tool wear characteristics were evaluated in detail using a Scanning Electron Microscope (SEM) and volumetric wear measurements. Chip morphology analysis was conducted to assess the in situ tribological performance of the coatings. A high temperature–heavy load tribometer that mimics machining conditions was used to analyze the frictional behavior of the coatings. The micromechanical properties of the coatings were also investigated to gain a better understanding of the coating performance. It was demonstrated that the CrN coating possess unique micromechanical properties and tribological adaptive characteristics that minimize BUE formation and significantly improve tool performance during the machining of the Ti6Al4V alloy.

Download Full-text