A Reseach of Fracture Mechanism in Micro Cutting of 45 Steel Based on Material Properties

2013 ◽  
Vol 675 ◽  
pp. 370-373 ◽  
Author(s):  
Hong Jun Ding ◽  
Xi Bin Wang
Keyword(s):  
Material Properties ◽  
Fracture Process ◽  
Dislocation Theory ◽  
Film Sample ◽  
Fracture Characteristics ◽  
Micro Cutting ◽  
Transmission Electron ◽  
Initiation And Propagation ◽  
Cutting Model ◽  
Ductile Fracture Process

Abstract: Though the observation in micro cutting of 45 steel, the deformation zone of fracture characteristics was studied, and the corresponding cutting model was established; on dynamic tensile and situ observation of 45 steel by transmission electron microscopy , micro cutting ductile fracture process is simulated by the experiment on the steel tensile of 45 film sample, and the mechanism on initiation and propagation of crack in micro cutting fracture was studied with dislocation theory.

Reserch of Dislocation Theory in Micro Cutting

2012 ◽  
Vol 482-484 ◽  
pp. 2033-2036
Author(s):  
Hong Jun Ding ◽  
Xi Bin Wang ◽  
Zhi Qiang Liang ◽  
Qiang Jia
Keyword(s):  
Fracture Strength ◽  
Paper Analysis ◽  
Fracture Dislocation ◽  
Dislocation Theory ◽  
Line Defect ◽  
Dislocation Mechanism ◽  
Micro Cutting ◽  
Metal Fracture ◽  
Depth Analysis

This paper analysis Griffith 's Theory and the metal theoretical fracture strength, thus introducing a line defect that existence in actual crystal — dislocation; And in-depth analysis the metal fracture dislocation mechanism in the micro cutting, and the formation and expand of the Fracture cracks , provides the theory basis for micro cutting

Thermal stability of laser-induced modified volumes in Si as studied by in situ and ex situ heating experiments

Microscopy ◽  
2018 ◽  
Vol 67 (2) ◽  
pp. 112-120
Author(s):  
Hiroyasu Saka ◽  
Hiroyuki Iwata ◽  
Daisuke Kawaguchi
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Laser Beam ◽  
Ex Situ ◽  
Dislocation Theory ◽  
Tail Region ◽  
Transmission Electron ◽  
Thermal Stability Of

Abstract Radiation of a permeable laser beam into Si induces considerable modification of structures. Thermal stability of the laser-induced modified volumes (LIMV’s) was studied comprehensively by means of in situ and ex situ heating experiments using transmission electron microscopy. The behavior in the tail region of a LIMV can be understood by dislocation theory, while that of a void formed at the very focus of a laser beam cannot be understood easily.

Finite Element Modeling of Burr Formation in Metal Cutting with a Backup Material

2007 ◽  
Vol 24-25 ◽  
pp. 71-76 ◽  
Author(s):  
Wen Jun Deng ◽  
Wei Xia ◽  
Long Sheng Lu ◽  
Yong Tang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Material Properties ◽  
Metal Cutting ◽  
Element Model ◽  
Burr Formation ◽  
Tool Geometry ◽  
Cutting Condition ◽  
Burr Size ◽  
Initiation And Propagation

2D finite element model with the same material for backup to minimize the burr size was developed to investigate mechanism of burr formation and burr minimization. The flowstress of the workpiece and backup material are taken as a function of strain, strain-rate and temperature. Temperature-dependent material properties are also considered. The Cockroft-Latham damage criterion has been adopted to simulate ductile fracture. The crack initiation and propagation is simulated by deleting the mesh element. The result shows putting a backup material behind the edge of the workpiece is an effective way to minimize the burr size. The effects of cutting condition, temperature and different backup material properties on the burr formation and burr size can be investigated using the developed finite element model. This model could be useful in the search for optimal tool geometry and cutting condition for burr minimization and for the modeling of a burr formation mechanism.

scholarly journals Формирование интерметаллида Cu-=SUB=-6-=/SUB=-Sn-=SUB=-5-=/SUB=- в тонких пленках Cu/Sn

2021 ◽  
Vol 63 (12) ◽  
pp. 2205
Author(s):  
Л.Е. Быкова ◽  
С.М. Жарков ◽  
В.Г. Мягков ◽  
Ю.Ю. Балашов ◽  
Г.С. Патрин
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Room Temperature ◽  
Hexagonal Phase ◽  
Film Sample ◽  
Cu6sn5 Phase ◽  
Bilayer Films ◽  
Transmission Electron ◽  
Diffraction Mode ◽  
Diffraction Patterns

The study of the formation of the Cu6Sn5 intermetallic compound in Sn(55nm)/Cu(30nm) thin bilayer films was carried out directly in the column of a transmission electron microscope (electron diffraction mode) by heating the film sample from room temperature to 300 °C and recording the electron diffraction patterns. The thin films formed as a result of a solid state reaction were monophase and consisted of the η-Cu6Sn5 hexagonal phase. The temperature range for the formation of the η-Cu6Sn5 phase was determined. The estimate of the effective interdiffusion coefficient of the reaction suggests that the main mechanism for the formation of the Cu6Sn5 intermetallic is diffusion along the grain boundaries and dislocations.

scholarly journals Deformation and fracture behavior of new strain-transformable titanium alloys: a multi-scale investigation

2020 ◽  
Vol 321 ◽  
pp. 11006
Author(s):  
Chloé VARENNE ◽  
Frédéric PRIMA ◽  
Cédrik BROZEK ◽  
Julie BOURGON ◽  
Jacques BESSON ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Coarse Grained ◽  
Multi Scale ◽  
Ti Alloys ◽  
Deformation And Fracture ◽  
Initiation And Propagation ◽  
Deformation Features ◽  
Deformation Work ◽  
Ductile Fracture Process

Titanium alloys possessing Twinning and Transformation Induced Plasticity effects show promising mechanical properties, particularly high ductility, hardenability, impact and fracture toughness. This work focuses on a strain-transformable, coarse-grained β-Ti-Cr-Sn alloy displaying TWIP effect. To account for the enhanced properties of this alloy, compared to more conventional β-Ti alloys, fracture and deformation features were correlated at different scales. Examinations evidenced a major role of twinning and, more generally, of plasticity-induced phenomena in the ductile fracture process. The resistance of this alloy to plastic deformation (work-hardening), and to crack initiation and propagation is interpreted in view of the progressive, multiscale twinning mechanisms that occur up to the very final stages of fracture.

scholarly journals Nanostructure Quantification of Carbon Blacks

2018 ◽  
Vol 5 (1) ◽  
pp. 2 ◽  
Author(s):  
Madhu Singh ◽  
Randy Vander Wal
Keyword(s):  
Carbon Black ◽  
Material Properties ◽  
Nanometer Scale ◽  
Fringe Analysis ◽  
Combustion Condition ◽  
Carbon Blacks ◽  
Production Processes ◽  
Transmission Electron ◽  
Aggregate Morphology ◽  
End Use

Carbon blacks are an extensively used manufactured product. There exist different grades by which the carbon black is classified, based on its purpose and end use. Different properties inherent to the various carbon black types are a result of their production processes. Based on the combustion condition and fuel used, each process results in a carbon black separate from those obtained from other processes. These carbons differ in their aggregate morphology, particle size, and particle nanostructure. Nanostructure is key in determining the material’s behavior in bulk form. A variety of carbon blacks have been analyzed and quantified for their lattice parameters and structure at the nanometer scale, using transmission electron microscopy and custom-developed fringe analysis algorithms, to illustrate differences in nanostructure and their potential relation to observed material properties.

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