An assessment of residual stresses and micro-structure during single point incremental forming of commercially pure titanium used in biomedical applications

In the present study, a basic comparison between the cold formability of a commercially-pure Titanium (CP Ti) sheet in the single-point incremental forming (SPIF) and stamping processes is presented. An attempt was made to evaluate the SPIF formability by employing two tests. In the first test, parts having continuously varying wall angles were formed. While in the second test, parts having fixed wall angles were formed. The stamping formability was determined by conducting the limiting dome height (LDH) test. It is concluded that the forming limit curve (FLC) in SPIF is located much higher than the stamping FLC, even higher than the fracture limit curve in stamping. Moreover, the SPIF formability shows dependence on the test employed.

Download Full-text

Surface modification of commercially pure titanium by gold ion irradiation for biomedical applications

Surface Review and Letters ◽

10.1142/s0218625x21500694 ◽

2021 ◽

Author(s):

Ameeq Farooq ◽

Kashif Mairaj Deen ◽

Muhammad Rizwan ◽

Akhlaq Ahmad

Keyword(s):

Surface Modification ◽

Biomedical Applications ◽

Ion Irradiation ◽

Pure Titanium ◽

Commercially Pure Titanium ◽

Commercially Pure ◽

Gold Ion

Download Full-text

Pack Cementation Treatment of Titanium Using Tetracalcium Phosphate Powder for Biomedical Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.2172 ◽

2010 ◽

Vol 654-656 ◽

pp. 2172-2175

Author(s):

Kyosuke Ueda ◽

Hajime Suto ◽

Kaori Nakaie ◽

Takayuki Narushima

Keyword(s):

Reaction Layer ◽

Biomedical Applications ◽

Pure Titanium ◽

Pack Cementation ◽

Apatite Formation ◽

Commercially Pure Titanium ◽

Tetracalcium Phosphate ◽

Phosphate Powder ◽

Commercially Pure ◽

Cp Ti

The surface modification of commercially pure titanium (CP Ti) by pack cementation treatment at 973 K using tetracalcium phosphate (Ca4(PO4)2O, TTCP) slurry was investigated. An HAp phase and a CaTiO3 phase were observed on the reaction layer of the CP Ti substrate after pack cementation treatment at 973 K for 86.4 ks. TTCP powder decomposed to HAp and CaO, and CaO reacted with TiO2 to form CaTiO3. The reaction layer on the CP Ti substrate consisted of inner and outer layers and the particles were in the outer reaction layer. The pores observed on the reaction layer were formed by the detachment of particles from the outer layer. The bonding strength of the reaction layer was 68.1 MPa. Apatite completely covered the surface of the pack-cementation-treated CP Ti after immersion in Kokubo solution for 21.6 ks; such rapid apatite formation suggests that pack cementation treatment improves the biocompatibility of titanium.

Download Full-text

Investigations on multi-sheets single point incremental forming of commercial pure titanium alloys

Materials and Manufacturing Processes ◽

10.1080/10426914.2020.1753882 ◽

2020 ◽

Vol 35 (9) ◽

pp. 1002-1009

Author(s):

G. Yoganjaneyulu ◽

Raju C ◽

Natarajan Manikandan ◽

C. Sathiya Narayanan

Keyword(s):

Titanium Alloys ◽

Incremental Forming ◽

Single Point ◽

Pure Titanium ◽

Single Point Incremental Forming ◽

Commercial Pure Titanium

Download Full-text

Study the Effect of Multilayer Single Point Incremental Forming on Residual Stresses for Bottom Plates

Al-Khwarizmi Engineering Journal ◽

10.22153/kej.2017.02.004 ◽

2017 ◽

Vol 13 (3) ◽

pp. 99-107

Author(s):

Aseel Hamad Abed ◽

Aqeel Sabree Bedan ◽

Mohanad Faeq Noori

Keyword(s):

Residual Stresses ◽

Incremental Forming ◽

Single Point ◽

Important Task ◽

Bottom Plate ◽

Single Point Incremental Forming ◽

Production Operation ◽

Single Plate ◽

And Control

Abstract Knowing the amount of residual stresses and find technological solutions to minimize and control them during the production operation are an important task because great levels of deformation which occurs in single point incremental forming (SPIF), this induce highly non-uniform residual stresses. In this papera propose of a method for multilayer single point incremental forming with change in thickness of the top plate (0.5, 0.7, 0.9) mm and lubrication or material between two plates(polymer, grease, grease with graphite, mos2) to knowing an effect of this method and parameters on residual stresses for the bottom plates. Also compare these results for the bottom plates with the single plate at same thickness 0.9 mm.The results showed that when increase thickness of the top plate the value of residual stresses will decrease for bottom plates and when used graphite with grease between two plates gives less residual stresses (R.S = 60.173 MPa.) reverse when used Mos2 which will gives a larger residual stresses (R.S = 146.617 MPa.) in the bottom plate. Keywords: Multilayer Single Point Incremental Forming (SPIF), Residual Stresses, Lubrication.

Download Full-text

The Residual Stress State Generated by Single Point Incremental Forming of Aluminum Metal Sheets

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.371.148 ◽

2013 ◽

Vol 371 ◽

pp. 148-152 ◽

Cited By ~ 16

Author(s):

Crina Radu ◽

Eugen Herghelegiu ◽

Nicolae Catalin Tampu ◽

Ion Cristea

Keyword(s):

Residual Stresses ◽

Incremental Forming ◽

Single Point ◽

Hole Drilling ◽

Single Point Incremental Forming ◽

Cnc Machine ◽

Hole Drilling Method ◽

Residual Stress State ◽

Metal Sheets ◽

Drilling Method

Single point incremental forming (SPIF) is a process during which at any moment a very small part of the sample is actually being formed. This progressive highly localised deformation is performed by a simple tool, whose trajectory is numerical controlled by a CNC machine. Since no support for the metal sheet is used during forming, large levels of deformation occur, which in turn, induce highly non-uniform residual stresses that affect the accuracy of the processed parts. The aim of the present paper was to inspect, experimentally and by simulation, the state of the residual stresses induced in SPIFed double frustums of pyramids made by A1050. The hole drilling method was used for the experimental measurements and the LS-Dyna software for simulation.

Download Full-text