Mechanical Characterisation of the Effect of Various Forming Processes Applied to Commercially Pure Titanium

This paper illustrates the effect of three forming processes viz. laser forming, mechanical forming and a combination process consisting of a laser forming step followed by a mechanical forming step, on the mechanical properties of commercially pure titanium. All three processes resulted in samples...

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Vydáno v:Materials characterization Ročník 96; s. 206 - 212
Hlavní autoři: Els-Botes, A., Fidder, H., Woudberg, S., McGrath, P.J.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York, NY Elsevier Inc 01.10.2014
Elsevier
Témata:
Applied sciences
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Fatigue
Fatigue testing
Forming
Impact tests
Laser
Lasers
Materials science
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Production methods
Residual stress
Solidification
Titanium
Titanium
Fatigue
Forming
Microstructure
Laser
Forming processes
Mechanical properties
ISSN:1044-5803, 1873-4189
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Shrnutí:This paper illustrates the effect of three forming processes viz. laser forming, mechanical forming and a combination process consisting of a laser forming step followed by a mechanical forming step, on the mechanical properties of commercially pure titanium. All three processes resulted in samples having a similar final radius of curvature. Evaluation of the formed samples includes residual stress measurements, fatigue testing, Charpy impact testing, microhardness measurements and microstructure evaluation. All results were compared to the various forming methods in order to determine which forming method is more suitable for which type of loading condition i.e. impact loading or cyclic loading. Fatigue testing of components produced by the various forming methods revealed that the laser forming process provided the best results when a high load was applied whereas at lower applied loads, the mechanical forming process showed the highest number of cycles to failure. Charpy impact testing done at room temperature and at a sub-zero temperature of −40°C revealed that the laser forming process negatively affected the toughness of the material. Residual stress measurements showed that the laser forming process resulte'd in the highest value of surface relieved residual stress values compared to the other two processes. •The mechanical properties of titanium decreased after various forming processes.•The microstructure of Ti changed after laser forming, but not the hardness.•Mechanical forming produced lower residual stresses than laser forming.•At low fatigue load conditions the residual stress is the dominate factor.•At high fatigue load conditions the microstructure is the dominate factor.
Bibliografie:ObjectType-Article-1
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content type line 23
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2014.08.012