scholarly journals Characterization of microstructure and fatigue life of CP titanium grade 2 specimens subject to various bending processes

2013 ◽  
Author(s):  
H. Fidder ◽  
A. Botes ◽  
S. Woudberg ◽  
P. J. McGrath
Keyword(s):  
Fatigue Life ◽  
Titanium Grade

Influence of Cyclic Deformation Induced Phase Transformation on the Fatigue Behavior of the Austenitic Steel X6CrNiNb1810

2014 ◽  
Vol 891-892 ◽  
pp. 1231-1236 ◽  
Author(s):  
Andreas Sorich ◽  
Marek Smaga ◽  
Dietmar Eifler
Keyword(s):  
Phase Transformation ◽  
Fatigue Life ◽  
Austenitic Steel ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Fatigue Behavior ◽  
Cyclic Hardening ◽  
Martensite Formation ◽  
Destructive Testing

The austenitic steel X6CrNiNb1810 (AISI 347) was investigated in isothermal total strain-controlled tests at ambient temperature and T = 300 °C in the LCF-and HCF-range. The phase transformation from paramagnetic austenite (fcc) into ferromagnetic α´-martensite ́(bcc) leads to cyclic hardening and to an increase in fatigue life. At 300 °C no α´-martensite formation was observed in the LCF-range and the cyclic deformation behavior depends basically on cyclic hardening processes due to an increase of the dislocation density, followed by cyclic saturation and softening due to changes in the dislocation structure. In the HCF-range an increase in fatigue life was observed due to ε- and α´-martensite formation. Measurements of the mechanical stress-strain-hysteresis as well as temperature and magnetic properties enable a characterization of the cyclic deformation behavior and phase transformation in detail. The changes in the physical data were interpreted via microstructural changes observed by scanning-and transmission-electron-microscopy as well as by x-ray investigations. Additionally electromagnetic acoustic transducers (EMATs) developed from the Fraunhofer Institute of Non-destructive Testing (IZFP) Saarbrücken were used for an in-situ characterization of the fatigue processes.

scholarly journals Characterization of Porous Phosphate Coatings Enriched with Magnesium or Zinc on CP Titanium Grade 2 under DC Plasma Electrolytic Oxidation

Metals ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 112 ◽  
Author(s):  
Krzysztof Rokosz ◽  
Tadeusz Hryniewicz ◽  
Sofia Gaiaschi ◽  
Patrick Chapon ◽  
Steinar Raaen ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Dc Plasma ◽  
Phosphate Coatings ◽  
Electrolytic Oxidation ◽  
Titanium Grade ◽  
Plasma Electrolytic ◽  
Porous Phosphate

FATIGUE CHARACTERIZATION OF A THERMOPLASTIC ELASTOMER

2017 ◽  
Vol 90 (2) ◽  
pp. 367-380 ◽  
Author(s):  
W. V. Mars ◽  
M. D. Ellul
Keyword(s):  
Fatigue Life ◽  
Thermoplastic Elastomer ◽  
Applied Strain ◽  
Strain Response ◽  
Additional Measurement ◽  
Static Loads ◽  
Elastic Part ◽  
New Material ◽  
The Subject

ABSTRACT The capacity to resist crack development in an olefinic thermoplastic elastomer (TPE) has been measured via a set of experiments that quantify (1) the fracture mechanical strength of the material under quasi-static loads, (2) the rate of growth of a crack under dynamic solicitations as a function of the energy release rate, and (3) the size of crack precursors in new material. Because the subject TPE exhibited strong inelasticity in the stress–strain response, it also was necessary to characterize the development of an inelastic set under cyclic loading as a function of the applied strain. Combined with the multiplicative kinematic split, this additional measurement yields the elastic part of the strain. It also enables engineering calculations to be made of fatigue life.

scholarly journals Characterization of Fatigue Life of Ultrafine Grained NiTi Superelastic Wires Under Uniaxial Loading

2015 ◽  
Vol 9 ◽  
pp. 326-334 ◽  
Author(s):  
Sebastián Jaureguizahar ◽  
Hugo Soul ◽  
Mirco Chapetti ◽  
Alejandro Yawny
Keyword(s):  
Fatigue Life ◽  
Uniaxial Loading ◽  
Ultrafine Grained
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