Cooling rate effect on Young's modulus and hardness of a Zr-based metallic glass

2011 ◽  
Vol 509 (7) ◽  
pp. 3269-3273 ◽  
Author(s):  
Z.Y. Liu ◽  
Y. Yang ◽  
S. Guo ◽  
X.J. Liu ◽  
J. Lu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Cooling Rate ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Rate Effect

scholarly journals Cu Precipitation Behaviors and Microscopic Mechanical Characteristics of a Novel Ultra-Low Carbon Steel

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3571
Author(s):  
Mingxue Sun ◽  
Yang Xu ◽  
Tiewei Xu
Keyword(s):  
Cooling Rate ◽  
Young’S Modulus ◽  
Vickers Hardness ◽  
Young's Modulus ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Precipitation Strengthening ◽  
Low Carbon ◽  
Cooling Rates ◽  
The Matrix

We studied the effect of Cu addition on the hardness of ultra-low carbon steels heat treated with different cooling rates using thermal simulation techniques. The microstructural evolution, Cu precipitation behaviors, variations of Vickers hardness and nano-hardness are comparatively studied for Cu-free and Cu-bearing steels. The microstructure transforms from ferritic structure to ferritic + bainitic structure as a function of cooling rate for the two steels. Interphase precipitation occurs in association with the formation of ferritic structure at slower cooling rates of 0.05 and 0.2 °C/s. Coarsening of Cu precipitates occurs at 0.05 °C/s, leading to lower precipitation strengthening. As the cooling rate increases to 0.2 °C/s, the interphase and dispersive precipitation strengthening effects are increased by 63.9 and 50.0 MPa, respectively. Cu precipitation is partially constrained at cooling rate of 5 °C/s, resulting in poor nano-hardness and Young’s Modulus. In comparison with Cu-free steel, the peak Vickers hardness, nano-hardness and Young’s Modulus are increased by 56 HV, 0.61 GPa and 55.5 GPa at a cooling rate of 0.2 °C/s, respectively. These values are apparently higher than those of Cu-free steel, indicating that Cu addition in steels can effectively strengthen the matrix.

Determination of mechanical properties of FFF 3D printed material by assessing void volume fraction, cooling rate and residual thermal stresses

2019 ◽  
Vol 25 (10) ◽  
pp. 1661-1683 ◽  
Author(s):  
Rafael Quelho de Macedo ◽  
Rafael Thiago Luiz Ferreira ◽  
Kuzhichalil Jayachandran
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Young’S Modulus ◽  
Thermal Stresses ◽  
Volume Fraction ◽  
Young's Modulus ◽  
Void Volume Fraction ◽  
Void Volume ◽  
Temperature Fields ◽  
Content Type

Purpose This paper aims to present experimental and numerical analyses of fused filament fabrication (FFF) printed parts and show how mechanical characteristics of printed ABS-MG94 (acrylonitrile butadiene styrene) are influenced by the void volume fraction, cooling rate and residual thermal stresses. Design/methodology/approach Printed specimens were experimentally tested to evaluate the mechanical properties for different printing speeds, and micrographs were taken. A thermo-mechanical finite element model, able to simulate the FFF process, was developed to calculate the temperature fields in time, cooling rate and residual thermal stresses. Finally, the experimental mechanical properties and the microstructure distribution could be explained by the temperature fields in time, cooling rate and residual thermal stresses. Findings Micrographs revealed the increase of void volume fraction with the printing speed. The variations on voids were associated to the temperature fields in time: when the temperatures remained high for longer periods, less voids were generated. The Young's Modulus of the deposited filament varied according to the cooling rate: it decreased when the cooling rate increased. The influence of the residual thermal stresses and void volume fraction on the printed parts failure was also investigated: in the worst scenarios evaluated, the void volume fraction reduced the strength in 9 per cent, while the residual thermal stresses reduced it in 3.8 per cent. Originality/value This work explains how the temperature fields can affect the void volume fraction, Young's Modulus and failure of printed parts. Experimental and numerical results are shown. The presented research can be used to choose printing parameters to achieve desired mechanical properties of FFF printed parts.

Huge reduction of Young’s modulus near a shear band in metallic glass

2016 ◽  
Vol 687 ◽  
pp. 221-226 ◽  
Author(s):  
S.V. Ketov ◽  
H.K. Nguyen ◽  
A.S. Trifonov ◽  
K. Nakajima ◽  
D.V. Louzguine-Luzgin
Keyword(s):  
Shear Band ◽  
Metallic Glass ◽  
Young’S Modulus ◽  
Young's Modulus

A technique for the measurement of Young's modulus of small metallic glass samples

1980 ◽  
Vol 15 (1) ◽  
pp. 247-248 ◽  
Author(s):  
S. H. Whang ◽  
L. T. Kabacoff ◽  
D. E. Polk ◽  
B. C. Giessen
Keyword(s):  
Metallic Glass ◽  
Young’S Modulus ◽  
Young's Modulus

Changes in the Young's modulus during structural relaxation of a metallic glass

1980 ◽  
Vol 14 (12) ◽  
pp. 1303-1308 ◽  
Author(s):  
A. Kursumović ◽  
M.G. Scott ◽  
E. Girt ◽  
R.W. Cahn
Keyword(s):  
Metallic Glass ◽  
Young’S Modulus ◽  
Structural Relaxation ◽  
Young's Modulus

scholarly journals Measurement of Elastic Properties of Brittle Materials by Ultrasonic and Indentation Methods

2019 ◽  
Vol 9 (10) ◽  
pp. 2067 ◽  
Author(s):  
Shih-Jeh Wu ◽  
Pei-Chieh Chin ◽  
Hawking Liu
Keyword(s):  
Metallic Glass ◽  
Young’S Modulus ◽  
Elastic Moduli ◽  
Young's Modulus ◽  
Brittle Materials ◽  
Acoustic Properties ◽  
Aluminosilicate Glass ◽  
Ito Glass ◽  
The Difference ◽  
Acoustic Speed

The measurements of acoustic properties of three brittle materials i.e., ITO (alkaline earth boro-aluminosilicate) glass, bulk metallic glass (BMG) and nickel-based superalloy (CM247LC) are conducted in this work to obtain various properties. The elastic moduli of materials are derived from the results by simple acoustic speed-elasticity relationship and compared with the data obtained with nanoindentation. The difference between the Young’s modulus of ITO glass by ultrasonic and nanoindentation is 0.83%, a perfect match within range error. As for BMG, the difference (Young’s modulus) is 23.59%, and 5.11% for the CM247LC superalloys. The pulse-echo method proves to be reliable for homogeneous amorphous glass, however, the elastic moduli of metallic glass and CM247LC superalloy by ultrasonic are quite different from those by nanoindentation. The difference is large enough to cover the maximal error associated with the nanoindentation method. The relationship of acoustic speed and elastic constants must be reviewed in dealing with compound materials.

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