Evaluation of Grain Boundary Effect on the Strength of Fe-C Martensitic Steels through Nanoindentation Technique

2005 ◽  
pp. 4113-4116
Author(s):  
Takahito Ohmura ◽  
Kaneaki Tsuzaki
Keyword(s):  
Grain Boundary ◽  
Boundary Effect ◽  
Martensitic Steels ◽  
Nanoindentation Technique ◽  
Grain Boundary Effect

Evaluation of Grain Boundary Effect on the Strength of Fe-C Martensitic Steels through Nanoindentation Technique

2005 ◽  
Vol 475-479 ◽  
pp. 4113-4116 ◽  
Author(s):  
Takahito Ohmura ◽  
Kaneaki Tsuzaki
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Boundary Effect ◽  
Martensitic Steels ◽  
Tempering Temperature ◽  
Nanoindentation Technique ◽  
The Matrix ◽  
Grain Boundary Effect ◽  
Grain Boundary Strengthening

Nanoindentation measurements were performed for Fe-C based martensitic steels, and then the strengthening factors such as grain boundary effect were evaluated. Nanohardness of the matrix of the martensite is lower than that expected from macroscopic hardness, indicating that the grain boundary effect is significant for the macroscopic strength of the Fe-C martensite. A remarkable decrease of the grain boundary effect was found at the tempering temperature of 673 K, which is due to a disappearance of film-like carbides on grain boundaries. These results will be discussed in light of the interpretations of grain boundary strengthening.

Grain boundary effect on the β-boron electrical transport properties at high pressure

2010 ◽  
Vol 97 (17) ◽  
pp. 174101 ◽  
Author(s):  
Ming Li ◽  
Jie Yang ◽  
Karim Snoussi ◽  
Lixin Li ◽  
Huixin Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Grain Boundary ◽  
Transport Properties ◽  
Electrical Transport ◽  
Boundary Effect ◽  
Electrical Transport Properties ◽  
Grain Boundary Effect

Grain boundary effects in NTC-PTC composite thermistor materials

1999 ◽  
Vol 14 (1) ◽  
pp. 120-123 ◽  
Author(s):  
D. J. Wang ◽  
J. Qiu ◽  
Y. C. Guo ◽  
Z. L. Gui ◽  
L. T. Li
Keyword(s):  
Energy Level ◽  
Grain Boundary ◽  
Boundary Effect ◽  
Complex Impedance ◽  
Negative Temperature ◽  
Impedance Analysis ◽  
Composite Effect ◽  
Complex Impedance Analysis ◽  
Temperature Coefficient Of Resistivity ◽  
Grain Boundary Effect

Yttrium-doped (Sr0.45Pb0.55)TiO3 ceramics have been studied by complex impedance analysis. As a sort of NTC-PTC composite thermistor, it exhibited a significantly large negative temperature coefficient of resistivity below Tc in addition to the ordinary PTC characteristics above Tc. It is found that the NTC effect in NTC-PTC materials was not originated from the deep energy level of donor (bulk behavior), but from the electrical behavior of the grain boundary. Therefore, the NTC-PTC composite effect was assumed to be a grain boundary effect, and yttrium was a donor at shallow energy level. The NTC-PTC ceramics were grain boundary controlled materials.

scholarly journals Grain Boundary Effect on Diffusion of Hydrogen in Pure Aluminum

1991 ◽  
Vol 32 (12) ◽  
pp. 1109-1114 ◽  
Author(s):  
Minoru Ichimura ◽  
Yasushi Sasajima ◽  
Mamoru Imabayashi
Keyword(s):  
Grain Boundary ◽  
Boundary Effect ◽  
Pure Aluminum ◽  
Diffusion Of Hydrogen ◽  
Grain Boundary Effect

Grain-boundary effect in zirconia stabilized with yttria and calcia by electrical measurements

2003 ◽  
Vol 103 (2) ◽  
pp. 108-114 ◽  
Author(s):  
Ying Li ◽  
Mingshuai Liu ◽  
Jianghong Gong ◽  
Yunfa Chen ◽  
Zilong Tang ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Effect ◽  
Electrical Measurements ◽  
Grain Boundary Effect
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