Effects of the alloying elements Ti, Nb, Mo and V on the grain boundary segregation of P in iron and steels

1987 ◽  
Vol 10 (4) ◽  
pp. 202-209 ◽  
Author(s):  
H. J. Grabke ◽  
R. Möller ◽  
H. Erhart ◽  
S. S. Brenner
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Alloying Elements ◽  
Grain Boundary Segregation

Effect of Grain Boundary Segregation of Phoshorus on the Hall-Petch Coefficient of Ferritic Iron

2010 ◽  
Vol 638-642 ◽  
pp. 3212-3217
Author(s):  
M. Fujihara ◽  
Nobuo Nakada ◽  
T. Tsuchiyama ◽  
Setsuo Takaki
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
The Other ◽  
Alloying Elements ◽  
Grain Boundary Segregation ◽  
If Steel ◽  
Other Hand

In IF steel without interstitials, the Hall-Petch coefficient (ky) is low as about 100 MPa･μm1/2 but it is enhnced by adding some alloying elements. Author et al. has already reported that a small amount of carbon increases ky greatly while nitrogen does not give influence so much. On the other hand, it is already known that phosphorus has a tendency to segregate at grain boundary of polycrystalline ferritic iron and that phosphorus also gives some influence to ky. However, the effect of carbon is not considered on the evaluation of ky in steels containing phosphorus. In this study, effect of phosphorus on the ky of ferritic iron was investigated by varying the grain size in Ti bearing IF-steel with different amount of phosphorus. Besides, the concentration of phosphorus and carbon at grain boundary was estimated by the grain boundary segregation model proposed by Seah et al. and the interaction between phosphorus and carbon was discussed in connection with the change of ky.

Compositional Effects on Grain Boundary Dislocation Stability in Pure Aluminum and Aluminum Alloys

1996 ◽  
Vol 458 ◽  
Author(s):  
S. G. Song ◽  
J. S. Vetrano ◽  
S. M. Bruemmer
Keyword(s):  
Aluminum Alloys ◽  
Grain Boundary ◽  
Pure Aluminum ◽  
Boundary Segregation ◽  
Alloying Elements ◽  
Grain Boundary Segregation ◽  
Boundary Dislocation ◽  
Dissociation Process ◽  
Compositional Effect ◽  
Low Concentration

ABSTRACTThe dissociation of extrinsic grain boundary dislocations in Al, Al-Mg and Al-Mg-Sn alloys was studied at various temperatures to examine the compositional effect on the dissociation process. It was found that both alloying elements (Mg and Sn) hinder the dissociation, however the effect of Sn is more significant even at a very low concentration due in part to grain boundary segregation.

Grain boundary segregation in metals

1992 ◽  
Vol 50 (2) ◽  
pp. 1204-1205
Author(s):  
C.L. Briant
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Material Properties ◽  
Electron Spectroscopy ◽  
High Vacuum ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Local Concentration ◽  
The One

Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the bulk concentration of the segregant. The importance of this problem lies in the fact that grain boundary segregation can affect many material properties such as fracture, corrosion, and grain growth.One of the best ways to study grain boundary segregation is with Auger electron spectroscopy. This spectroscopy is an extremely surface sensitive technique. When it is used to study grain boundary segregation the sample must first be fractured intergranularly in the high vacuum spectrometer. This fracture surface is then the one that is analyzed. The development of scanning Auger spectrometers have allowed researchers to first image the fracture surface that is created and then to perform analyses on individual grain boundaries.

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