Mechanism of hot ductility loss in C–Mn steels based on nonequilibrium grain boundary segregation of impurities

2015 ◽  
Vol 30 (10) ◽  
pp. 1701-1714
Author(s):  
Zongwen Zheng ◽  
Hongyao Yu ◽  
Zhenjun Liu ◽  
Tingdong Xu ◽  
R. Devesh K. Misra
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Hot Ductility ◽  
Ductility Loss ◽  
Image Position ◽  
Segregation Of Impurities

Abstract

Improvement of hot ductility of C-Mn Steel containing arsenic by rare earth Ce

2018 ◽  
Vol 115 (4) ◽  
pp. 419 ◽  
Author(s):  
Wenbin Xin ◽  
Jing Zhang ◽  
Guoping Luo ◽  
Ruifen Wang ◽  
Qingyong Meng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Fracture Morphology ◽  
Grain Boundary Segregation ◽  
Hot Ductility ◽  
Ductility Trough ◽  
Reduction Of Area ◽  
Mn Steel ◽  
Ce Content

The effect of different Ce content on the hot ductility of C-Mn steel containing arsenic was investigated at the temperature ranging from 700 to 1100 °C conducting Gleebel-1500 thermal-mechanical simulator. The reduction of area (RA%) was used to evaluate the hot ductility. The 0.16 mass% As widened the ductility trough range and especially, decreased the RA value at 850–950 °C. Conversely, adding Ce in the steel could remedy the arsenic-induced hot ductility deterioration. Moreover, with the increase of Ce content from 0 to 0.035 mass%, the RA value at 800–950 °C significantly increased, compared to that of the arsenic steel. When the content of Ce reached 0.027–0.035 mass%, the RA value at 800–850 °C was even higher than that of steel without As. Besides, the corresponding fracture morphology was changed from intergranular feature to ductile and/or interdendritic feature. Grain refinement by Ce addition, the formation of arsenious rare earth inclusions and grain boundary segregation of Ce were considered to improve the hot ductility of the steel containing As.

Recent trends and open questions in grain boundary segregation

2018 ◽  
Vol 33 (18) ◽  
pp. 2647-2660 ◽  
Author(s):  
Pavel Lejček ◽  
Monika Všianská ◽  
Mojmír Šob
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Open Questions ◽  
Recent Trends ◽  
Image Position

Abstract

Grain boundary segregation of impurities and point defects in ionocovalent materials

2006 ◽  
Vol 26 (2-3) ◽  
pp. 169-176 ◽  
Author(s):  
S. Benlamari ◽  
N. Hacene Djaballah ◽  
D.E. Mekki ◽  
C.J. Monty
Keyword(s):  
Grain Boundary ◽  
Point Defects ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Segregation Of Impurities

Grain Boundary Segregation of Impurities During Polycrystalline Colloidal Crystallization

2015 ◽  
Vol 15 (12) ◽  
pp. 5685-5692 ◽  
Author(s):  
Sumeng Hu ◽  
Jun Nozawa ◽  
Haruhiko Koizumi ◽  
Kozo Fujiwara ◽  
Satoshi Uda
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Colloidal Crystallization ◽  
Segregation Of Impurities

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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