Two types of boron segregation at austenite grain boundaries and their mutual relation

1990 ◽  
Vol 25 (3) ◽  
pp. 1739-1744 ◽  
Author(s):  
Xu Tingdong ◽  
Song Shenhua ◽  
Yuan Zhexi ◽  
Yu Zongsen
Keyword(s):  
Grain Boundaries ◽  
Mutual Relation ◽  
Boron Segregation ◽  
Austenite Grain

A Mechanism for Solute Segregation to Grain Boundaries

1989 ◽  
Vol 159 ◽  
Author(s):  
Chu Youyi ◽  
Zhan Sanhong
Keyword(s):  
Grain Boundaries ◽  
Solute Atom ◽  
Local Equilibrium ◽  
Isothermal Holding ◽  
Boundary Segregation ◽  
Alloy System ◽  
Solute Segregation ◽  
Boron Segregation ◽  
Austenite Grain ◽  
Equilibrium Segregation

ABSTRACTBased an the local equilibrium among vacancies, solute atans and vacancy-solute atom complexes, a mechanism for solute segregation to grain boundaries is suggested for a alloy system with binding energy of complex S≫kT. A set of dynamic equations for grain boundary segregation is ived, which can describe both equilibrium and nonequilibrium segregations, as the effect of the equilibrium segregation is taken into account in the bonndary condition. Theoretical calculation is made by computer for boron segregation at austenite grain boundaries as functions of isothermal holding time, cooling rate and quenching teaperature, which agree well with experimental results.

Non-equilibrium segregation of boron at austenite grain boundaries

1991 ◽  
Vol 10 (20) ◽  
pp. 1232-1234 ◽  
Author(s):  
Shenhua Song ◽  
Zhexi Yuan ◽  
Tingdong Xu
Keyword(s):  
Grain Boundaries ◽  
Austenite Grain ◽  
Equilibrium Segregation ◽  
Non Equilibrium

A quantitative atom probe study of the Nb excess at prior austenite grain boundaries in a Nb microalloyed strip-cast steel

2012 ◽  
Vol 60 (13-14) ◽  
pp. 5049-5055 ◽  
Author(s):  
Peter J. Felfer ◽  
Chris R. Killmore ◽  
Jim G. Williams ◽  
Kristin R. Carpenter ◽  
Simon P. Ringer ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Prior Austenite ◽  
Cast Steel ◽  
Atom Probe ◽  
Austenite Grain ◽  
Strip Cast ◽  
Prior Austenite Grain

Nb segregation at prior austenite grain boundaries and defects in high strength low alloy steel during cooling

2017 ◽  
Vol 115 ◽  
pp. 165-169 ◽  
Author(s):  
Xianglong Li ◽  
Ping Wu ◽  
Ruijie Yang ◽  
Shoutian Zhao ◽  
Shiping Zhang ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Alloy Steel ◽  
Prior Austenite ◽  
High Strength ◽  
Low Alloy Steel ◽  
Austenite Grain ◽  
Prior Austenite Grain

Cavitation control in steels of high residual element content

1980 ◽  
Vol 295 (1413) ◽  
pp. 305-305 ◽  
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Prior Austenite ◽  
Low Alloy Steels ◽  
Boundary Zone ◽  
Austenite Grain ◽  
Alloy Steels ◽  
Austenite Grain Boundary ◽  
Prior Austenite Grain ◽  
Transverse Boundary

The cavitational mode of failure of prior austenite grain boundaries in bainitic creep-resisting low alloy steels is now well established as a principal factor in the high incidence of cracking problems which has developed on modern power plant in recent years. The microstructural features dominating the cavitation process at the reheat temperature in a ½CMV bainitic steel of high classical residual level have been determined. The prior austenite grain boundaries become zones of comparative weakness ca . 1 pm thick at 700 °C and are incapable of sustaining significant shear loads. Deformation is therefore initiated by a relaxation of load, through a process of prior austenite grain boundary zone shear, from inclined to transverse boundaries such that a concentration of normal stress develops across the latter. The overall deformation is thereafter determined by cavitation of the transverse boundary zones, the necessary inclined boundary displacements being accommodated by further grain boundary zone shear. Transverse boundary cavitation is shown to be an essentially time-independent process of localized ductile microvoid coalescence resulting from the plastic deformation of the boundary zone.

The Crystallography of Lath Martensite Formed at Austenite Grain Boundaries in Fe-Ni-Mn Alloy

ICOMAT ◽  
2013 ◽  
pp. 649-653 ◽  
Author(s):  
Shigekazu Morito ◽  
Jun Nishikawa ◽  
Takuya Ohba ◽  
Tadashi Furuhara ◽  
Tadashi Maki
Keyword(s):  
Grain Boundaries ◽  
Lath Martensite ◽  
Austenite Grain
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