Arrest of weld-decay in 304 austenitic stainless steel by twin-induced grain boundary engineering

2007 ◽  
Vol 55 (16) ◽  
pp. 5401-5407 ◽  
Author(s):  
H. Kokawa ◽  
M. Shimada ◽  
M. Michiuchi ◽  
Z.J. Wang ◽  
Y.S. Sato
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
Grain Boundary Engineering ◽  
304 Austenitic Stainless Steel

Grain Boundary Engineering for Intergranular Corrosion Resistant Austenitic Stainless Steel

2004 ◽  
Vol 261-263 ◽  
pp. 1005-1010 ◽  
Author(s):  
Hiroyuki Kokawa ◽  
Masahiko Shimada ◽  
Zhan Jie Wang ◽  
Yutaka S. Sato ◽  
M. Michiuchi
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
Thermomechanical Treatment ◽  
Intergranular Corrosion ◽  
Ferric Sulfate ◽  
Grain Boundary Engineering ◽  
Intergranular Corrosion Resistance

Optimum parameters in the thermomechanical treatment during grain boundary engineering (GBE) were investigated for improvement of intergranular corrosion resistance of type 304 austenitic stainless steel. The grain boundary character distribution (GBCD) was examined by orientation imaging microscopy (OIM). The intergranular corrosion resistance was evaluated by electrochemical potentiokinetic reactivation (EPR) and ferric sulfate-sulfuric acid tests. The sensitivity to intergranular corrosion was reduced by the thermomechanical treatment and indicated a minimum at a small roll-reduction. The frequency of coincidence-site-lattice (CSL) boundaries indicated a maximum at the small pre-strain. The ferric sulfate-sulfuric acid test showed much smaller corrosion rate in the thermomechanical-treated specimen than in the base material for long time sensitization. The optimum thermomechanical treatment introduced a high frequency of CSL boundaries and the clear discontinuity of corrosive random boundary network in the material, and resulted in the high intergranular corrosion resistance arresting the propagation of intergranular corrosion from the surface.

Grain Boundary Engineering of High-Nitrogen Austenitic Stainless Steel

2007 ◽  
pp. 4962-4967
Author(s):  
Hiroyuki Kokawa ◽  
W.Z. Jin ◽  
Zhan Jie Wang ◽  
M. Michiuchi ◽  
Yutaka S. Sato ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
Grain Boundary Engineering ◽  
High Nitrogen
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