TY - JOUR
T1 - Reassessment of the effects of laser surface melting on IGC of SUS 304
AU - Yang, Sen
AU - Wang, Zhanjie
AU - Kokawa, Hiroyuki
AU - Sato, Yutaka S.
N1 - Funding Information:
One of the authors (S. Yang) is grateful to Japan Society for the Promotion of Science for offering a JSPS fellowship. The authors would like to express their gratitude to Dr. Y.S. Kang, Mr. A. Honda and Mr. Isago for their technical support. The partial support of this work by Program for New Century Excellent Talents in University from Ministry of Education of China and Science Research Foundation of IMUT (ZD200521) are also acknowledged.
PY - 2008/2/15
Y1 - 2008/2/15
N2 - Laser surface remelting (LSM) experiments were conducted on surface of 304 stainless steel using a 2 kW CW Nd: YAG laser and the effects of LSM on the intergranular corrosion (IGC) resistance of 304 stainless steel were reassessed from view point of grain boundary engineering (GBE). LSM could make the sensitized microstructures locally desensitize, and could improve the IGC resistance. The improved IGC resistance of the laser-surface-melted specimens could be attributed in part to Cr redistribution at the boundaries of the cells and grains and in part to existence of a large amount of low energy Σ(1 ≤ Σ ≤ 29) boundaries and the formation of 〈0 0 1〉(1 0 0) texture. However, the laser-surface-melted specimens became much more susceptible to IGC in the sensitization temperature region, and the corrosion rate of the resensitized specimen was even higher than that of the base materials under the same sensitization condition. A subsequent annealing treatment changed the grain boundary character distribution (GBCD) remarkably and the IGC resistance of the processed specimens was improved.
AB - Laser surface remelting (LSM) experiments were conducted on surface of 304 stainless steel using a 2 kW CW Nd: YAG laser and the effects of LSM on the intergranular corrosion (IGC) resistance of 304 stainless steel were reassessed from view point of grain boundary engineering (GBE). LSM could make the sensitized microstructures locally desensitize, and could improve the IGC resistance. The improved IGC resistance of the laser-surface-melted specimens could be attributed in part to Cr redistribution at the boundaries of the cells and grains and in part to existence of a large amount of low energy Σ(1 ≤ Σ ≤ 29) boundaries and the formation of 〈0 0 1〉(1 0 0) texture. However, the laser-surface-melted specimens became much more susceptible to IGC in the sensitization temperature region, and the corrosion rate of the resensitized specimen was even higher than that of the base materials under the same sensitization condition. A subsequent annealing treatment changed the grain boundary character distribution (GBCD) remarkably and the IGC resistance of the processed specimens was improved.
KW - Austenite stainless steel
KW - Grain boundary character distribution
KW - Intergranular corrosion resistance
KW - Laser surface remelting
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U2 - 10.1016/j.msea.2007.03.103
DO - 10.1016/j.msea.2007.03.103
M3 - Article
AN - SCOPUS:37648999281
SN - 0921-5093
VL - 474
SP - 112
EP - 119
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -