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김영환,이용득,이종석,유승기 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.11
Hot ductility of 18Cr-8Ni stainless steels(type 304) containing high nitrogen was investigated in terms of fracture initiation mechanisms during high temperature deformation. The effects of nitrogen, sulphur and δ-ferrite contents on fracture mode changes were determined. It was found that, with the addition of nitrogen, the major fracture initiation mode at 1100℃ changed from brittle cracking along δ/γ interfaces to ductile cavity or micro-void formations along the austenite grain boundaries. It is due to decrease in residual δ-ferrite content with increase in nitrogen content. TEM analyses of the hot deformed microstructure showed that the transition from homogeneous dislocation tangled structure to planar array of dislocations occurred with the increase in nitrogen content. This planar slip behavior markedly reduced hot ductility. The fracture initiation mechanism was also found to be largely affected by the content of sulphur impurity, particularly in the high-nitrogen-containing steels. In these steels, a small increase in sulphur content resulted in intergranular fracture with micro-void formation along austenite grain boundaries at the temperatures below 1200℃.
김영호,이용득,유승기 한국부식학회 1996 Corrosion Science and Technology Vol.25 No.1
Microbially Influenced Corrosion(MIC) is often a significant factor in controling the long-term performance of most structural materials in industrial applications. This papers cover MIC mechanism and evaluation of stainless steels in soil and sea water environments. Papers also cover detection, monitoring and mitigation of MIC, biocides and treatments.