New methods for analyzing gas forming elements in bulk and nano-sized metallic materials

摘要

@@1.Introduction The quality of metal products is determined by not only their structure and bulk chemical composition but also the chemical forms of nitrogen,carbon and oxygen present in the matrix,namely by their distribution be tween a solid solution and different species,such as carbides,nitrides and oxides.Nonmetallic inclusions, which are present in a steel matrix in a significant amount,are known to be main sites of fatigue and ten sile crack nucleation.