ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Large amount of nitrogen addition into an austenitic stainless steel can improve themechanical properties and corrosion resistance remarkably as far as the nitrogen is in solid solution.However, once the nitrogen precipitates as nitride, it results in deteriorations in the properties of thehigh nitrogen austenitic stain steel. During welding, a high nitrogen austenitic stainless steel isready to precipitate rapidly immense amounts of chromium nitride in the heat affected zone (HAZ),as intergranular or cellular morphologies at or from grain boundaries into grain interiors. The nitrideprecipitation reduces seriously the local mechanical properties and corrosion resistance. The presentauthors have demonstrated that a thermomechanical-processing as grain boundary engineering(GBE) inhibited intergranular chromium carbide precipitation in the HAZ of a type 304 austeniticstainless steel during welding and improved the intergranular corrosion resistance drastically. In thepresent study, the thermomechanical-processing was applied to a high nitrogen austenitic stainlesssteel containing 1 mass% nitrogen to suppress the nitride precipitation at or from grain boundariesin the HAZ during welding by GBE. GBE increases the frequency of coincidence site lattice (CSL)boundaries in the material so as to improve the intergranular properties, because of strong resistanceof CSL boundaries to intergranular deteriorations. The optimum parameters in thethermomechanical-processing brought a very high frequency of CSL boundaries in the highnitrogen austenitic stainless steel. The GBE suppressed the intergranular and cellular nitrideprecipitation in the HAZ of the high nitrogen austenitic stainless steel during welding
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4962.pdf
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