Development of precipitate size and volume fraction of niobium carbonitrides in stabilised stainless steel
Authors: Källqvist, J.; Andrén H.-O.
Source: Materials Science and Technology, Volume 16, Number 10, October 2000 , pp. 1181-1185(5)
Publisher: Maney Publishing
Abstract:Niobium carbonitride (NbX) precipitates have been studied in a niobium stabilised austenitic stainless steel AISI type 347 with approximate nominal composition Fe–0.06C–17.5Cr–11.4Ni–0.8Nb. The steel was extruded to seamless tube, solution annealed at 1100°C for 3 min, water quenched, and subsequently isothermally aged at 700°C for times up to 70 000 h. Size distribution and volume fraction of the coarse distribution (1–10 µm) of NbX particles were measured using scanning electron microscopy (SEM). The fine distribution (∼30 nm) was investigated using energy filtered transmission electron microscopy (EFTEM). Size distribution and volume fraction were determined using jump ratio images. Coarse NbX (∼0.3% volume fraction) precipitates were formed during solidification and extrusion, and were little affected by solution annealing and isothermal aging. Fine NbX (∼0.5% volume fraction) precipitates formed during solution annealing and grew during the first 800 h of aging. Precipitate size determination using EFTEM appears to give accurate results, while volume fraction determination requires homogeneous material for good results.
Document Type: Regular Paper
Affiliations: Department of Experimental Physics, Chalmers University of Technology and Göteborg University, Göteborg, Sweden, SE–412 96
Publication date: October 2000
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