Dissolution kinetics of NbC particles in the heat-affected zone of type 347 austenitic stainless steel
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Dissolution kinetics of NbC particles in the heat-affected zone (HAZ) of Type 347 austenitic stainless steel were experimentally studied by a rapid cooling method. Coupons with 1.5-mm thickness were water quenched on a GLEEBLE thermomechanical simulator at various instances during the heating portion of a welding thermal cycle. Particle dissolution kinetics data were obtained by statistical analysis of digital images of resulting microstructure. For most of the test alloys, a good correlation exists between the dissolution kinetics and the susceptibility to cracking in the HAZ. The faster the Nb-carbide particles dissolve, the more resistant the alloy is to constitutional liquation cracking. The rate at which particles dissolve seems to be affected by their stoichiometry. If Nb:C ratios in bulk alloys are closer to the ideal stoichiometry of 7.7, NbC particles formed in the alloy are more likely to be stable and, hence, slower to dissolve.
Original Publication Date
DOI of published version
Li, Leijun and Messler, Robert W., "Dissolution kinetics of NbC particles in the heat-affected zone of type 347 austenitic stainless steel" (2002). Faculty Publications. 3459.