Analytical modeling of the thermomechanical behavior of ASTM F-1586 high nitrogen austenitic stainless steel used as a biomaterial under multipass deformation

作者：Bernardes Fabiano R; Rodrigues Samuel F^*; Silva Eden S; Reis Gedeon S; Silva Mariana B R; Junior Alberto M J; Balancin Oscar

来源：Materials Science and Engineering: C , 2015, 51: 87-98.

DOI：10.1016/j.msec.2015.02.040

• Biomaterial
• Recrystallization
• Precipitates
• Z-phase

Precipitation-recrystallization interactions in ASTM F-1586 austenitic stainless steel were studied by means of hot torsion tests with multipass deformation under continuous cooling, simulating an industrial laminating process. Samples were deformed at 0.2 and 03 at a strain rate of 1.0 s(-1), in a temperature range of 900 to 1200 degrees C and interpass times varying from 5 to 80 s. The tests indicate that the stress level depends on deformation temperature and the slope of the equivalent mean stress (EMS) vs. 1/F presents two distinct behaviors, with a transition at around 1100 degrees C, the non-recrystallization temperature (T-nr). Below the T-nr, strain-induced precipitation of Z-phase (NbCrN) occurs in short interpass times (t(pass) < 30 s), inhibiting recrystallization and promoting stepwise stress build-up with strong recovery, which is responsible for increasing the T-nr. At interpass times longer than 30s, the coalescence and dissolution of precipitates promote a decrease in the T-nr and favor the formation of recrystallized grains. Based on this evidence, the physical simulation of controlled processing allows for a domain refined grain with better mechanical properties.

• 出版日期2015-6-1