Accelerated precipitation in the AFA stainless steel Fe-20Cr-30Ni-2Nb-5Al via cold working

作者：Trotter Geneva; Rayner Garrett; Baker Ian^*; Munroe Paul R

来源：Intermetallics, 2014, 53: 120-128.

DOI：10.1016/j.intermet.2014.04.018

• Laves phases
• Phase identification
• Precipitates
• Heat treatment
• Plastic forming
• cold
• Microstructure

The effects of cold work on the microstructural evolution during aging of a solutionized alumina-forming austenitic stainless steel, Fe-20Cr-30Ni-2Nb-5Al (at.%), were investigated using scanning electron microscopy, transmission electron microscopy, and scanning transmission electron microscopy. Cold work prior to aging at either 700 degrees C or 800 degrees C facilitated the heterogeneous precipitation of both Laves phase and B2-type NiAl precipitates. While often co-located after cold work, these particles were distinct. gamma'-Ni3Al precipitates were also observed in samples aged at 700 degrees C with 90% prior cold work. Compared to material that had not been strained, defects introduced by 50 and 90% cold work at 700 degrees C and 90% cold work at 800 degrees C not only caused a more rapid precipitation in the matrix but also an increase in the total volume fraction of precipitates as compared to material that had been simply aged.

• 出版日期2014-10