Nanostructured bainitic steel obtained by powder metallurgy approach: structure, transformation kinetics and mechanical properties

作者：Lonardelli I^*; Girardini L; Maines L; Menapace C; Molinari A; Bhadeshia H K D H

来源：Powder Metallurgy, 2012, 55(4): 256-259.

DOI：10.1179/0032589912Z.00000000079

A PM approach is investigated in the context of extremely fine low temperature bainitic steels with a reasonable combination of ultimate tensile strength and uniform elongation. The strategy consists of three steps. First, ball milling is used for mechanical alloying and to create a large density of interfaces prior to sintering. In the second step, spark plasma sintering is used as a rapid consolidation process to retain a very fine and homogeneous structure after sintering. The isothermal heat treatment which leads to bainite can then be done at a low austenitisation temperature (860 degrees C) for a few minutes, leading to a small initial austenite grain size. A fine grain size promotes the rapid transformation of the austenite into bainite. The characteristics of a nanostructured Fe-Ni-C bainitic steel obtained after mechanical alloying and nanostructuring of the powder, spark plasma sintering and final heat treatment are reported.

• 出版日期2012-9