Effects of Ti addition on the microstructural and mechanical property evolution of FeCrB alloys have been systematically studied through experiments and modeling. Microstructural analysis reveals that Ti addition can induce the formation of in situ nanoparticles which can be mainly divided into two categories based on their distribution types. The first are the interfacial ones accumulating on the boride surface to control their growth, while the second are the intragranular ones distributed in the matrix to reinforce the FeCrB alloys. Model predictions show that the nanoparticle-induced growth restriction is responsible for the microstructural refinement. The refined microstructure and reinforcing nanoparticles can lead to the enhanced mechanical properties of FeCrB alloys. When the Ti addition reaches 1.4 wt pct, the FeCrB alloy exhibits the most refined and homogeneous microstructure and thus the optimal performance with its microhardness, macrohardness, ultimate tensile strength, elongation, impact toughness, and the wear-resistant performance are increased by 31.9, 29.0, 39.7, 128.6, 27.3, and 350 pct, respectively, compared with the base alloy.
|Number of pages||13|
|Journal||METALLURGICAL AND MATERIALS TRANSACTIONS A: PHYSICAL METALLURGY AND MATERIALS SCIENCE|
|Publication status||Published - Sep 2020|
|MoE publication type||A1 Journal article-refereed|