Effect of Nb on microstructure of medium-manganese trip steel during critical annealing

doi:10.13251/j.issn.0254-6051.2020.12.041

Abstract

Abstract: Carbide evolution behavior and the effects of niobium on the microstructure, retained austenite volume fraction and stability of two hot-rolled medium-manganese TRIP steels with and without niobium addition and under different intercritical annealing processes were studied by means of field emission scanning electron microscopy (FE-SEM). The results show that after the intercritical annealing treatment, an (ultrafine grained ferrite+retained austenite) dual-phase structure is obtained. With the increase of annealing temperature, the volume fraction of retained austenite first increases and then decreases; as the annealing time increases, the carbides dissolve gradually, the volume fraction of retained austenite increases gradually until equilibrium then unchanged. The Nb addition can refine austenite grains, delay carbide dissolution, delay austenite transformation, increase film austenite amount, and improve austenite stability.

Key words: Nb, medium-manganese TRIP steel, intercritical annealing, carbide evolution behavior, retained austenite

CLC Number:

TG142.3

Han Fuguang, Li Yan, Zhao Zengwu, Ding Wei. Effect of Nb on microstructure of medium-manganese trip steel during critical annealing[J]. Heat Treatment of Metals, 2020, 45(12): 212-217.

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