Effect of annealing temperature on microstructure and properties of ferrite/martensite dual-phase steel

doi:10.13251/j.issn.0254-6051.2020.09.023

Abstract

Abstract: Effect of intercritical annealing temperature on the microstructure and mechanical properties of a ferrite/martensite dual-phase steel was investigated by means of scanning electron microscopy (SEM),room-temperature tensile and impact tests.The results show that the microstructure of the hot rolled dual-phase steel is composed of ferrite+martensite,and the content of ferrite is 32.8%.With the annealing temperature increasing from 720 C to 830 9C,the ferrite content decreases from 45.7% to 23.6%,and the martensite content increases gradually.The yield ratio of the tested steel is increased from 50% of that hot rolled to 60% of that annealed at 830 C,and the relationship between the impact absorbed energy and the ferrite content is linear.

Key words: ferrite/martensite dual-phase steel, intercritical annealing, microstructure, mechanical properties

CLC Number:

TG142.3

Suo Zhongyuan, Du Yang, Fu Liming, Shan Aidang. Effect of annealing temperature on microstructure and properties of ferrite/martensite dual-phase steel[J]. Heat Treatment of Metals, 2020, 45(9): 125-128.

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