Intercritical Heat Treatment Temperature Dependence of Mechanical Properties and Corrosion Resistance of Dual Phase Steel

Abstract

This study investigated the effect of intercritical heat treatment temperature on the tensile properties, work hardening and corrosion resistance of dual phase steel. Ferrite-martensite dual phase steel with different martensite volume fractions were obtained after heat treatment at different intercritical temperatures. Microstructure, mechanical properties of steel were measured and the corrosion resistance was evaluated via polarization test. Tensile strength of the specimens increased by increasing the martensite volume fraction up to 48.2%. Further increase in martensite volume fraction led to decrease in tensile strength. Work hardening behavior analyzing showed that in DP steel with less than 50% martensite volume fraction, the work hardening took place in one stage and by increasing the martensite volume fraction two-stage work hardening behavior was observed in the Holloman analysis. The results of polarization test showed that, the corrosion resistance of dual phase steel is higher than that of plain carbon steel with ferrite-pearlite microstructure.

Electrochemical Noise Measurements of Advanced High-Strength Steels in Different Solutions

“…This is because of the weaker galvanic couple between ferrite and martensite compared to that between ferrite and pearlite. In addition, an increasing volume fraction of martensite increases the corrosion rate [11]. The previous results are supported in reference [22] where similar behavior was found for different DP steels in a solution containing chloride ions.…”

“…In addition, it has been reported that the dual-phase steel tempered at higher temperature of 800 • C (martensite island morphology in the ferrite matrix), had better corrosion resistance properties than the dual-phase steel tempered at lower temperature of 730 • C, which consists of fibrous ferrite and martensite [10]. Abedini et al [11] mentioned that an increase in martensite amount does not favor the corrosion rate of DP steels. However, DP steel exhibited high corrosion resistance compared to ferrite-pearlite steel, due to the fact that the galvanic couple between ferrite and martensite is weaker than that between ferrite and pearlite.…”

Chemical, electrochemical, thermodynamic and adsorption study of EN8 dual-phase steel with ferrite-martensite structure in 0.5 M H2SO4 using pectin as inhibitor

“…Dualphase (DP) steels have received massive consideration in the past few decades because of increased application in the automotive industry. When compared to conventional high strength low alloyed (HSLA) steels, DP steels display improved mechanical properties (Abedini et al 2019;Salamci et al 2017). Steels with DP structure have a place with a gathering of present-day multi-phase steels described by ferrite matrix containing at least one or more phases (martensite, bainite, and leftover austenite) (Abedini et al 2019;Gerengi et al 2020;Keleştemur et al 2009;Song et al 2019).…”

“…When compared to conventional high strength low alloyed (HSLA) steels, DP steels display improved mechanical properties (Abedini et al 2019;Salamci et al 2017). Steels with DP structure have a place with a gathering of present-day multi-phase steels described by ferrite matrix containing at least one or more phases (martensite, bainite, and leftover austenite) (Abedini et al 2019;Gerengi et al 2020;Keleştemur et al 2009;Song et al 2019). The concurrence of delicate/hard phases and their connection in working conditions permit both high strength and malleability to be accomplished.…”

“…The concurrence of delicate/hard phases and their connection in working conditions permit both high strength and malleability to be accomplished. DP steels comprising of delicate ferrite and hard martensite show better mechanical properties looked at than regular HSLA steels (Abedini et al 2019;Song et al 2020). That has driven the specialists to investigate their appropriateness for various structural and constructional purposes (Katiyar et al 2019).…”