Abstract
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.
Highlights
Dual phase (DP) steel is identified as an important class of high strength low alloy steels (HSLA)
These steels have unique properties such as high tensile strength, high elongation, high strength to weight ratio, continuous yielding behavior and favorable ultimate tensile strength (UTS) to yield stress ratio . 1,2,3 These properties are related to microstructure of dual phase steels in which soft and ductile ferrite matrix ensures high formability; while, hard martensite phase provides strengthening effects 1,4
From the micrographs shown in Fig. 2., all microstructures consisting of proeutectoid ferrite phase and martensite
Summary
Dual phase (DP) steel is identified as an important class of high strength low alloy steels (HSLA). These steels have unique properties such as high tensile strength, high elongation, high strength to weight ratio, continuous yielding behavior and favorable ultimate tensile strength (UTS) to yield stress ratio . Besides the unique combination of mechanical properties, study of corrosion behavior of dual phase steels, to explore the true potential of these steels used in the automotive industries, seems to be necessary 6. Mechanical properties and corrosion behavior of dual phase steels and their relation to microstructure have been considered by many researchers 7,8
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