Effect of Intercritical Heat Treatment and Volume Fraction on the Morphological Properties, Mechanical Properties, and Work Hardening Behaviour of Dual-Phase Steel

In the present study, the effect of intercritical heat treatment temperature on the tensile properties and work hardening behavior of ferritic-martensitic dual-phase steel have been investigated utilizing tensile test, microhardness measurement and microscopic observation. Plain carbon steel sheet with a thickness of 2 mm was heat treated at 760, 780, 800, 820 and 840 °C intercritical temperatures. The results showed that martensite volume fraction (Vm) increases from 32 to 81%with increasing temperature from 760 to 840 °C. The mechanical properties of samples were examined by tensile and microhardness tests. The results revealed that yield strength was increased linearly with the increase in Vm, but the ultimate strength was increased up to 55% Vm and then decreased afterward. Analyzing the work hardening behavior in term of Hollomon equation showed that in samples with less than 55% Vm, the work hardening took place in one stage and the work hardening exponent increased with increasing Vm. More than one stage was observed in the work hardening behavior when Vm was increased. The results of microhardness test showed that microhardness of the martensite is decreased by increase in heat treatment temperature while the ferrite microhardness is nearly constant for all heat-treated samples.

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Effect of Intercritical Heat Treatment on Mechanical Properties of Plain Carbon Dual Phase Steel

Mehran University Research Journal of Engineering and Technology ◽

10.22581/muet1982.1801.13 ◽

2018 ◽

Vol 37 (1) ◽

pp. 149-158

Author(s):

Imtiaz Ali Soomro ◽

◽

Muhammad Ishaque Abro ◽

Muhammad Moazam Baloch ◽

◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Dual Phase Steel ◽

Dual Phase ◽

Intercritical Heat Treatment

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Effect of Ferrite Volume Fraction on Mechanical Properties of X80 Pipeline Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.212 ◽

2014 ◽

Vol 989-994 ◽

pp. 212-215

Author(s):

J. Liu ◽

G. Zhu ◽

W. Mao

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Work Hardening ◽

Single Phase ◽

Volume Fraction ◽

Pipeline Steel ◽

X80 Pipeline Steel ◽

Hardening Behavior ◽

Two Phases ◽

Better Than

The effect of volume fraction of ferrite on the mechanical properties including strength, plasticity and wok hardening was systematically investigated in X80 pipeline steel in order to improve the plasticity. The microstructures with different volume fraction of ferrite and bainite were obtained by heat-treatment processing and the mechanical properties were tested. The work hardening behavior was analyzed by C-J method. The results show that the small amount of ferrite could effectively improve the plasticity. The work hardening ability and the ratio of yield/tensile strength with two phases of ferrite/bainite would be obviously better than that with single phase of bainite. The improvement of plasticity could be attributed to the ferrite in which more plastic deformation was afforded.

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Microstructural and Tribological Characterization of API X52 Dual-Phase Steel

10.21203/rs.3.rs-720895/v1 ◽

2021 ◽

Author(s):

Gamri Hamza ◽

Allaoui Omar ◽

Zidelmel Sami

Keyword(s):

Mechanical Properties ◽

Dual Phase Steel ◽

Volume Fraction ◽

Wear Behavior ◽

Normal Load ◽

Great Influence ◽

Dual Phase ◽

Martensite Volume Fraction ◽

Direct Quenching ◽

Disc Configuration

Abstract The effect of the morphology and the martensite volume fraction on the microhardness, the tensile, the friction and the wear behavior of API X52 dual phase (DP) steel has been investigated. Three different heat treatments were used to develop dual phase steel with different morphologies and with different amounts of martensite: Intermediate Quenching Treatment/Water (IQ); Step Quenching Treatment (SQ) and direct quenching (DQ). Tribological tests are conducted on DP steels using a ball-on-disc configuration under normal load of 5 N and at a sliding speed of 4 cm/s were used to study the friction and wear behavior of treated samples. Results show that the ferrite–martensite morphology has a great influence on the mechanical properties of dual phase steel. The steel subjected to (IQ) treatment attain superior mechanical properties compared to the SQ and the DQ treatments. On the other hand, it is also found that the friction coefficient and the wear rate (volume loss) decrease when the hardness and the martensite volume fraction increase. The steel with fine fibrous martensite provide good wear resistance.

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