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Research Papers

Effect of Cr and Thermomechanical Processing on the Microstructure and Mechanical Properties of Advanced High-Strength Steel

[+] Author and Article Information
Abdel-Wahab El-Morsy

Mechanical Engineering Department,
Faculty of Engineering-Rabigh,
King Abdulaziz University,
P.O. Box 344,
Rabigh 21911, Saudi Arabia;
Mechanical Engineering Department,
Faculty of Engineering-Helwan,
Helwan University,
1st Sherif Street,
Helwan, Cairo 11792, Egypt
e-mails: aalmursi@kau.sa;
elmorsya@yahoo.com

Ahmed I. Z. Farahat

Plastic Deformation Department,
Central Metallurgical Research and
Development Institute,
1st Elfelezat Street,
El-Tebbin, Helwan 12422, Egypt

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 15, 2017; final manuscript received October 12, 2017; published online December 26, 2017. Assoc. Editor: Antonios Kontsos.

J. Eng. Mater. Technol 140(2), 021005 (Dec 26, 2017) (9 pages) Paper No: MATS-17-1171; doi: 10.1115/1.4038393 History: Received June 15, 2017; Revised October 12, 2017

In this work, two advanced high-strength steels (AHSS) have been developed by designing alloy systems with suitable alloying elements, Mn, Si, Al, and Cr, and postforming heat treatment processes. Thermomechanical process of ∼90% forging reductions has been applied on the designed alloys at a temperature of 1100 °C, followed by austenitizing above AC3. Four cooling rates, air-cooling, air-cooling with tempering, oil quenching with tempering, and water quenching with tempering, have been applied on the forged samples. The results revealed that the estimated tensile properties of the ferrite/bainite microstructures of alloy A, without Cr, is situated between the bands of the first and the current third generation AHSS, whereas the estimated properties corresponding to the ferrite/fine bainite with 8% retained austenite of alloy B, with Cr, is overlapped with the properties exhibited by the current third generation of AHSSs. The thermomechanical process conducted on the alloy containing Cr has developed steel with tensile strength up to 1790 MPa.

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Figures

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Fig. 1

Schematic diagram of the hot forging process and the heat treatment sequences

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Fig. 2

The first derivative curve and critical transformation temperatures of the dilatation test

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Fig. 3

Morphology (optical/SEM) of the as-cast samples for (a) alloy A and (b) alloy B

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Fig. 4

XRD peaks of the as-cast samples

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Fig. 5

Optical micrographs of hot forged air-cooled samples for (a) alloy A and (b) alloy B

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Fig. 6

Morphology of ferrite and bainite of hot forged air cooled of (a) alloy A and (b) alloy B

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Fig. 7

Morphology of hot forged air-cooled samples for (a) alloy A and (b) alloy B, etching by meta bisulfate

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Fig. 8

XRD of the hot forged air-cooled samples for (a) alloys A and (b) alloy B

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Fig. 9

Micrographs of the heat-treated samples: (a) air-cooled tempered (ACT) alloy A, (b) ACT alloy B, (c) oil-quenched tempered (OQT) alloy A, (d) OQT alloy B, (e) water-quenched tempered (WQT) alloy A, and (f) WQT alloy B

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Fig. 10

XRD peaks of the hot forged and tempered samples for (a) alloy A and (b) alloy B

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Fig. 11

True stress–true strain curve of both alloys at room temperature

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Fig. 12

Tensile properties of both alloys resulting from the tensile tests

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Fig. 13

SEM–energy dispersive spectroscopy of (a) as-cast sample for alloy B and (b) hot forged air-cooled sample for alloy B

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Fig. 14

Tensile properties (tensile strength and total elongation) resulting from tensile tests of both alloys overlaid on a property map developed by WorldAutoSteel

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Fig. 15

Work-hardening rate versus true strain of the samples after different heat treatment processes (a) for alloy A and (b) for alloy B

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