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, Saudi Arabia; Mechanical Engineering Department, Faculty of Engineering-Helwan, Helwan University, Cairo, Egypt

Ahmed Farahat

Plastic Deformation Department, Central Metallurgical Research & Development Institute, Egypt

1Corresponding author.

ASME doi:10.1115/1.4038393 History: Received June 15, 2017; Revised October 12, 2017


In this work, two advanced high strength steels have been developed by designing alloy systems with suitable alloying elements, Mn, Si, Al, and Cr, and post-forming 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 1st and the current 3rd 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 3rd generation of advanced high strength steels. The thermomechanical process conducted on the alloy containing Cr has developed steel with tensile strength up to 1790 MPa.

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