Microstructure and Mechanical Properties of a Lamellar-Structured Low-Alloy TRIP Steel

Jiang Ying Meng; Zhi Geng Jia; Tong Liang Wang; Kai Fang Li; Li He Qian

doi:10.4028/www.scientific.net/MSF.1016.1188

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Microstructure of Al-2.5Fe Binary Alloy Fabricated by Laser Powder Bed Fusion
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Effect of Extrusion Temperature and Thermal Treatment on Microstructure and Mechanical Properties of Ti-1300 Alloy Tube
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Microstructure and Mechanical Properties of a Lamellar-Structured Low-Alloy TRIP Steel
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Microstructure Evolution during Multiaxial Processing of TA6V
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HomeMaterials Science ForumMaterials Science Forum Vol. 1016Microstructure and Mechanical Properties of a...

Microstructure and Mechanical Properties of a Lamellar-Structured Low-Alloy TRIP Steel

Abstract:

In this paper, we report a lamellar-structured low-alloy transformation-induced plasticity (TRIP) steel; the microstructure of the steel consists of alternate lamellae of intercritical ferrite and reverted austenite on microscale, with the latter consisting of bainitic ferrite laths and retained austenite films on nanoscale. Such a microstructure was produced by a heat treatment process similar to that for producing conventional TRIP-assisted steels, i.e. intercritical annealing followed by austempering. Nevertheless, quenched martensite rather than a mixture of ferrite and pearlite was used as the starting structure for intercritical annealing to form austenite, and the resulting austenite was then transformed to bainite by austempering treatment. This steel exhibits much enhanced strength-ductility combinations as compared with those conventional polygonal-structured low-alloy TRIP steels.