Effect of multiple warm rolling on microstructure and mechanical properties of 304 stainless steel prepared by aluminothermic reaction

H Abdelrahim,Peiqing La,Zhengning Li,Fuling Ma,Wei Fuma,Hb Mohamed

doi:10.1177/1687814019850998

H Abdelrahim, Peiqing La + Show 4 more

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https://doi.org/10.1177/1687814019850998

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Abstract

304 stainless steels were prepared by aluminothermic reaction method; first steels are annealed at 1000°C and then rolled at 700°C for different deformation. The microstructures evolution and mechanical properties were distinguished in details. It was found that the steel contains nanocrystalline/submicrocrystalline/microcrystalline austenite and submicrocrystalline ferrite. After rolling to a thickness reduction of 30%, 50%, and 70%, the mechanical properties of the rolled steels were substantially increased, as the deformation increased from 30% to 50%, the tensile strength increased from 650 to 1110 MPa, the yield strength increased from 400 to 665 MPa, and the elongation increased from 8% to 8.5%.

Highlights

304 stainless steel considered as a wide variety of applications due to its excellent weldability, corrosion resistance, and formability
Z Yanushkevich et al.[6] and F Chen et al.[7] have described that grain refinement could be obtained by variation the rolling direction in multi-pass rolling, which was useful to the formability of the alloy sheets
In order to comprehend the evolution of structure and the change of mechanical properties in 304 stainless steel, JW Fu et al.[14] have investigated microstructure evolution in AISI 304 stainless steel

Summary

Introduction

304 stainless steel considered as a wide variety of applications due to its excellent weldability, corrosion resistance, and formability. Many approaches have been suggested to improve the strengthening of the steel without loss more ductility such bimodal grain size distribution,[1] nanotwinned structure,[2] heat treatment,[3] the strain-induced martensitic transformation,[4] and lamellar structure.[5] In general, the yield strength of alloys could be highly enhanced by precipitation, grain refinement, and phase transformation. It is found that deformation under conditions of warm working could obtain good ductility and high tensile strength in steel. Warm rolling under conditions of deformation is a very efficient way to enhance the mechanical properties of the alloys and metals.[11,12,13]

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