Microstructure and Properties of Ultrafine-Grained Steel Produced by Warm Compression of Martensite

Xin Zhao; Xiao Ling Yang; Tian Fu Jing

doi:10.4028/www.scientific.net/MSF.682.205

Paper Titles

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Microstructures and Mechanical Properties of Fcc Pure Metals with Different Stacking Fault Energies by Equal Channel Angular Pressing
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Microstructure and Properties of Ultrafine-Grained Steel Produced by Warm Compression of Martensite
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Improvement of Strength of Mg-12Gd-3Y-0.5Zr Alloys Processed by Combination of ECAP and Extrusion
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Erosion Wear Property of Surface Diffusion Alloyed Coatings on Magnesium Alloy
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Damping Behavior and Mechanism of Graphite and Al₂O₃ Particles Reinforced Al Matrix Composites
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Fatigue Property and Fatigue Cracks of Ultra-Fine Grained Copper Processed by Equal-Channel Angular Pressing
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HomeMaterials Science ForumMaterials Science Forum Vol. 682Microstructure and Properties of Ultrafine-Grained...

Microstructure and Properties of Ultrafine-Grained Steel Produced by Warm Compression of Martensite

Abstract:

Specimens of medium carbon steel were quenched and warm-compressed on a Gleeble 3500 Machine. The microstructure of the specimens was studied by using an optical microscope and a transmission electron microscopy. And the properties were investigated by using tensile tests and hardness tests. Results show that the starting microstructure is lath martensite with a small amount of flake martensite. After 50% compression at 550-650°C, ultrafine grains can be observed in the specimens. The microstructure of the specimens compressed at 600°C is equiaxed ultrafine ferrite grains + nano-carbides and a good combination of strength and ductility is obtained. The tensile strength and total elongation are 861MPa and 19.1%, respectively. The hardness is 233.81Hv.