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Impact Toughness Seatteriug of Bainitie Steel in the Ductile-brittle Transition Temperature Region
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Impact Toughness Seatteriug of Bainitie Steel in the Ductile-brittle Transition Temperature Region
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Journal Article
Impact Toughness Seatteriug of Bainitie Steel in the Ductile-brittle Transition Temperature Region
2016
Overview
The impact toughness scattering in the ductile-brittle transition temperature （DBTT） region was experimentally examined on mixed and homogeneous grains of low alloy high strength bainitic steel under dynamic loading conditions. The results revealed that the mixed grain microstructure had larger impact toughness scattering than the homogeneous one, and the impact toughness scattering was mainly caused by the scattering in the cleavage fractttre stress σf. The value of σf. is related to the size of the microcrack formed in the bainitic packet. When a bainitic packet-sized microcrack propagates from one bainitic packet into the adjacent packet, cleavage fracture occurs. The cleavage fracture is controlled by the few coarse packets in the microstructures, and the σf scattering is influenced by the varied distances/relative locations between these coarse packets, and homogenizing the distribution of fine bainitic packet sizes is an effective way to reduce the impact toughness scattering in the DBTT region.
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