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- W2364092844 abstract "The microstructures,morphologies of fracture surface and mechanical properties of the tempered GDL-1 bainite steel were investigated.The results show that the microstructure of the steel is the mixture of lath bainite and few granular bainite austenized at 920℃ then air cooling.The optimum strength and toughness are obtained after tempered at 300~ 350 ℃ with σ_b=1249 MPa,σ_(0.2)=929 MPa and A_(KV)=130 J.The maximum of yield/tensile ratio is 0.83 after tempered at 400℃.The retained austenite between laths and packets of bainite ferrite(BF) begins to decompose massively and forms the carbides continuously distributed along the lath and packet boundary of bainite in the temperature rang of 400~600 ℃,the carbides are also precipitated in high density dislocation area of BF,resulting in secondary hardening and irreversible temper brittleness and the impact energy and contraction ratio of area also reduced remarkably.Because of rare earth(RE) and Si element in steel which segregate on the original austenite grain boundary can restrain the precipitation of carbides along the original austenite grain boundary,so the pattern of intergranular fracture is not found." @default.
- W2364092844 created "2016-06-24" @default.
- W2364092844 creator A5078670141 @default.
- W2364092844 date "2007-01-01" @default.
- W2364092844 modified "2023-09-25" @default.
- W2364092844 title "Microstructure and Properties of Tempered GDL-1 Bainite Steel with High Strength and Toughness" @default.
- W2364092844 hasPublicationYear "2007" @default.
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