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US 8,409,367 B2Granted
Method of making a nanostructured austenitic steel sheet
AssigneeThe Hong Kong Polytechnic University
InventorsJian Lu, Aiying Chen
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Abstract
A method for producing a nanostructured austenitic sheet by consecutive martensite and austenite phase (γ/α′) transformations, in which the coarse grained austenite sheet transforms to nanocrystalline martensite by strain-induced transformation, and then generates reverse transformation to nanostructured austenite by warm rolling due to dynamic recrystallization.
Claims8
A method of producing a steel sheet including a nanostructured austenite phase, the method comprising:
- treating a steel sheet including an austenite phase by surface mechanical attrition treatment and producing a strain-induced phase transformation of at least some of the austenite phase in the steel sheet to a martensite phase;
- after the strain-induced phase transformation, heating the steel sheet to a temperature in a range from 300° C. to 0.5T, where T is the melting point of the steel sheet;
- while the steel sheet is at an elevated temperature from the heating, rolling and deforming the steel sheet and producing a phase transformation of at least some the martensite phase in the steel sheet, at surfaces of the steel sheet, to a nanocrystalline austenite phase having a mean grain size less than 100 nm;
- and
- cooling the steel sheet to room temperature
2 more elements
Dependencies are inferred from the claim text.