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توسعه فولاد نانوساختار با استفاده از فرایند ترمومکانیکی پیشرفته
افراسیابی، یاصر Afrasiabi, Yaser
Development of Submicron/Nanostructured HSLA Steel Using Thermomechanical Treatment
Afrasiabi, Yaser | 2012
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 43529 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Karimi Tahri, Ali
- Abstract:
- Nanocrystalline steel was developed by severe cold-rolling and subsequent annealing of HSLA steel with an original microstructure of lath martensite. Specimens are austenitized at 1000 ºC for 30 min followed by quenching in brine. The quenched specimens are cold rolled with 80% to 90 % reduction and then annealed at temperatures from 400 to 700ºC for 10 to 120 min.The specimens annealed at temperature 500oC for 60 min showed the multiphased ultrafine structure composed of equiaxed ultrafine ferrite grains with the mean grain size of 180 nm, nano-carbides distributed uniformly and blocks of tempered martensite. The produced nanostructured steel exhibited a yield stress and UTS, of 1280 MPa and 1350 MPa, respectively which are about twice those of the as received steel, with 12% elongation
- Keywords:
- Martensite ; Nanostructure ; Cold Rolling ; Annealing ; High Strength Low Alloy (HSLA)Steel
- محتواي پايان نامه
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