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The secondary hardened ultra-high strength steel Ferrium S53 microstructure and mechanical properties of

Author: ZhangXiaoLei
Tutor: ZhaoKunYu；WangChunXu
School: Kunming University of Science and Technology
Course: Materials Physical Chemistry,
Keywords: Ferrium S53 Secondary hardening Ultra-high-strength steel Strengthening and toughening M2C Reverted austenite
CLC: TG142.1
Type: Master's thesis
Year: 2010
Downloads: 76
Quote: 0
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Abstract


From the 1950s to the present , after more than half a century of research and development , the ultra-high -strength steel has become a specialized disciplines of materials science and engineering professional development and gradually from the initial low alloy high strength steel to high alloy secondary hardening ultra-high-strength steel . In this thesis, a new secondary hardening the microstructure and mechanical properties of ultra-high -strength steel Ferrium S53 . Ferrium S53 steel is the end of the 20th century by the United States QuesTak developed a structure with the secondary hardened ultra-high strength corrosion resistant steel , the nominal composition of 0.21C - 14Co - 10Cr - 5.5Ni - 2Mo -1W -0.3V . From the existing data , Ferrium S53 steel tensile strength of about 1930MPa, yield strength of about 1580MPa , the fracture toughness is greater than 55MPa · m1 / 2 , its mechanical properties are quite existing 300M steel , but with more than 300M the advantages of the steel corrosion . In accordance with the nominal composition of Ferrium S53 steel prototype furnace test steel , mechanical tests, metallographic electron microscopy , scanning electron microscopy , transmission electron microscopy and X-ray diffraction analysis of different tempering conditions under Ferrium S53 steel generated in the mechanical properties, the process of organization and tempering precipitated phase of the study , analysis of the phase transformation of the mechanical variation of the performance in the tempering process is summarized as well as organizations and precipitated . Was found through experiments that Ferrium S53 more residual austenite steel at 200 ℃ tempering , tissue , and precipitation of a large number of ε- carbide to the strength of the steel at this time with the tempering temperature increased , but the toughness slightly . reduced ; tempering at 300 ° C , the precipitation of a large number of cementite organization , the strength of the steel to improve the toughness decreased ; dissolved as the temperature increases , the cementite organization M2C carbides and reverted austenite , strength , The rapid increase in hardness . Impact energy remained stable . When the the tempering temperature reaches 560 ℃ , M2C carbides and reverted austenite coarsening of M23C6 carbide organization , Ferrium S53 mechanical properties of steel fell . Ferrium S53 steel strength improve mainly rely on from the tempering process on the the MDF strips martensitic high dislocation in precipitation of M2C carbide dispersion play a role in the second phase strengthening high purity smelting process and tempering process in horse the reverted austenite 's body between laths precipitated film-like improve the toughness of the steel Ferrium S53 .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Microstructure and properties of steel
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