Study on Microstructure and Mechanical Properties of Newly Developed High Carbon Fe-Mn-Cu-C TWIP Steels

Abstract:

The effects of high carbon content on the microstructure and tensile properties of Fe-20Mn-3Cu-xC TWIP steels were studied by OM, XRD, SEM analysis. The experimental results indicate that the amount of carbide and micro-porosity increased with the increasing of carbon content. The microstructures in the undeformed and deformed region of Fe-20Mn-3Cu-xC steels exhibit fully austenitic phase. The fractography of tensile samples reveals typical tough fracture microstructure with isometric dimples. The number of carbide in the as-cast structure, the yield strength and the tensile strength increase with the increasing of carbon addition, but the elongation rate increases at first and then decreases. TWIP steel has the optimum property when the carbon addition is 1.3 mass pct, of which the tensile strength is 1040.59 MPa, the elongation percentage is 98.08% and the strength-elongation product achieves 102061.07MPa•%. Fe-20Mn-3Cu-xC steels have high strain hardening capacity, and strain hardening rate (θ) and strain hardening index (n) both increase with the increasing of C addition.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 233-239
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.233
• Online since: November 2011
• Authors: Wei Tao Song, Ding Yi Zhu, Hai Jun Liu, Fen Fen Huang
• Keywords: Carbon Content, Mechanical Property, Strain Hardening Index, Strain Hardening Rate, TWIP Steel

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