|Title:||Effect of Cr and Al additions on the development of interphase-precipitated carbides strengthened dual-phase Ti-bearing steels||Authors:||Tsai S.-P.
|Keywords:||Dilatometry; Dual-phase steel; Interphase-precipitated nanometer-sized carbide; Isothermal transformations; Transmission electron microscopy; Yield ratio||Issue Date:||2017||Journal Volume:||119||Start page/Pages:||319-325||Source:||Materials and Design||Abstract:||
The development of Ti-Cr-bearing hot-rolled dual-phase steel with an excellent combination of mechanical properties (yield strength of 655 MPa, ultimate tensile strength of 911 MPa, and elongation of 30%) has been achieved. Due to the significant strengthening obtained from interphase-precipitated nanometer-sized carbides in ferrite, this dual-phase steel has yield ratio of about 0.72, which is much higher than that of conventional dual-phase steels. Isothermal transformations on a dilatometer have been performed to investigate the effect of Cr and Al additions on austenite-to-ferrite transformation in Ti-based steels. It was found that an addition of 0.6 wt.% Cr obviously retards the transformation rate of ferrite, as compared with an addition of 0.1 wt.% Al. The results from dilatometry and transmission electron microscopy revealed that due to the lower transformation rate in Ti-Cr-bearing steel, a much higher density of nanometer-sized interphase-precipitated carbides in ferrite occurred during the isothermal holding at 650 °C, leading to a significant increase in the strength of ferrite. © 2017
|DOI:||10.1016/j.matdes.2017.01.071||SDG/Keyword:||Aluminum; Aluminum coated steel; Bearings (machine parts); Carbides; Chromium metallography; Chromium steel; Dilatometers; Ferrite; High resolution transmission electron microscopy; Hot rolled steel; Hot rolling; Isotherms; Tensile strength; Titanium metallography; Transmission electron microscopy; Transmissions; Austenite-to-ferrite transformation; Dilatometry; Isothermal holding; Isothermal transformations; Nanometer-sized carbides; Transformation rates; Ultimate tensile strength; Yield ratios; Dual phase steel|
|Appears in Collections:||材料科學與工程學系|
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