Investigation of the microstructure evolution and mechanical properties of a TC6 alloy blade preform produced by cross w
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(2020) 20:70
ORIGINAL ARTICLE
Investigation of the microstructure evolution and mechanical properties of a TC6 alloy blade preform produced by cross wedge rolling Junling Li1 · Baoyu Wang1 · Shuang Fang2 · Ping Chen1 Received: 21 January 2020 / Revised: 14 May 2020 / Accepted: 28 May 2020 © Wroclaw University of Science and Technology 2020
Abstract Cross wedge rolling (CWR) is one of the most effective plastic deformation methods utilized for the production of shaft parts or non-shaft preforms with refined grains and improved mechanical properties. The main goal of this work was to study the influence of CWR process parameters on the microstructure evolution and mechanical properties of a TC6 alloy and determine the suitable process parameters for a TC6 alloy blade preform fabricated with CWR. The results showed that the volume fraction of the equiaxed α phase ( f𝛼_e ) decreased from ~ 0.38 to ~ 0.04 by increasing the initial deformation temperature, and the elongation (El) also decreased from ~ 19.6 to ~ 11.8% because dislocation slip first started in the equiaxed grains and then dispersed into the adjacent grains. Thus, additional equiaxed grains contributed to an increased plasticity. Moreover, with an increasing area reduction, the value of f𝛼_e increased from ~ 0.14 to ~ 0.31, and the grain refinement and microstructure uniformity also increased. In addition, the El was significantly reduced by over 50%, but the ultimate tensile strength (UTS) and yield strength (YS) increased under WC (water cooling) conditions due to the precipitation of the acicular secondary α phase and pinning effect of the small equiaxed α phase. Based on the determined suitable parameters, the TC6 alloy blade preform was successfully manufactured by CWR, the microstructure was evenly distributed, and the UTS, YS and El were 1120.1 MPa, 1020.9 MPa and 15.2%, respectively, which meet the current technical requirements. Keywords TC6 titanium alloy · Cross wedge rolling · Microstructure evolution · Mechanical properties · Blade preform
1 Introduction Titanium and titanium alloys are highly valued and widely used in the aerospace, petroleum and chemical industries due to their excellent specific strength, high operating temperature and corrosion resistance. TC6 is a two-phase titanium alloy that can withstand a working temperature up to 450 °C. Therefore, it is preferentially used in the production of compressor discs, drums and other parts, especially blades in aero-engines [1]. To achieve better mechanical properties, high-temperature plastic deformation processes * Junling Li [email protected] 1
School of Mechanical Engineering, University of Science and Technology Beijing, No.30 Xueyuan Road, Haidian District, Beijing 100083, China
Beijing Institute of Aeronautical Materials, Beijing 100095, China
2
are commonly used to manufacture aero-engine blades, such as forging [2–4]. Multiple steps are sequentially required and collaborated in the production of the blades, and heading/ extrusion or free forging are used for prel
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