Thermomechanical processing of a high strength metastable beta titanium alloy powder, consolidated using the low-cost FAST-forge process

被引:28
作者
Calvert, Emma [1 ]
Wynne, Brad [1 ,2 ]
Weston, Nick [1 ]
Tudball, Adam [3 ]
Jackson, Martin [1 ]
机构
[1] Univ Sheffield, Dept Mat Sci & Engn, Sir Robert Hadfield Bldg,Mappin St, Sheffield S1 3JD, S Yorkshire, England
[2] Adv Forming Res Ctr, 85 Inchinnan Dr, Inchinnan PA4 9LJ, Renfrewshire, England
[3] Kennamet Mfg Ltd, Lake Rd,Leeway Ind Estate, Newport NP19 4SR, Shrops, England
基金
英国工程与自然科学研究理事会;
关键词
Field-assisted sintering technology (FAST); Ti-5553; Spark plasma sintering (SPS); Forging; TI-5AL-5MO-5V-3CR;
D O I
10.1016/j.jmatprotec.2017.11.035
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The high strength titanium alloy Ti-5553 has been fully consolidated and thermomechanically processed from powder using the FAST-forge process, in only three steps, both at the small and the pilot scale. Titanium alloy components are conventionally produced using a time-consuming process, which involves carbo-chlorination extraction of TiO2, triple vacuum arc re-melting, and multiple thermomechanical and heat treatment steps, before machining. The proposed FAST-forge processing route for titanium alloy components cuts out or significantly reduces these stages, and uses field-assisted sintering technology (FAST) to consolidate powder. This paper assesses the effectiveness of the process for a conventionally used high-strength beta titanium alloy, Ti-5553. Ti-5553 has been fully consolidated by the FAST process at two different dwell temperatures, 850 and 1000 degrees C, and for a 30 min dwell time. Small-scale upset forging of cylinders machined from each FAST condition has been performed at forging temperatures 785, 810 and 835 degrees C, and strain rates 0.01, 0.1, 1 and 5 s(-1), in order to examine the flow stress behaviour. The flow behaviour of both FAST-produced Ti-5553 specimens was found to be very similar to conventionally produced Ti-5553, and the forged microstructures were also comparable. Large-scale forging has been performed on three double truncated cones machined from a FAST specimen produced at a temperature of 1000 degrees C with a 30 min dwell time. The cones were forged at 785, 810 and 835 degrees C, and at a strain rate of approximately 3 s(-1). Each forged specimen was heat treated for 4 h at a proprietary temperature between 750 and 850 degrees C, and aged for 8 h at a proprietary temperature below 650 degrees C in an inert atmosphere, before air cooling to room temperature. The forged microstructures and heat treated microstructures were found to be comparable to that of conventionally produced Ti-5553. Microhardness measurements of the heat treated specimens, with averages of between 410 and 417 Hv, were higher than that of conventionally produced Ti-5553, and were very consistent despite variations in strain and forging temperature. Successful scale-up of the process for a metastable beta titanium alloy indicates its potential to be utilised at an industrial scale.
引用
收藏
页码:158 / 170
页数:13
相关论文
共 35 条
[1]   Synthesis of porous titanium implants by environmental-electro-discharge-sintering process [J].
An, YB ;
Lee, WH .
MATERIALS CHEMISTRY AND PHYSICS, 2006, 95 (2-3) :242-247
[2]  
[Anonymous], 2015, BOEING MAKES PLANES
[3]   The use of β titanium alloys in the aerospace industry [J].
Boyer, RR ;
Briggs, RD .
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2005, 14 (06) :681-685
[4]  
Cahn RW, 2007, PERGAMON MATER SER, V11, P57
[5]  
Calvert Emma, 2016, Key Engineering Materials, V716, P800, DOI 10.4028/www.scientific.net/KEM.716.800
[6]   Development of α-phase morphologies during low temperature isothermal heat treatment of a Ti-5Al-5Mo-5V-3Cr alloy [J].
Dehghan-Manshadi, Ali ;
Dippenaar, Rian J. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2011, 528 (03) :1833-1839
[7]   Corrosion and in vitro biocompatibility properties of cryomilled-spark plasma sintered commercially pure titanium [J].
Dheda, Shehreen S. ;
Kim, Yoon Kyung ;
Melnyk, Christopher ;
Liu, Wendy ;
Mohamed, Farghalli A. .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 2013, 24 (05) :1239-1249
[8]  
Dieter Jr G.E., 1961, MECH METALLURGY, P81
[9]  
FLOWER HM, 1990, MATER SCI TECH SER, V6, P1082, DOI 10.1179/026708390790189984
[10]  
Fluhrer J., 2004, DEFORM 2D VERSION 8