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Chinese Journal of Materials Research  2016, Vol. 30 Issue (1): 23-30    DOI: 10.11901/1005.3093.2015.284
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Mechanical Property of Powder Compact and Forming of Large Thin-Wall Cylindrical Structure of Ti55 Alloys
XU Lei1,*(), GUO Ruipeng1,2, CHEN Zhiyong1, JIA Qing1, WANG Qingjiang1
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
Cite this article: 

XU Lei, GUO Ruipeng, CHEN Zhiyong, JIA Qing, WANG Qingjiang. Mechanical Property of Powder Compact and Forming of Large Thin-Wall Cylindrical Structure of Ti55 Alloys. Chinese Journal of Materials Research, 2016, 30(1): 23-30.

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Abstract  

Pre-alloyed powders of T55 have been hot-isostatic-pressed (HIPed) at different HIPing temperatures, and the powder compacts were solution- and aging- treated. Thereafter the powder compacts were carefully examined to establish the relationship between their microstructure and mechanical property. Powder compacts HIPed at 940℃ and 970℃ showed no significant difference on the microstructure and tensile properties. Due to the densification wave effect caused by a non-uniformity of temperature/pressure field during HIPing, the recommended HIPing temperature is 940℃ in this work. The tensile property of powder compact at 600℃ was improved obviously after solution- and aging- treatment. The tensile property of the heat-treated powder compact is close to that of the wrought alloy but better than those of the cast ones. Finite element analysis was used to predict the final dimensions of the small casing component after HIPing, which is well consonant with the experimental data, thus, the FEM analysis is an efficient method for the design and manufacture of powder components. Based on the optimal container design and FEM analysis, a large thin-wall cylindrical structure of Ti55 alloys was manufactured successfully.
Key words:  metallic materials      powder metallurgy      hot isostatic pressing      Ti55 alloy      large thin-wall cylindrical structure      finite element analysis     
Received:  12 May 2015     
About author:  *To whom correspondence should be addressed, Tel: (024)83978843, E-mail: lxu@imr.ac.cn.
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Lei XU
Ruipeng GUO
Zhiyong CHEN
Qing JIA
Qingjiang WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.284     OR     https://www.cjmr.org/EN/Y2016/V30/I1/23

Al Sn Zr Mo Nb Ta Si O N H Ti
5.41 3.46 2.91 0.68 0.36 0.42 0.28 0.09 0.0036 0.003 Bal.
Table 1  Chemical composition and gas contents of Ti55 pre-alloyed powder (%, mass fraction)
Fig.1  XRD spectra (a) and particle size distribution (b) of Ti55 pre-alloyed powder (size fraction, %)
Fig.2  SEM image of Ti55 pre-alloyed powder surface
Fig.3  Microstructure of Ti55 powder compacts HIPed at (a) 940℃/140 MPa/3 h, (b) 970℃/140 MPa/3 h
HIPing
temperature		 20oC 550oC
UTS/MPa YS/MPa El./ % R.A./% UTS/MPa YS/MPa El./% R.A./%
940 oC 974 921 16.0 28.4 624 499 14.4 22.9
970 oC 1002 941 11.5 18.6 641 515 13.2 19.1
Table 2  Tensile properties of Ti55 powder compacts HIPed at 940℃ and 970℃
Fig.4  Comparison of cylinder capsules before and after HIPing
Fig.5  Microstructure of heat-treated Ti55 powder compacts, (a) 960℃/1.5 h/AC+600℃/4 h/AC, (b) 990℃/1.5 h/AC+600℃/4 h/AC
State t / oC UTS / MPa YS / MPa El. / % R.A. / %
As-HIPed 20 974 921 16.0 28.4
600 586 465 15.8 22.9
960oC/1.5 h/AC+600oC/4 h/AC 20 994 902 14.8 39.0
600 655 510 20.8 34.5
990oC/1.5 h/AC+600oC/4 h/AC 20 1005 902 14.3 30.3
600 650 509 22.5 37.2
Table 3  Tensile properties of PM Ti55 alloy from different heat treatment routes
Fig.6  Microstructure of Ti55 alloys, (a) as-cast, (b) (α+β) forged
Fig.7  Comparison of tensile properties of heat-treated casting, PM and wrought Ti55 alloys, (a) at 20℃,(b) at 600℃
Fig.8  (a) CAD drawing of the container design and (b) picture of HIPed small demo part (unit: mm)
Fig.9  Cross-section of PM titanium alloy thin-wall cylinder structure
Position FEM size
/mm		 Actual size
/mm		 Deviation
/mm		 Relative error
/%
I 9.34 9.55 0.21 2.2
II 3.86 3.92 0.06 <1
III 3.67 4.09 0.42 1.05
IV 14.53 14.17 0.36 2.64
V 3.62 4.16 0.54 1.35
VI 4.13 4.05 0.08 <1
Table 4  Dimension analysis of PM titanium alloy thin wall cylinder structure
Fig.10  Large thin-wall cylindrical structure of Ti55 alloys
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