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Chinese Journal of Materials Research  2017, Vol. 31 Issue (5): 352-358    DOI: 10.11901/1005.3093.2016.621
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Effect of Heat Treatment Process on Microstructure and Mechanical Properties of Titanium Alloy Ti6246
Guoqiang WANG1,2, Zibo ZHAO2(), Bingbing YU2, Zhiyong CHEN2, Qingjiang WANG2, Rui YANG2
1 School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Guoqiang WANG, Zibo ZHAO, Bingbing YU, Zhiyong CHEN, Qingjiang WANG, Rui YANG. Effect of Heat Treatment Process on Microstructure and Mechanical Properties of Titanium Alloy Ti6246. Chinese Journal of Materials Research, 2017, 31(5): 352-358.

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Abstract  

The influence of heat treatment temperature and cooling rate on the microstructure, phase and tensile deformation behavior of Ti-alloy Ti6246 alloy was investigated. The results show that the α′′ martensite was observed in prior β phase after solution heat treatment followed by water quenching. While a fine transformed β microstructure produced as a result of air cooling. For the air cooling alloy, both the size and volume fraction of the secondary α grain increased with the increasing solution heat temperature in air cooling samples. A “double yield” phenomenon appeared in the engineering stress-strain curves of the water quenching alloy samples. After aging treatment, the strength of water- and air-cooled alloys samples increased but the plasticity decreased. An optimal property in strength and ductility was achieved for the alloysamples after soluted solution treated at 900-920°C and then aged at 595°C.
Key words:  metallic materials      Ti6246 alloy      heat treatment      cooling rate      α′′ martensite      tensile properties     
Received:  24 October 2016     
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Guoqiang WANG
Zibo ZHAO
Bingbing YU
Zhiyong CHEN
Qingjiang WANG
Rui YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.621     OR     https://www.cjmr.org/EN/Y2017/V31/I5/352

Al Sn Zr Mo Si Fe H O N Ti
6.05 1.99 3.95 5.79 <0.01 0.015 0.0006 0.063 0.0020 Bal.
Table 1  Elemental compositions of the Ti6246 alloy (mass fraction, %)
Fig.1  Microstructure of as-received Ti6246 alloy
Fig.2  Microstructure of Ti6246 alloy after different heat treatment (a) 900℃/1 h/WQ, (b) 900℃/1 h/AC, (c) 900℃/1 h/WQ+595℃/8 h/AC, (d) 900℃/1 h/AC +595℃/8 h/AC
Fig.3  Microstructure of Ti6246 alloy after different heat treatment (a) 920℃/1 h/WQ, (b) 920℃/1 h/AC, (c) 920℃/1 h/WQ+595℃/8 h/AC, (d) 920℃/1 h/AC+595℃/8 h/AC
Fig.4  Microstructure of Ti6246 alloy after different heat treatment (a) 950℃/1 h/WQ, (b) 950℃/1 h/AC, (c) 950℃/1 h/WQ+595℃/8 h/AC, (d) 950℃/1 h/AC +595℃/8 h/AC
Fig.5  XRD patterns of Ti6246 after heat treatment at 920℃
Fig.6  XRD patterns of Ti6246 after water quenching
Fig.7  Engineering stress-strain curves of Ti6246 alloy at different heat treatment (a) 900℃, (b) 920℃, (c) 950℃
Solution
temperature		 Cooling
mode		 Rp0.2
/MPa		 Rm
/MPa		 A
/%		 Z
/%
900℃ WQ 297 1106.5 16.25 43.5
AC 990 1232 14.25 43
WQ+AG 1383 1475 6.25 14.5
AC+AG 1292 1377.5 9.5 30
920℃ WQ 382.5 1099 10.5 16.5
AC 1136 1370.5 9.25 34
WQ+AG 1447.5 1497.5 0.5 1
AC+AG 1288 1390.5 8.5 23.5
950℃ WQ 444.5 1046.5 6.25 7
AC 1211 1368.5 0.5 1.5
WQ+AG - 1252 -- --
AC+AG - 1302 -- --
Table 2  Room temperature tensile properties of Ti6246 alloy after heat treatment
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