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Chinese Journal of Materials Research  2017, Vol. 31 Issue (6): 409-414    DOI: 10.11901/1005.3093.2016.267
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Effect of Heat Treatment on Mechanical Properties of Ti-3Al-8V-6Cr-4Mo-4Zr Alloy
Xuemeng WANG,Siqian ZHANG(),Ziyao YUAN,Lijia CHEN
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
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Xuemeng WANG,Siqian ZHANG,Ziyao YUAN,Lijia CHEN. Effect of Heat Treatment on Mechanical Properties of Ti-3Al-8V-6Cr-4Mo-4Zr Alloy. Chinese Journal of Materials Research, 2017, 31(6): 409-414.

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Abstract  

The effects of solution treatment and aging treatment on microstructures and mechanical properties of Ti-3Al-8V-6Cr-4Mo-4Zr alloy bars have been investigated. The results show that the highest hardness and the highest tensile strength can be achieved by the solution and aging treatment (800℃×30 min/AC+510℃×16 h/AC), and an insignificant decline on elongation rate and necking rate is also acquired. The quantity and size of the ω-phases and α-phases result in the increase of hardness and strength of Ti-3Al-8V-6Cr-4Mo-4Zr alloy bars. A lot of dimples exist in the tensile fractures of the hot rolling alloys and heat treatment alloysdemonstrating a typical ductile fracture.
Key words:  metal materials      solution and aging treatment      tensile properties      tensile fracture     
Received:  18 May 2016     
Fund: Supported by National Natural Science Foundation of China (Nos.51101160 & 51501117), Liaoning Provincial Department of Enducation Project (No.L2014050)
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Xuemeng WANG
Siqian ZHANG
Ziyao YUAN
Lijia CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.267     OR     https://www.cjmr.org/EN/Y2017/V31/I6/409

Fig.1  Age-hardening response of Ti-3Al-8V-6Cr-4Mo-4Zr alloy in 350~550℃
Fig.2  SEM images of Ti-3Al-8V-6Cr-4Mo-4Zr alloy in different heat treatmentconditions (a) origin (b) 800℃/30 min (c) 800℃/30 min +500℃/4 h (d) 800℃/30 min +500℃/12 h
σb/MPa σ0.2/MPa φ ψ
Hot rolling 1008.9 1002.4 21.96% 39.22%
800℃/30 min 958.0 954.2 16.33% 31.23%
800℃/30min +500℃/4 h 1205.2 1137.8 12.98% 16.94%
800℃/30min +500℃/12 h 1452.1 1436.9 12.75% 15.85%
800℃/30min +500℃/24 h 1440.2 1429.3 11.95% 14.87%
Table 1  Tensile properties of Ti-3Al-8V-6Cr-4Mo-4Zr alloy after heat treatments
Fig.3  SEM images of tensile fracture in different heat treatment conditions (a) origin, (b) 800℃/30 min, (c) 800℃/30 min+500℃/4 h, (d) 800℃/30 min+500℃/12 h
Fig.4  TEM images of microstructure in different heat treatment conditions (a), (b) 800℃/30 min+500℃/8 h; (c), (d) 800℃/30 min+500℃/12 h;(e), (f) 800℃/30 min+500℃/24 h
Fig.5  TEM images of dislocation in the heat treatment conditions 800℃/30 min+500℃/12 h after tensile deformation
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