Study on Hot Deformation Behavior of Recrystallized TZM Alloy
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- Category: Molybdenum knowledge
- Published on 26 September 2014
- Written by jwy
- Hits: 655
TZM (Ti-Zr-Mo) alloy is one of commonly used high temperature alloys in molybdenum alloy, which contains 0.50% titanium, 0.08% zirconium, and 0.02% carbon. TZM alloy has the features of high melting point, high strength, elastic modulus, small linear expansion coefficient, low steam, good conductive thermal conductivity, strong resistance to corrosion and good high temperature mechanical performance. All these advantages make TZM alloy widely used in many fields. Besides, TZM alloys have good mechanical properties, especially its mechanical properties at high temperature is better than pure molybdenum.
Hot deformation behavior of recrystallized TZM (Mo-0.39Ti-0.093Zr-0.017C) alloy was studied on Gleebe-3500 simulator. The samples were prepared by powder metallurgical techniques with 70% forging deformation and then annealed at 1100, 1200, 1300, 1400, 1500 and 1600 ℃ respectively. The recrystallization process of TZM alloy was observed. The hot compression simulation was carried out at 1200 ℃ with 0.1 s-1 strain rate and 30% deformation, then the true stress-strain curves of hot compression of TZM alloy were obtained.
The experimental results showed that hardness of TZM alloy decreased with temperature rose and the decreased rate was 0.13(HV/℃). After annealed at 1600 ℃, the grains fully grew up. At present, recrystallization was complete, and the TZM alloys softened apparently. As full recrystallized TZM alloy was hot deformed at 1200 ℃, the stress increased greatly with the strain increased when the strain was below 5%, and work hardening was notable. The stress increased slowly with strain increased when strain was above 5%, and work hardening rate decreased.
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