Using Powder Metallurgy Method for TZM Alloy Plate Manufacturing

TZM alloy is the most used widely and the best performance molybdenum alloy. TZM alloy has good high temperature strength, creep resistance and higher recrystallization temperature, so it is often made of nozzle, piercing point, mold, heat shields and high-power ceramic tube gates, widely used in industry, military and aerospace fields. TZM alloy production methods are melting and powder metallurgy. Currently most of manufacturers choose to use powder metallurgy method, mainly because it doesn’t need have consumable arc furnace, large presses and high-temperature furnace and other large equipment, and the process is simpler. Besides, using powder metallurgy for TZM alloy plate manufacturing the production cycle is short and energy consumption is low, having high productivity. In addition, the alloy which produced by powder metallurgy has similar properties with smelting method produced alloy. To obtain good system performance alloy plate should improve alloy’s recrystallization temperature and ductility, and reduce plastic-brittle transition temperature, so in the process of rolling should roll in changed directions and process intermediate heat treatment, making the alloy performance has improved. TZM alloy plate produce by powder metallurgy method and the production processes are as following:

TZM image

1. Mixing 0.45% Ti, 0.08% Zr, 0.01% C and graphite powder with Mo for 6 hours is good for full mixing.

2. Using cold isostatic to press the mixed powder at 150MPa pressure obtain pressed blank.

3. Under the protection of hydrogen, the pressed blank is placed in sintering furnace at 2100 ℃ for 4 hours heat preservation and then to sinter to get TZM alloy blank.

4. Roll the 30mm blank at 1350℃, making the slab thickness to become 4.5mm, and the deformation is 83%. Then at 700 ~ 750 ℃, the slab is rolled to 1.2mm, and the total deformation is 95%.

5. Anneal at 900 ℃to eliminate stress, then at 600 ~ 700 ℃ longitudinal rolling to obtain 0.7mm.

6. After annealing at 850 ℃ to eliminate stress, then longitudinal cold rolling at 200 ~ 300 ℃ obtain 0.5mm alloy plate, and the total deformation is 98%.

Email: sales@chinatungsten.com sales@xiamentungsten.com 

Tel.: +86 592 5129696/86 592 5129595

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Powder Metallurgy Produced TZM Alloy Plate Properties Analysis

Modern TZM alloy industrial production usually uses powder metallurgy method. In order to improve the properties of the alloy, should process rolling in changed direction and intermediate heat treatment, which not only can eliminate the stress of the alloy, but also can improve its mechanical properties.

Analyze the mechanical properties and process performance tests on TZM alloy, which produces by powder metallurgy. TZM alloy plate blank cold rolling at 45°orientation has a certain degree tensile property. After annealing at 850 ℃, the plate in all directions at room temperature has tensile strength.

With incomplete pole figure method estimates the orientation distribution function (ODP) of 0.5mm powder metallurgy produced TZM alloy plate in the processing state and eliminate stress state (850 ℃/h) showing that the states of the alloy plate blank will affect alloy plate’ texture And the states and orientation of plate blank’s affected the mechanical properties at room temperature of alloy plate is connected with texture type of plate blank.

TZM ALLOY PICTURE

Alloy state and orientation will great impact curved plastic-brittle transition temperature. When alloy at cold state, the bending performance has better direction. After 850 ℃ annealed, the plastic - brittle transition temperature is decreased, and the lateral amplitude transformation temperature is lowered significantly. After eliminated stress, in all directions of alloy plate transition temperature is similar and below 0 ℃, so the alloy plate is preferably used after stress relief.

After complete recrystallization, there is not elongation on alloy plate. And the curved plastic-brittle transition temperature is increased to above room temperature. So we should avoid use alloy plate above the recrystallization temperature. Alloy plate starting recrystallization temperature is 1200 ℃ and the ending recrystallization temperature is 1600 ℃.

Email: sales@chinatungsten.com sales@xiamentungsten.com 

Tel.: +86 592 5129696/86 592 5129595

Fax: +86 592 5129797

Using Powder Metallurgy Method for TZM Alloy Plate Manufacturing

TZM alloy is the most used widely and the best performance molybdenum alloy. TZM alloy has good high temperature strength, creep resistance and higher recrystallization temperature, so it is often made of nozzle, piercing point, mold, heat shields and high-power ceramic tube gates, widely used in industry, military and aerospace fields. TZM alloy production methods are melting and powder metallurgy. Currently most of manufacturers choose to use powder metallurgy method, mainly because it doesn’t need have consumable arc furnace, large presses and high-temperature furnace and other large equipment, and the process is simpler. Besides, using powder metallurgy for TZM alloy plate manufacturing the production cycle is short and energy consumption is low, having high productivity. In addition, the alloy which produced by powder metallurgy has similar properties with smelting method produced alloy. To obtain good system performance alloy plate should improve alloy’s recrystallization temperature and ductility, and reduce plastic-brittle transition temperature, so in the process of rolling should roll in changed directions and process intermediate heat treatment, making the alloy performance has improved. TZM alloy plate produce by powder metallurgy method and the production processes are as following:

1. Mixing 0.45% Ti, 0.08% Zr, 0.01% C and graphite powder with Mo for 6 hours is good for full mixing.
2. Using cold isostatic to press the mixed powder at 150MPa pressure obtain pressed blank.
3. Under the protection of hydrogen, the pressed blank is placed in sintering furnace at 2100 ℃ for 4 hours heat preservation and then to sinter to get TZM alloy blank.
4. Roll the 30mm blank at 1350℃, making the slab thickness to become 4.5mm, and the deformation is 83%. Then at 700 ~ 750 ℃, the slab is rolled to 1.2mm, and the total deformation is 95%.
5. Anneal at 900 ℃to eliminate stress, then at 600 ~ 700 ℃ longitudinal rolling to obtain 0.7mm.
6. After annealing at 850 ℃ to eliminate stress, then longitudinal cold rolling at 200 ~ 300 ℃ obtain 0.5mm alloy plate, and the total deformation is 98%.

Powder Metallurgy Produced TZM Alloy Plate Properties Analysis

Modern TZM alloy industrial production usually uses powder metallurgy method. In order to improve the properties of the alloy, should process rolling in changed direction and intermediate heat treatment, which not only can eliminate the stress of the alloy, but also can improve its mechanical properties.

Analyze the mechanical properties and process performance tests on TZM alloy, which produces by powder metallurgy. TZM alloy plate blank cold rolling at 45°orientation has a certain degree tensile property. After annealing at 850 ℃, the plate in all directions at room temperature has tensile strength.

With incomplete pole figure method estimates the orientation distribution function (ODP) of 0.5mm powder metallurgy produced TZM alloy plate in the processing state and eliminate stress state (850 ℃/h) showing that the states of the alloy plate blank will affect alloy plate’ texture And the states and orientation of plate blank’s affected the mechanical properties at room temperature of alloy plate is connected with texture type of plate blank.

Alloy state and orientation will great impact curved plastic-brittle transition temperature. When alloy at cold state, the bending performance has better direction. After 850 ℃ annealed, the plastic - brittle transition temperature is decreased, and the lateral amplitude transformation temperature is lowered significantly. After eliminated stress, in all directions of alloy plate transition temperature is similar and below 0 ℃, so the alloy plate is preferably used after stress relief.

After complete recrystallization, there is not elongation on alloy plate. And the curved plastic-brittle transition temperature is increased to above room temperature. So we should avoid use alloy plate above the recrystallization temperature. Alloy plate starting recrystallization temperature is 1200 ℃ and the ending recrystallization temperature is 1600 ℃.