TZM Alloy Properties Improvement

TZM alloy picture

TZM alloy has high temperature property, but at the high temperature oxidation resistance is poor. At the high temperature TZM alloy can’t produce anti-oxidation layer to protect itself, leading to life service and application range greatly shortened. Improving alloy’s oxidation resistance there are two main methods: alloyage and coating method. Alloyage refers to adding trace elements to improve alloy’s oxidation resistance. And coating method refers to coating a protection layer on alloy surface to improve high temperature oxidation resistance of the alloy. Al powder is usually used in coating material as raw material. And after experiment found the optimum parameters for coating are as following: m (Al2O3): m (Al): m (NH4Cl) = 7: 2: 1,1000 ℃, 12h.

Improving the ductile-brittle transition temperature and mechanical property of the alloy usually use neutron irradiation method. It was found that the alloy after neutron radiation, tensile property significantly improved, although the ductility is decrease, but the hardness is increase. At present, the study of neutron radiation is not mature and the general consensus is obtained through research, which is the radiation will have a lot of small gap in the alloy at a lower temperature, but high temperature radiation the gap will increases and DBTT will decrease.

Alloy after extrusion process will produce a lot of stress. The stress will largely affect the mechanical properties of the alloy. To change the annealing temperature can reduce the stress to improve its machinability. It was found that annealing temperature changes will affect alloy internal organization to cause alloy properties change. Overall, as the annealing temperature increase, the elongation of the alloy is increase and work hardening decrease. On the other hand, improving the production process and quality of raw material is good for TZM alloy properties improvement.

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