Effect of different thermomechanical processing on structure and mechanical properties of electron beam melted niobium |
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Authors: | M Sankar Y Satish Reddy R G Baligidad |
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Affiliation: | (1) Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India |
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Abstract: | Among the refractory metals and alloys, niobium and niobium alloys are used in variety of high temperature applications ranging
from light bulbs to rocket engines because of its high melting and boiling point, lower density, good ductility at room temperature
and high corrosion resistance. In this paper the effects of different thermomechanical processing on structure and mechanical
properties of electron beam melted niobium ingot was investigated. The correlation among the different processing conditions
and microstructure as well as mechanical properties have been investigated using optical microscope, SEM, UTM and microhardness
testing. The results show that the cold forging response of EB melted ingot was very poor, where as oxidation resistant coated
ingot and ingot sealed in evacuated stainless steel jacket were successfully forged at 900 °C. The cast and hot forged EBM
niobium ingot was cold rolled without any intermediate annealing. The hot forged, cold rolled and annealed niobium sheets
exhibit better strength as compared to cold rolled and annealed niobium sheets. The mechanical properties of all the niobium
sheets processed by using different processing conditions are superior to the properties specified by ASTM standard. |
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Keywords: | niobium electron beam melting thermomechanical processing cold forging annealing |
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