We prepared Ti-6Al-7Nb alloy by investment centrifugal casting. The elongation we obtained is relatively low but yield strength and ultimate tensile strength are high enough as desired.
Several ways we have done to improve/optimize mechanical properties especially elongation such as heat treatment process, gating system design, process parameter adjustment etc. However, elongation is still low, below 8%. How to improve elongation for minimum 8%? Is it possible for investment centrifugal casting method?
Thank you very much.
Dear Idham Damisih,
To improve the elongation it is necessary to grind the structure. By centrifugal casting a fine surface structure can be achieved. In depth, the structural grains grow together due to the cooling rate.
If the cooling rate can be increased, the structure will also improve. Then it is necessary to carry out ternic processes to reduce internal stresses. Doug approach to improving and crushing the structure is by plastic hot deformation (rolling, stamping or pressing).
I wish you success!
Emil Yankov
As I know, the tempering process can increase the elongation and the toughness of steels. Zou et al.(the article reported below) adopted the inter-critical annealing-tempering process to balance the strength-ductility-toughness of a precipitation-strengthened low-carbon medium-Mn steel. I suggest you use the tempering method with different conditions. Good luck
Article Improved strength-ductility-toughness balance of a precipita...
Anukwonke Maxwell Chukwuma Attached please find the microstructure analysis using optical microscope (2750X magnification). Thank you.
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