Is Grade 2 prone to cracking during deep drawing?
Grade 2 titanium is one of the most formable titanium alloys and is not inherently prone to cracking in deep drawing under proper process conditions. However, cracking can still occur if process parameters are not well controlled.
Reasons why Grade 2 is suitable for deep drawing:
It has high ductility and elongation in the annealed condition.
Its low yield strength allows easy deformation without early fracture.
It is widely used in deep-drawn components such as shells, casings, cookware, and hollow parts.
Conditions that may cause cracking during deep drawing:
Excessive work-hardening
Grade 2 work-hardens rapidly during deformation. If the drawing ratio is too high in a single pass, the material hardens too much and cracks.
Insufficient lubrication
Poor lubrication causes high friction between the sheet and die, leading to tearing, galling, or cracking.
Improper die design
Sharp die corners, rough die surface, or incorrect clearance can create stress concentrations and induce cracking.
Material condition
If the material is already cold-worked (not fully annealed), its ductility is lower and cracking becomes much easier.
Excessive drawing ratio
An overly large depth-to-diameter ratio in one step exceeds the material's forming limit.
How to prevent cracking:
Use fully annealed Grade 2 for maximum ductility.
Use high-performance lubricants to reduce friction.
Use smooth, properly radiused dies.
Split deep drawing into multiple passes with intermediate annealing if needed.
Control blank holder force to avoid excessive restriction.
Conclusion
Grade 2 is not prone to cracking in normal deep drawing operations when using annealed material, proper tooling, and reasonable process parameters. Cracking is almost always caused by improper process setup rather than the material itself.
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