Titanium Shot Peening Strengthening
Titanium shot peening creates compressive residual stresses in the surface layer of titanium components by bombarding with shots, which increases fatigue life under cyclic loading.
Physical-Chemical Operating Principle
Titanium shot peening uses the principle of plastic deformation. Shots are propelled at high velocity onto the surface of titanium components, generating localized compressive residual stresses and plastically deforming the surface layer. This deformation leads to increased strength and fatigue life.
Metallurgical Relevance & Risks in Welding
The peening increases the hardness and stress level in the surface layer, enabling higher toughness under cyclic loading. However, excessively high stress levels can lead to grain coarsening, which may impair weld quality. It is important to precisely control the peening parameters.
Shop Practice & Action Guidelines
Use a shot peening machine with correct settings for titanium components. The shot velocity should be between 200 and 300 m/s, and the travel speed should be set at about 100 mm/s. Ensure that the components are clean and free of dirt particles before peening, as they can lead to uneven work hardening.