The four laws of plastic deformation of titanium alloy forgings

June 26, 2023

　Titanium forgings follow the following basic laws in plastic deformation:

　　1, the law of tangential stress

　　Forging under the action of external forces, only when its internal shear stress reaches a critical value, it is possible to produce plastic deformation. The size of the critical shear stress depends on the type of forging (composition, organization) and deformation conditions (deformation temperature, degree of deformation, etc.) so the law of shear stress is related to plastic deformation is a very important basic law.

　　2, the law of volume invariance

　　Forging in plastic deformation to keep the volume unchanged. However, in the actual forging production, ingots and other billets within the loose and cracked by forging after compaction, forging blanks density increases, the volume decreased slightly; and in the cold deformation of the forging becomes looser, the volume increased slightly; but these small changes can be ignored. Thus, the law of volume invariance is one of the important basis for calculating the size of the forging blank, process size and design of the mold.

　　3, the law of small resistance

　　When the Titanium Alloy Forgings produce plastic deformation, each internal mass is always moving along the direction of small resistance, this law is called the law of small resistance. According to the law of small resistance, in the forging production of many complex situations to determine the flow direction of the metal deformation of each point of mass, so as to control the deformation of the forging billet flow paths, in order to facilitate the Titanium Alloy forging billet forging molding, and to achieve a reduction in energy consumption, improve productivity.

　　4, the law of elastic deformation

　　Titanium metal in plastic deformation accompanied by elastic deformation. Moreover, the metal in the elastic limit of plastic deformation outside the elastic deformation still exists. In order to be able to occur plastic deformation, the shear stress must reach a certain value.

　　Metal under the action of external forces, the size of the deformation and cancel the size of the external force is not equal. So the size of the forging is not exactly the same as the size of the mold bore. However, the rebound phenomenon of metal in thermal deformation is negligible due to good plasticity and small elastic deformation.

Author:

Mr. Shen

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shenguanlun9696@gmail.com

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