Influence of thermomechanical treatment on the properties of 36NKhT Yu, 36NKhT YuM8, and 42NKhT Yu spring alloys

Conclusions

• 1. The dynamic elastic modulus of the alloys investigated subjected to thermomechanical treatment depends very little on the degree of preliminary plastic deformation.

• 2. The hardness, the yield strength, and particularly the elastic limit of the alloys after quenching, deformation, and tempering increase with increasing degrees of preliminary plastic deformation.

• 3. The ultimate strength of the 36NKhT Yu alloy remains almost unchanged, while that of the 42NKhT Yu and 36NKhT YuM8 alloys increases with increasing degrees of preliminary plastic deformation.

• 4. The relative elongation of the alloys after quenching, deformation, and tempering decreases with increasing degrees of preliminary plastic deformation.

• 5. Thermomechanical treatment consisting of quenching, cold plastic deformation, and tempering is a promising process for improving the properties of spring alloys, particularly in the case of articles which do not require a high degree of plasticity during manufacturing.