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

Abstract

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.