Abstract
In a cold-rolled and aged 17-7 PH spring steel, the relations between the anisotropies of mechanical and magnetic properties and textures have been investigated.
The rolling textures of martensite in 17-7 PH steel consist chiefly of two principal components, {211}‹011› and {100}‹011›, which are similar to those in mild steel. After aging the cold-rolled 17-7 PH steel, new component is not found in martensite, but a new component near {113}‹211› appears in austenite transformed reversely from martensite.
After aging the cold-rolled 17-7 PH steel at around 500°C, the highest values of tensile strength and Young's modulus are obtained in the transverse direction to the rolling direction of sheet, and the highest residual induction is observed in the rolling direction.
The magnetic torque curves of cold-rolled 17-7 PH sheet show the cubic anisotropy. However, uniaxial anisotropy increases rapidly by subsequent aging at around 650°C and the easy direction of magnetization is parallel to rolling direction.
It may be concluded that the good spring material with ferromagnetism is obtained, when the iron-base alloys having semi-hard magnetic property and high Young's modulus are cold-rolled, cut parallel to the rolling direction and aged in the temperature range when the residual induction is increased and at the same time the coercive force is decreased.
