Abstract
In order to clarify the influence of vibration applied during solidification and the effect of mold wallconditions on ingots, rolled steel and weld zone, some experiments were conducted on steel specimens(SM41, SM50, and Fe-3.5%Ni). The following items were revealed through these experiments:
(1) Content of equi-axial crystalline grains increase and their grainsize arerefined by vibration(horizontal circular vibration, 0.3 mmp-p, 60 Hz).
(2) These effects are enhanced when the mold wall is replaced by silicon nitride.
(3) The change in crystalline structures caused by application of vibration disappears when the ingots are rolled. (4) Steel sheets rolled from the ingots solidified under application of vibration are inferior intoughness. (5) Application of vibration during solidification has no effect on the properties of the heat affected zone of welded areas (6) In most cases, vibration during welding does not affect the properties ofthe welded metal.
