| 摘要 |
<p>Process for treating Ti castings made in a mould where the surface of the casting froms a continuous skin and defects in the form of voids are situated immediately below the skin. The novelty is that just after casting, the piece is heated to 732-1038 degrees C and placed in a gas atmos. and a gas pressure of min. 350kg/cm2 the combined effect of the heat and pressure eliminating the voids by the subsidence and compaction of the casting. Shell moulds are pref. used and removed before applying the heat and pressure or, alternatively, the moulds may remain in place while heat and pressure are applied. Any cores are pref. left in the castins during the process. Hot isostatic pressing to remove voids near the surfaces of the casting(s) in addn. to removing voids on the surface.</p> |
