Abstract
By means of consumable double melting method we produced a titanium ingot containing about 2% each of iron and aluminium, whose structure is uniform and sound. As to mechanical properties, its tensile strength and elongation are about 90 kg/mm2 and 20% at room temperature, respectively, and consequently this product shows a satisfactory result as high tensile alloy. Its tensile strength and elongation at 600° rise to 30 kg/mm2 and 30%,respectively, and at moderate temperature it shows excellent heat resistance.
As to workability, it is easily subjected to hot forging and rolling. Furthermore, even in the case of 50% reduction by cold rolling it can obtain the tensile strength of 130 kg/mm2, and in the case of reduction up to 80% by cold drawing the tensile strength becomes 150 kg/mm2. With regard to heat treatment property, it shows a structure of α+β at room temperature, and in the case of water quenching from the temperature of 1,000° it shows the structure of α′. As a result of isothermal transformation test at the temperature ranging from 400° to 950°, α structure appears in the quanching structure, while in quench aging test an unknown precipitation appears in the structure at the temperature of about 500°.
