Method for producing TC4 titanium alloy wide and thick plate by adopting direct rolling process

Abstract

The invention relates to a method for producing a TC4 titanium alloy wide and thick plate by adopting a direct rolling process. The production technological process comprises the steps of EB ingot casting, primary heating, primary rolling, cooling, secondary heating, secondary rolling, annealing and aftertreatment. The steps are specifically as follows: 1) EB ingot casting: an EB furnace is used for smelting, and a TC4 titanium alloy EB slab ingot is obtained; 2) primary heating: after metal layers with the thickness of 3-5 mm on the two faces of the TC4 titanium alloy EB slab ingot are milledaway, the primary heating is conducted in a continuous heating furnace; 3) primary rolling: a blank is rolled back and forth through a wide-width medium-thickness plate rolling mill, and after hot straightening, the blank is cooled to the room temperature; 4) secondary heating; 5) secondary rolling: the blank is rolled back and forth through the wide-width medium-thickness plate rolling mill, andafter hot straightening, the blank is cooled to the room temperature; and 6) annealing. The method has the advantages of short process, low cost, high yield rate, high production efficiency, good surface quality, small differences of plate width and vertical and horizontal mechanical performance, and excellent organization.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal material manufacturing, and in particular relates to a method for producing TC4 titanium alloy wide and thick plates by adopting a direct rolling process. Background technique [0002] TC4 (Ti-6Al-4V) titanium alloy contains 6wt% α-stable element Al and 4wt% β-stable element V, which is a typical α+β-type titanium alloy. It is an 800MPa high-strength titanium alloy with good plasticity, toughness and welding performance. It has broad application prospects in marine engineering, aerospace and other fields. It is currently the most widely used and most used titanium alloy in the world. Variety. In addition, in recent years, the demand for wide-width titanium plates (above 2400mm) is increasing day by day in the development of new energy development, high-end equipment manufacturing and other industries. [0003] The traditional production method of TC4 titanium alloy wide and thick plates is to fi...

AI Technical Summary

Problems solved by technology

[0003] The traditional production method of TC4 titanium alloy wide and thick plates is to first obtain titanium billets through multi-fire forging of VAR round ingots, and then pass through plate rolling mills for multi-fire rolling to obtain finished TC4 titanium alloy wide and thick plates. This process compresses The ratio is large, but the finished product rate is only 55%-65%

However, the TC4 titanium alloy plate directly rolled by the TC4 slab smelted by EB has a yield of more than 75%, but the compression ratio is small. After annealing, the conventional mechanical properties can meet the standard requirements, but its structure is elongated. The lamellar α-phase is distributed on the β-transition matrix; at the same time, there will be more serious edge crack defects when preparing wide-width plates above 2400mm