DESC:PRIORITY STATEMENT
The present application hereby claims priority from Indian patent application with the application number 202341024812, filed on 31 March 2023, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD OF INVENTION
The present invention relates to a layered hot pack rolling technique. More particularly, the present invention discloses novel method for hot rolling of packed Ti6Al4V alloy for producing thin sheets.

BACKGROUND OF INVENTION
Generally, in non-ferrous metals such as alloy Ti and high alloy steels, there are many so-called difficult-to-work materials such as insufficient rolling during cold and high deformation resistance, and it is often very difficult to manufacture thin sheets by cold rolling due to problems such as cracking, milling capacity and rolling efficiency.
Also, when hot rolling these metals, we want to keep the hot rolling temperature within a certain range in order to adjust the structure of the product, to eliminate the rolling anisotropy seen in alloy Ti . Although there are demands for cross rolling and the like, ordinary tandem strip mills often cannot satisfy this demand. Therefore, it is difficult to produce thin plates even in hot rolling.
At present, no published literature could be cited disclosing production of cold rolled sheet of Titan 31. Further, no literature discloses manufacturing of Ti-6Al-4V 1.5 mm sheet using cold roll milling.
Based on the practical experience, the sheet gets defected, and cracking occurs when cold rolling is done below 3 mm.
Therefore, in order to overcome the practical challenges posed while manufacturing 1.5 mm sheet without any defects, the present invention discloses Hot Pack Rolling technique

OBJECT OF THE INVENTION
The principal object of the present invention is to overcome the technical problems mentioned in the background art and aims to provide thin sheets of Ti-6Al-4V using hot pack rolling technique.

SUMMARY OF THE INVENTION
This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the disclosure. This summary is neither intended to identify key or essential inventive concepts of the disclosure nor is it intended for determining the scope of the disclosure.

A method of manufacturing 1.5 mm Ti6Al4V hot-rolled sheets, the method comprising the steps of heating 5mm thick Ti6Al4V alloy plates to 950 degrees Celsius; preparing the surface of the heated plates by pickling, polishing, and trimming the edges; preparing a pack by aligning and stacking three Ti6Al4V alloy plates, and welding the pack from all sides to prevent dislocation of each substrate during the rolling process; making cuts at the corners of the pack to maintain gaps for the passage of gases; heating the pack in a heating furnace; hot rolling the pack along the length direction to reduce it to 1.5mm sheets; and subjecting the rolled sheets to annealing and post-treatment.

DESCRIPTION OF THE INVENTION
Titan 31 or Ti-6Al-4V or Ti-64 is an alpha-beta titanium alloy composed of 6% aluminum, 4% vanadium and balance by weight. It is one of the most commonly used titanium alloys, and it has a high strength-to-weight ratio, good corrosion resistance, and excellent biocompatibility. It is also sometimes referred to as Grade 5 titanium.
In accordance with an embodiment, the present invention relates to a method for producing Ti-6Al-4V hot rolled sheet of a titanium alloy comprising two phases of an alpha phase and a beta phase. The two phase titanium alloy composed of the alpha (a) phase and the beta (b) phase is lightweight and has excellent strength.
Accordingly, the present invention discloses a two-phase titanium alloy hot rolled plate, and more particularly, a method for manufacturing a two-phase titanium alloy hot-pack rolled plate having low anisotropy in mechanical properties by controlling the temperature.
In accordance with an embodiment, the present invention can be realized by the following technical scheme wherein Ti6Al4V alloy sheet hot rolling process comprises the following steps viz. Heating - Taking 5mm Ti6Al4V alloy plates, and hot levelling it at 950-degree C; Surface Preparation: Repairing the surface by pickling, polishing and trimming the edges; and Pack Preparation which includes aligning and stacking of three Ti6Al4V alloy plate and tick welded from all sides to avoid dislocation of each substrate in the rolling process. The rolling causes deformation in the stacked substrates.
In accordance with an embodiment of the present invention, cut is made at the corners to maintain gaps thereby ensure passage of gases; the substrate which is in form of roll pack is heated in heating furnace. The next step involves hot rolling of the packet along the length direction; and reducing it to 1.5 mm sheets. Further steps involves annealing and post treatment.

ADVANTAGES AND APPLICATION
Ti-6Al-4V sheets developed from is method are often used in applications where strength, low weight, and resistance to corrosion are important, such as in aerospace, medical implants, and marine applications.
,CLAIMS:Claims:
We claim
1. A method of manufacturing 1.5 mm Ti6Al4V hot-rolled sheets, the method comprising the steps of
a. heating 5mm thick Ti6Al4V alloy plates to 950 degrees celsius;
b. preparing the surface of the heated plates by pickling, polishing, and trimming the edges;
c. preparing a pack by aligning and stacking three Ti6Al4V alloy plates, and welding the pack from all sides to prevent dislocation of each substrate during the rolling process;
d. making cuts at the corners of the pack to maintain gaps for the passage of gases;
e. heating the pack in a heating furnace;
f. hot rolling the pack along the length direction to reduce it to 1.5mm sheets; and
g. subjecting the rolled sheets to annealing and post-treatment.

2. The method of manufacturing 1.5 mm Ti6Al4V hot-rolled sheets as claimed in claim 1, wherein the hot leveling of the Ti6Al4V alloy plates at 950 degrees Celsius is carried out to achieve uniform thickness across the plates.

3. The method of manufacturing 1.5 mm Ti6Al4V hot-rolled sheets as claimed in claim 1, wherein the surface preparation comprises removing surface imperfections, oxides, and contaminants from the Ti6Al4V alloy plates.

4. The method of manufacturing 1.5 mm Ti6Al4V hot-rolled sheets as claimed in claim 1, wherein the alignment and stacking of the three Ti6Al4V alloy plates in the pack are performed to maintain consistent mechanical properties throughout the rolled sheets.

5. The method of manufacturing 1.5 mm Ti6Al4V hot-rolled sheets as claimed in claim 1, wherein the hot rolling process is conducted to induce deformation in the stacked substrates, thereby facilitating the formation of a two-phase titanium alloy comprising an alpha phase and a beta phase.