Abstract
Pack rolling method is preferred to conventional rolling method to process thin sheets or foils out of titanium alloys because of their relatively narrow processing window and possible surface contamination during the elevated temperature processing. In this paper, the core sheets of 5mm thick with equiaxed alpha + transformed beta structure were encapsulated in mild steel cover material and hot rolled in a four high reversing hot rolling mill. The following results were obtained; The optimal pack assembly condition and pack rolling process factor were produced. The effect that the difference in deformation resistance of cover material and core material in pack rolling has been considered. The S45C mild steel is the most suitable for the cover material. The cover material is subjected to the same rolling process as the core material when the initial core and total thickness ratio is 0.3. The reduction in pack rolling should be selected in the range of 20% to 25% to produce flat sheet. Tensile properties of the pack rolled sheet are isotropic in both RD and TD rolling direction which meet the requirements of the standard AMS4911.
Highlights
Titanium based alloy sheets were considered as suitable candidate materials for advanced aerospace structures and automotive structural components due to their high corrosion resistance, low density, high strength, and good formability [1, 2]
Tensile test specimens were cut along the rolling direction (RD) and transverse direction (TD) from the pack rolled thin plates and test were carried out with AMS 4911
In case of the thickness ratio of core and total before rolling is different as shown in Fig 1. (a)-(d), the thickness of the core sheets becomes thinner with increasing the thickness of the cover plate and some buckling seems to occur at 0.45 and 0.6 thickness ratio in the rolling direction
Summary
Titanium based alloy sheets were considered as suitable candidate materials for advanced aerospace structures and automotive structural components due to their high corrosion resistance, low density, high strength, and good formability [1, 2]. Among various titanium based alloys the two phase alpha-beta alloys constitute the group which has the most diverse applications especially in structural applications. Ti-6Al-4V alpha-beta titanium alloy is the most commonly used alloy accounting for about 80% of total titanium alloy production globally. The manufacturing of Ti-6Al-4V alloy sheets, foil or thin structural sections are very difficult by elevated temperature processing. It has narrow processing window that the flow stress of Ti-6Al-4V alloy increases sharply when the alloy surface temperature decreases from 940°C to 850°C[3]. Titanium and its alloys are hampered by the atmospheric contamination during elevated temperature processing
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