Abstract
TA15 pre-alloyed powder chosen in this paper is made by plasma rotating electrode method. The powders were used to prepare fully dense TA15 alloy ingots by the means of hot isostatic pressing(HIP) forming technology. The optimum parameter of the HIP process is 900°C /120MPa/3h. After the process of hot isostatic pressing, the powders were pressed into a fully dense ingot. An optital microscope was used to observe the microstructure of the ingot specimen and its formation mechanism was analysized. The microstructure of the TA15 alloy prepared by hot isostatic pressing of pre-alloyed powder is composed of fine α-equiaxed grains along lamellar colony boundaries. The mechanical properties exceed that of the casting level, which is close to the forging level. A typical TA15 alloy component was finally produced by HIP-PM process.
Highlights
Powder metallurgy(PM) can produce titanium alloy components with high performance and low cost, it has advantages of defects free, homogenious microstructure, low inner stress[1-5]
Hot isostatic pressing PM generally use nitrogen and argon as pressure transfer medium, pre-alloyed powders were compacted under high temperature and high pressure
Mechanical properties are influenced by microstructures, different processing methods will lead to various microstructures, due to intrinsic difference of PM compared to casting and forging
Summary
Powder metallurgy(PM) can produce titanium alloy components with high performance and low cost, it has advantages of defects free, homogenious microstructure, low inner stress[1-5]. HIP-PM titanium alloy has no macrosegregation, and the mechanical properties can reach the forged level[6-9], secondly, HIP PM can produce components with a high stock utilization. Compared to other processings such as casting and forging, the stock utilization can increase from 10~20% to above 50%, and the cost can be reduced by 50~80% [10-12]. Powder metallurgy have been becoming a promising near-net-shape forming method. Mechanical properties are influenced by microstructures, different processing methods will lead to various microstructures, due to intrinsic difference of PM compared to casting and forging. TA15 alloy was selected to study PM microstructure and mechanical properties by hot isostatic pressing technology. PM TA15 ingots and typicall components was produced by HIP the microstructure formation mechanism and mechanical properties were studied
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