Integration of Hot Isostatic Pressing and Heat Treatment for Advanced Modified Γ-Tial Tnm Alloys
The conventional processing route of TNM alloys combines casting and hot isostatic pressing (HIP) followed by forging and multiple heat treatments to establish optimum properties. This is a time-consuming and costly process. In this study we present an advanced alternative TNM alloy processing route combining HIP and heat treatments into a single process, which we refer to as IHT (integrated HIP heat treatment). A Quintus HIP lab unit with a quenching module was used, achieving fast and controlled cooling, which differs from the slow cooling rates of conventional HIP units. Two modified TNM alloys with composition Ti-43.5Al-3.5Nb-1Mo-0.8B (at.%) and Ti-42.5Al-3.5Nb-1Mo-1.5B (at.%) were subjected to various thermomechanical processing routes with the objective of improving creep strength. The route involves two HIP steps at 200 MPa, one at 1250 ºC for 3 h and another at 1260 ºC for 1 h, both under a protective Ar atmosphere and followed by cooling at 30 K/min down to room temperature. The results reveal that applying IHT processing does indeed achieve enhanced creep strength, and the secondary creep rate of the IHT processed materials is similar to that of conventionally forged-TNM alloys. Thus, the proposed advanced IHT processing route can manufacture more cost-effective TiAl components
Year of publication: |
[2022]
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Authors: | Bernal, Daniel ; Chamorro, Xabier ; Hurtado, Iñaki ; Lopez-Galilea, Inmaculada ; Bürger, David ; Weber, Sebastian ; Madariaga, Iñaki |
Publisher: |
[S.l.] : SSRN |
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