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Laser Surface Scanning Heat Treatment to Reduce Recrystallization for Directionally Solidified / Single Crystal Superalloys

IP.com Disclosure Number: IPCOM000198270D
Published in the IP.com Journal: Volume 10 Issue 8B (2010-08-23)
Included in the Prior Art Database: 2010-Aug-23
Document File: 1 page(s) / 90K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

By using Directional Solidification (DS) and Single Crystal (SC) technology, the mechanical properties of superalloys have been significantly improved due to elimination of the transverse grain boundaries perpendicular to the applied stress. Advanced superalloys are widely developed for gas turbine applications, e.g., DS or SC materials, due to their superior thermal, fatigue and creep properties. Although these superalloys have desirable mechanical strengths to very high temperatures, they tend to be susceptible to environmental influence on the surface, and especially, recrystallization layers may be formed during manufacturing process, high temperature application or rejuvenation/repair process. The recrystallization layer is often found on the leading and trailing edges as well as on the root or the cooling channels of gas turbine blades. When the recrystallisation layer is formed, the interface of the layer and matrix is sensitive to external loading because of incompatibility of deformation. Therefore, it has detrimental effects on the mechanical properties such as LCF, HCF or creep (LCF: Low-Cycle Fatigue; HCF: High-Cycle Fatigue).

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Laser Surface Scanning Heat Treatment to Reduce Recrystallization for alloys

Directionally Solidified / Single Crystal Super

Idea: Guofeng Chen, Ph.D, CN-Beijing; Lirong Ren, Ph.D, CN-Beijing

By using Directional Solidification (DS) and Single Crystal (SC) technology, the
of superalloys have been significantly improved due to elimination of the transverse perpendicular to the applied stress. Advanced superalloys are widely developed for applications, e.g., DS or SC materials, due to their superior thermal, fatigue and cre

Althou
to be susceptible to environmental influence on the surface, and especially, recryst may be formed during manufacturing process, high temperature application or rejuv process.

The recrystallization layer is
cooling channels of gas turbine blades. When the recrystallisation layer is formed layer and matrix is sensitive to external loading because of incompatibility of defor has detrimental effects on the mechanical properties such as LCF, HCF or creep (L Fatigue; HCF: High-Cycle Fatigue).

The current prevention of recrystallization layer formation is difficult during manufact formation is also hard to control. The cyclic recovery heat treatment of SC su demonstrate
time-consuming and energy-wasting. So, there is a need for easier and more cost e

Laser is one promising tool to heat up the surface temperature locally or comple temperature can be controlled through careful selection of power. Concerning to this of the plastically deformed region of DS/SC superalloy i
recrystallization.

A pulsed or continuous laser is employed to treat the surface of plastically deform by shot peening or indentation. The top te
laser treatment can be a little higher than the solvus of γ' phase for the first tre...