THE EFFECT OF SERVICE EXPOSE ON MICROSTRUCTURE AND CREEP MECHANISMS OF GAS TURBINE BLADES MADE OF IN738LC

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KOLAGAR ALI MOHAMMAD; CHERAGHZADEH MOHAMMAD; TABRIZI NARGES; SHAHRIARI MOHAMMAD SAEED

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Journal: METALLURGICAL ENGINEERING Year:2016 | Volume:19 | Issue:2 (62) Page(s): 146-160

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Title

THE EFFECT OF SERVICE EXPOSE ON MICROSTRUCTURE AND CREEP MECHANISMS OF GAS TURBINE BLADES MADE OF IN738LC

Author(s)

KOLAGAR ALI MOHAMMAD | CHERAGHZADEH MOHAMMAD | TABRIZI NARGES | SHAHRIARI MOHAMMAD SAEED | Issue Writer Certificate

Keywords

GAS TURBINE LADEQ2

USED BLADEQ2

CREEP MECHANISMSQ2

IN738LC NI-BASED SUPERALLOYSQ2

Abstract

Turbine blades operate on the different temperature and stress conditions. The various mechanisms contribute to the creep process and lead to turbine blade failure. The characterization of the CREEP MECHANISMS is critical to predict the creep behavior and design the useful life of turbine blade. This paper compares the creep behaviors of new and USED BLADEs (worked 3000 equal operating hours) based on IN738 superalloys by investigating the microstructure and using the creep models. Optical and scanning electron microscopes were applied to study the volume fraction, size of the primary and secondary precipitated phases (g’), change of the precipitated phases morphology (e.g. formed continuous carbide in grain boundaries or coarsening g’) and the formation of the creep pores. Furthermore, the dominated CREEP MECHANISMS are identified and compared the new blades with USED BLADEs at different stress rupture tests and real work conditions. The results show that at 760oC/586 MPa, the active CREEP MECHANISMS includes cutting and Orowan for both new and USED BLADEs. Whereas at 982oC/152 MPa, the dislocations climb, diffusion creep and grain boundary gliding are active for new blades and Orowan and the dislocations climb are operative for USED BLADEs.

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APA: Copy

KOLAGAR, ALI MOHAMMAD, CHERAGHZADEH, MOHAMMAD, TABRIZI, NARGES, & SHAHRIARI, MOHAMMAD SAEED. (2016). THE EFFECT OF SERVICE EXPOSE ON MICROSTRUCTURE AND CREEP MECHANISMS OF GAS TURBINE BLADES MADE OF IN738LC. METALLURGICAL ENGINEERING, 19(2 (62) ), 146-160. SID. https://sid.ir/paper/112369/en

Vancouver: Copy

KOLAGAR ALI MOHAMMAD, CHERAGHZADEH MOHAMMAD, TABRIZI NARGES, SHAHRIARI MOHAMMAD SAEED. THE EFFECT OF SERVICE EXPOSE ON MICROSTRUCTURE AND CREEP MECHANISMS OF GAS TURBINE BLADES MADE OF IN738LC. METALLURGICAL ENGINEERING[Internet]. 2016;19(2 (62) ):146-160. Available from: https://sid.ir/paper/112369/en

IEEE: Copy

ALI MOHAMMAD KOLAGAR, MOHAMMAD CHERAGHZADEH, NARGES TABRIZI, and MOHAMMAD SAEED SHAHRIARI, “THE EFFECT OF SERVICE EXPOSE ON MICROSTRUCTURE AND CREEP MECHANISMS OF GAS TURBINE BLADES MADE OF IN738LC,” METALLURGICAL ENGINEERING, vol. 19, no. 2 (62) , pp. 146–160, 2016, [Online]. Available: https://sid.ir/paper/112369/en

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