Rejuvenation of serviced-exposed turbine blades by application of warm hydro static pressure

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Mahdizadeh Mehrjoo Pouria; Hemmati Seyed Jalal

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF MANUFACTURING ENGINEERING Year:2018 | Volume:4 | Issue:2 Page(s): 39-50

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Information Journal Paper

Title

Rejuvenation of serviced-exposed turbine blades by application of warm hydro static pressure

Author(s)

Mahdizadeh Mehrjoo Pouria | Hemmati Seyed Jalal | Issue Writer Certificate

Keywords

Hot iso-static pressing

Creep life

Blade microstructure

Monkman-Grant relationship

Larson-Miller parameter

Abstract

Currently, improving microstructure of new casted turbine blades by applying uniform pressure at high temperatures is considered as one of the common steps in their production. The operation performed on the serviced-exposed blades can be effective in extending the blade lifetime through the closing and welding of creeping cavities and micro cracks. Due to the lack of adequate existing information, the present study attempts to create the same conditions by studying the experimental process. For this purpose, at first, a special measuring fixture was designed and fabricated. Then, a disc containing 75 first-row blades of the Ruston power turbine was measured on longitudinal direction, and six of them were selected with the highest longitudinal creep. In the next step, the pressure and high temperature tank as well as the furnace needed for the tests were prepared and adjusted. The samples were then subjected to a pressure of 150 bar and a temperature of 380 ° C for eight hours. Metallographic studies showed that the percentage of 􀢽 ′ phase in various areas of airfoil increased by about 25%, and the hardness in these areas was increased by a maximum of 7%, which, according to the operating conditions, indicated that the mechanisms for improving the microstructure were active. Using the experimental data and the Monkman-Grant relationships and the Larson-Miller parameter, it is expected that the Creep life of this blades will increase by about eight thousand hours.

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APA: Copy

Mahdizadeh Mehrjoo, Pouria, & Hemmati, Seyed Jalal. (2018). Rejuvenation of serviced-exposed turbine blades by application of warm hydro static pressure. IRANIAN JOURNAL OF MANUFACTURING ENGINEERING, 4(2 ), 39-50. SID. https://sid.ir/paper/268235/en

Vancouver: Copy

Mahdizadeh Mehrjoo Pouria, Hemmati Seyed Jalal. Rejuvenation of serviced-exposed turbine blades by application of warm hydro static pressure. IRANIAN JOURNAL OF MANUFACTURING ENGINEERING[Internet]. 2018;4(2 ):39-50. Available from: https://sid.ir/paper/268235/en

IEEE: Copy

Pouria Mahdizadeh Mehrjoo, and Seyed Jalal Hemmati, “Rejuvenation of serviced-exposed turbine blades by application of warm hydro static pressure,” IRANIAN JOURNAL OF MANUFACTURING ENGINEERING, vol. 4, no. 2 , pp. 39–50, 2018, [Online]. Available: https://sid.ir/paper/268235/en

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