Effect of Remelting and Standard Heat Treatment on Microstructure and Mechanical Properties of IN738LC Superalloy

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SHAJARI YAZDAN; SEYEDRAOUFI ZAHRA SADAT; RAZAVI SEYED HOSSEIN; Nasri Mehdi; Khiabani Arash

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Journal: FOUNDING RESEARCH JOURNAL Year:2020 | Volume:4 | Issue:2 Page(s): 99-109

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Title

Effect of Remelting and Standard Heat Treatment on Microstructure and Mechanical Properties of IN738LC Superalloy

Author(s)

Keywords

IN738LC

Re-melting

Heat Treatment

Microstructure

Strength

Abstract

In the present study, IN738LC superalloy ingot was re-melted and cast, then heat treated under standard conditions. Microstructural studies with field emission scanning electron microscopy (FESEM) equipped energy dispersive spectroscopy (EDS) showed that after Re-melting and controlled casting, the amount of porosity and size of γ ' precipitates decreases. Also, with applying the standard Heat Treatment cycle, the primary γ ' precipitates less than 1µ m in size and cubic morphology and nanospherical secondary γ ' precipitates appeared and eutectic γ-γ ˈ regions were completely eliminated. Vickers hardness test results under a load of 10 Kg showed that the lowest hardness is related to the solutionized sample due to remove the coarsened γ ' precipitates and the highest hardness (833 H. V. ) is obtained after aging. According to the results of the tensile test at ambient and 750◦ C temperatures, by Re-melting and applying the standard Heat Treatment due to structural modification, Strength and elongation increased at both ambient temperature and 750◦ C. Also, with applying the standard Heat Treatment, failure mechanism of IN738LC superalloy was transferred from brittle trans-dendritic failure to brittle inter-dendritic failure with little footprints of ductile fracture.

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APA: Copy

SHAJARI, YAZDAN, SEYEDRAOUFI, ZAHRA SADAT, RAZAVI, SEYED HOSSEIN, Nasri, Mehdi, & Khiabani, Arash. (2020). Effect of Remelting and Standard Heat Treatment on Microstructure and Mechanical Properties of IN738LC Superalloy. FOUNDING RESEARCH JOURNAL, 4(2 ), 99-109. SID. https://sid.ir/paper/374804/en

Vancouver: Copy

SHAJARI YAZDAN, SEYEDRAOUFI ZAHRA SADAT, RAZAVI SEYED HOSSEIN, Nasri Mehdi, Khiabani Arash. Effect of Remelting and Standard Heat Treatment on Microstructure and Mechanical Properties of IN738LC Superalloy. FOUNDING RESEARCH JOURNAL[Internet]. 2020;4(2 ):99-109. Available from: https://sid.ir/paper/374804/en

IEEE: Copy

YAZDAN SHAJARI, ZAHRA SADAT SEYEDRAOUFI, SEYED HOSSEIN RAZAVI, Mehdi Nasri, and Arash Khiabani, “Effect of Remelting and Standard Heat Treatment on Microstructure and Mechanical Properties of IN738LC Superalloy,” FOUNDING RESEARCH JOURNAL, vol. 4, no. 2 , pp. 99–109, 2020, [Online]. Available: https://sid.ir/paper/374804/en

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