The Effects of Cooling Rate after Solutionizing on the Microstructural Evaluation of Cast IN718 Superalloy during Long-Term Thermal Exposure

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Hanachi Mehrdad; Khiabani Arash; SEYEDRAOUFI ZAHRA SADAT

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Journal: FOUNDING RESEARCH JOURNAL Year:2020 | Volume:4 | Issue:3 Page(s): 175-184

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Information Journal Paper

Title

The Effects of Cooling Rate after Solutionizing on the Microstructural Evaluation of Cast IN718 Superalloy during Long-Term Thermal Exposure

Author(s)

Hanachi Mehrdad | Khiabani Arash | SEYEDRAOUFI ZAHRA SADAT | Issue Writer Certificate

Keywords

IN718

Cooling Rate

Aging

Microstructure

Shear Transformation

Abstract

In the present study, cast IN718 superalloys solutionized at 1050◦ C for 150 min. Afterwards, the samples were quenched with three various Cooling Rates including 240◦ C/s, 5◦ C/s and 0. 1◦ C/s. After solutionizing, the samples were aged at 750◦ C for 30, 60, and 90 hrs. Microstructural investigation was carried out by optical microscopy (OM), Field Emission Scanning Electron Microscopy (FESEM), and X-ray diffraction (XRD). The results indicated that as the Cooling Rate increased, the conditions for complete dissolution were provided and only a small amount of MC carbide (TiC) phase remains in the matrix. By reducing the Cooling Rate and increasing Aging time, due to the increase in volume fraction and size of secondary precipitates, the Shear Transformation of the ''γ to δ increases, and consequently, the δ precipitates increased. After solutionizing, as the Cooling Rate increased, the hardness due to the decrease in the amount of cooling precipitates decreased. Besides, as the Aging time increases, due to the abnormal growth of precipitates, hardness first increased and then experienced a decrease.

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APA: Copy

Hanachi, Mehrdad, Khiabani, Arash, & SEYEDRAOUFI, ZAHRA SADAT. (2020). The Effects of Cooling Rate after Solutionizing on the Microstructural Evaluation of Cast IN718 Superalloy during Long-Term Thermal Exposure. FOUNDING RESEARCH JOURNAL, 4(3 ), 175-184. SID. https://sid.ir/paper/375353/en

Vancouver: Copy

Hanachi Mehrdad, Khiabani Arash, SEYEDRAOUFI ZAHRA SADAT. The Effects of Cooling Rate after Solutionizing on the Microstructural Evaluation of Cast IN718 Superalloy during Long-Term Thermal Exposure. FOUNDING RESEARCH JOURNAL[Internet]. 2020;4(3 ):175-184. Available from: https://sid.ir/paper/375353/en

IEEE: Copy

Mehrdad Hanachi, Arash Khiabani, and ZAHRA SADAT SEYEDRAOUFI, “The Effects of Cooling Rate after Solutionizing on the Microstructural Evaluation of Cast IN718 Superalloy during Long-Term Thermal Exposure,” FOUNDING RESEARCH JOURNAL, vol. 4, no. 3 , pp. 175–184, 2020, [Online]. Available: https://sid.ir/paper/375353/en

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