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논문 기본 정보

자료유형
학술저널
저자정보
Sumit Kumar (Indian Institute of Technology) Anish Karmakar (Indian Institute of Technology) Sumeer K. Nath (Indian Institute of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10
발행연도
2021.10
수록면
3,875 - 3,890 (16page)
DOI
10.1007/s12540-020-00826-2

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초록· 키워드

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Hot forged 1Cr?1Mo and 9Cr?1Mo steels are being progressively used in the making of the turbine rotors of steam powerplants. Forging of these steels requires precise control of processing parameters (i.e. strain, strain rate and temperature) fora defect free product. In line with the above mentioned applications, a comparative study to analyze the hot deformationbehavior of both the steels was carried out in the temperature domain of 850?1050 °C with varying strain rate (0.001?0.1 s?1)by compression test data obtained from Gleeble 3800® thermomechanical simulator up to true strain of 0.69. The flow stressbehavior of hot compressed specimens was analyzed by using material constants, activation energy and formulated Zener?Hollomon parameter. Critical conditions for dynamic recrystallization (DRX) of both the steels were calculated with thehelp of a mathematical model developed by Poliak and Jonas. Further, the variations in critical conditions were correlatedwith the Zener?Hollomon parameter. For both the steels, the current study also focused on the comparison of dynamicallyrecrystallized austenite ( XDRX ) volume fraction with respect to true strain by applying the concept of Avrami equation. Finally, to validate the kinetics of DRX and softening mechanism, the microstructural evaluation and characterization havebeen carried out using optical and electron microscopy.

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