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논문 기본 정보

자료유형
학술저널
저자정보
Kuldeep K. Saxena (GLA University) Vivek Pancholi (Indian Institute of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.7
발행연도
2021.1
수록면
2,106 - 2,133 (28page)

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초록· 키워드

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Zr and its alloys are considered as strategic materials for nuclear industry. In nuclear industries, zirconium and its alloysare mostly used to manufacture the tubes for reactors. The properties of the end component i.e. tube is fully dependent onthe material processing route and the fnal microstructure. Therefore, in the present review paper, brief description of zirconium and its alloys is provided, bringing in the efect of various phase stabilizers and the microstructures after processing. Additionally, the processing route of Zr and Zr–Nb alloys are explained in terms of primary and secondary processing. Inprimary processing, the production of usable shapes is obtained through ingot melting followed by secondary operationssuch hot rolling or forging. Further, optimization of mechanical properties can be done by controlling the microstructureusing various thermo-mechanical processes. The secondary processing such as cold working and/or annealing also helps tocontrol the fnal microstructure to large extent. The microstructure control is fully dependent on the dominant deformationmechanism during the hot deformation. The dominant deformation mechanism depends on relative ease with which followingprocesses occur; dislocation generation and glide, cross slip and climb and, difusion. The possible restoration mechanismsfor diferent Zr-alloys are discontinuous dynamic recrystallization (DDRX), continuous dynamic recrystallization (CDRX),rotational recrystallization (RRX), geometric dynamic recrystallization (GDX), dynamic recovery (DRV) accompanied bygrain growth (GG). There are various techniques which helps to understand the hot deformation behaviour of any material. These techniques are; analysis of stress–strain data, development of processing maps, development of constitute equation. Atthe end, present paper summarises the work related to processing map, fndings of processing map in terms of safe processing parameter, dominant deformation mechanism, role of activation energies during deformation of Zr–Nb alloys and theirdiferent phases (i.e. single α or β phase, or two phase α+β).

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