Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process

N. Bayat; G. R. Ebrahimi; A. Momeni; H. R. Ezatpour

doi:10.1007/s12613-018-1561-3

Volume 25 Issue 2

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文章导航 > 矿物冶金与材料学报（英文） > 2018 > 25(2): 181-189

N. Bayat, G. R. Ebrahimi, A. Momeni, and H. R. Ezatpour, Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process, Int. J. Miner. Metall. Mater., 25(2018), No. 2, pp. 181-189. https://doi.org/10.1007/s12613-018-1561-3

Cite this article as:

N. Bayat, G. R. Ebrahimi, A. Momeni, and H. R. Ezatpour, Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process, Int. J. Miner. Metall. Mater., 25(2018), No. 2, pp. 181-189. https://doi.org/10.1007/s12613-018-1561-3

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研究论文

Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process

Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar 9617976487, Iran
Department of Materials Science and Engineering, Hamedan University of Technology, Hamedan 6516913733, Iran
Faculty of Engineering, Sabzevar University of New Technology, Sabzevar 9615918339, Iran

通讯作者:
G. R. Ebrahimi E-mail: ebrahimi@hsu.ac.ir

中文摘要

Single- and two-step hot compression experiments were carried out on 16Cr25Ni6Mo superaustenitic stainless steel in the temperature range from 950 to 1150℃ and at a strain rate of 0.1 s^-1. In the two-step tests, the first pass was interrupted at a strain of 0.2; after an interpass time of 5, 20, 40, 60, or 80 s, the test was resumed. The progress of dynamic recrystallization at the interruption strain was less than 10%. The static softening in the interpass period increased with increasing deformation temperature and increasing interpass time. The static recrystallization was found to be responsible for fast static softening in the temperature range from 950 to 1050℃. However, the gentle static softening at 1100 and 1150℃ was attributed to the combination of static and metadynamic recrystallizations. The correlation between calculated fractional softening and microstructural observations showed that approximately 30% of interpass softening could be attributed to the static recovery. The microstructural observations illustrated the formation of fine recrystallized grains at the grain boundaries at longer interpass time. The Avrami kinetics equation was used to establish a relationship between the fractional softening and the interpass period. The activation energy for static softening was determined as 276 kJ/mol.

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Research Article

Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process

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Abstract

Abstract

Single- and two-step hot compression experiments were carried out on 16Cr25Ni6Mo superaustenitic stainless steel in the temperature range from 950 to 1150℃ and at a strain rate of 0.1 s^-1. In the two-step tests, the first pass was interrupted at a strain of 0.2; after an interpass time of 5, 20, 40, 60, or 80 s, the test was resumed. The progress of dynamic recrystallization at the interruption strain was less than 10%. The static softening in the interpass period increased with increasing deformation temperature and increasing interpass time. The static recrystallization was found to be responsible for fast static softening in the temperature range from 950 to 1050℃. However, the gentle static softening at 1100 and 1150℃ was attributed to the combination of static and metadynamic recrystallizations. The correlation between calculated fractional softening and microstructural observations showed that approximately 30% of interpass softening could be attributed to the static recovery. The microstructural observations illustrated the formation of fine recrystallized grains at the grain boundaries at longer interpass time. The Avrami kinetics equation was used to establish a relationship between the fractional softening and the interpass period. The activation energy for static softening was determined as 276 kJ/mol.
- superaustenitic stainless steel;
- dynamic recrystallization;
- static softening;
- metadynamic recrystallization;
- microstructural evolution;
- Avrami kinetics equation

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References

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Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process

中文摘要

Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process

Abstract

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