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论文类型：期刊论文

发表时间：2018-12-01

发表刊物：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

收录刊物：SCIE、Scopus

卷号：27

期号：12,SI

页面范围：6426-6434

ISSN号：1059-9495

关键字：grain boundary characteristics; microstructure characterization; Ni-Cr-Mo-based superalloy; static recrystallization

摘要：In order to clarify the microstructure evolution characteristics during holding period after slight degree of deformation for a Ni-Cr-Mo-based C276 superalloy, two-stage isothermal compression tests have been performed at the temperature range of 1000-1150 degrees C and the strain rate range of 0.1-5s(-1). The stress-strain curves and microstructure observation infer that both static recovery (SRV) and static recrystallization (SRX) took place during the holding period when the specimens were deformed at 1100-1150 degrees C and only SRV occurred in the specimens that deformed at the temperatures lower than 1100 degrees C. The softening effects increase with the increasing temperature and deformation degree, while the influence of strain rate seems less pronounced because of the limited stored energy resulted from the small deformation. The grain boundary characteristics, analyzed using electron backscatter diffraction technique, indicate that high densities of twins and sigma 3 grain boundaries form associated with the nucleation and growth of SRX grains. Finally, the recrystallization during and after deformation, i.e., dynamic recrystallization, SRX and metadynamic recrystallization, was discussed concurrently.