应变速率对GH690高温合金热变形特性的影响

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 27; no. 3; pp. 538 - 550
Main Author 石照夏;颜晓峰;段春华;赵明汉
Format Journal Article
LanguageEnglish
Published 2017
Subjects
GH690高温合金;热变形;应变速率;动态再结晶
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ISSN1003-6326

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Bibliography:In order to clarify the effect of strain rate on hot deformation characteristics of GH690superalloy,the hot deformationbehavior of this superalloy was investigated by isothermal compression in the temperature range of1000?1200°C and strain raterange of0.001?10s?1on a Gleeble?3800thermo-mechanical simulator.The results reveal that the flow stress is sensitive to the strainrate,and the dynamic recrystallization(DRX)is the principal softening mechanism.The strain rate of0.1s?1is considered to be thecritical point during the hot deformation at1000°C.The DRX process is closely related to the strain rate due to the adiabatictemperature rise.The strain rate has an important influence on DDRX and CDRX during hot deformation.The nucleation of DRXcan be activated by twin boundaries,and there is a lower fraction ofΣ3n(n=1,2,3)boundaries at the intermediate strain rate of0.1s?1.
43-1239/TG
GH690 superalloy; hot deformation; strain rate; dynamic recrystallization (DRX)
ISSN:1003-6326