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Effect of strain rate on hot deformation characteristics of GH690 superalloy 被引量:6

应变速率对GH690高温合金热变形特性的影响(英文)
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摘要 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. 为阐明应变速率对GH690高温合金热变形特性的影响,采用Gleeble-3800热力模拟试验机,通过变形温度范围为1000~1200°C、应变速率范围为0.001~10 s^(-1)的等温热压缩实验研究了该合金的热变形行为。结果表明:流变应力对应变速率变化敏感,动态再结晶是主要的软化机制;0.1 s^(-1)是1000°C热变形过程中的临界应变速率。绝热温升使得动态再结晶过程与应变速率密切相关;应变速率对热变形过程中的非连续动态再结晶和连续动态再结晶具有显著影响;孪晶可促进动态再结晶形核,Σ3~n(n=1,2,3)晶界在中等应变速率0.1 s^(-1)条件下含量较低。
作者 Zhao-xia SHI Xiao-fengYAN Chun-hua DUAN Ming-han ZHAO 石照夏;颜晓峰;段春华;赵明汉(钢铁研究总院高温材料研究所,北京100081;钢铁研究总院高温合金新材料北京市重点实验室,北京100081)
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第3期538-550,共13页 中国有色金属学报(英文版)
基金 Special Project(2013) supported by China’s National Development and Reform Commission for R&D and Industrialization of New Materials
关键词 GH690 superalloy hot deformation strain rate dynamic recrystallization (DRX) GH690高温合金 热变形 应变速率 动态再结晶
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