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周 舸,张思倩,张浩宇,于雪梅,刘丽荣,陈立佳.GH79合金高温变形行为及变形机理研究[J].稀有金属材料与工程(英文),2019,48(12):3939~3947.[Zhou Ge,Zhang Siqian,Zhang Haoyu,Yu Xuemei,Liu Lirong and Chen Lijia.Elevated Temperature Compression Deformation Behavior and Mechanism of GH79 Superalloy[J].Rare Metal Materials and Engineering,2019,48(12):3939~3947.]
Elevated Temperature Compression Deformation Behavior and Mechanism of GH79 Superalloy
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Received:August 14, 2018  Revised:October 08, 2018
DOI:
Key words: GH79 superalloy  deformation activation energy  strain rate sensitivity exponent  grain size exponent  processing map  deformation mechanism map
Foundation item:国家自然科学基金资助(51805335),
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Zhou Ge,Zhang Siqian,Zhang Haoyu,Yu Xuemei,Liu Lirong and Chen Lijia  
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Abstract:
      The hot compression deformation of GH79 superalloy were investigated systematically on a Gleeble-3800 thermal simulating tester. Based on the hot compression test behavior and mechanism on high temperature deformation behavior and microstructure evolution, the variation of strain rate sensitivity exponent m, activation energy Q and grain size exponent P values at different strain rates and different temperatures were obtained. The dynamic DMM hot processing map based on different instability criteria was drawn while the deformation mechanism maps incorporating dislocations the inside grains were obtained. The processing map was used to analyze the processing instability regime and appropriate processing regime. With the deformation mechanism maps, the Burgers vector compensated grain size, the dislocation evolution rule at modulus compensated flow stress and the modulus compensated stress and the dislocation quantities of GH79 superalloy at different temperatures, the hot deformation mechanisms were elucidated.