Development of processing maps for a Ni-based superalloy
Development of processing maps for a Ni-based superalloy
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DOI：
10.1016/j.matchar.2006.09.004
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发表时间：
2007-10
影响因子：
4.7
通讯作者：
D. Cai;Liangyin Xiong;Wenchang Liu;Guidong Sun;M. Yao
中科院分区：
文献类型：
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作者：
D. Cai;Liangyin Xiong;Wenchang Liu;Guidong Sun;M. Yao
采用热压缩试验研究了ni基高温合金在1050 ~ 1180℃、应变速率0.01 ~ 10 s−1范围内的热变形特性。热加工的加工图是基于温度和应变速率下的功率耗散效率的变化，并使用动态材料模型进行解释。给出了热变形方程，描述了峰值应力随温度和应变速率的变化规律。镍基高温合金的热变形表观活化能约为496 kJ/mol。在0.1 ~ 0.7应变范围内得到的ni基高温合金的加工图基本相似，说明应变没有显著影响。在1140°C和0.01 s−1左右，能谱图呈现出清晰的区域；该结构域对不同菌株的效率最高可达36-41%。在热变形显微组织观察的基础上，在应变为0.7时的加工图中可以识别出完整的再结晶区。
The hot deformation characteristics of a Ni-based superalloy were studied in the temperature range 1050–1180 °C and strain rate range 0.01–10 s−1using hot compression tests. Processing maps for hot working were developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate, interpreted using a dynamic materials model. A hot deformation equation is given to characterize the dependence of peak stress on the temperature and strain rate. A hot deformation apparent activation energy of the Ni-based superalloy is about 496 kJ/mol. The processing maps of the Ni-based superalloy obtained in a strain range of 0.1–0.7 are essentially similar, which indicates that strain does not have a significant influence. The maps exhibit a clear domain with its peak efficiency at about 1140 °C and 0.01 s−1; the domain has its peak efficiency of about 36–41% for different strains. On the basis of hot deformation microstructural observations, the full recrystallization region can be identified in the processing map at a strain of 0.7.