Effect of pre-treatment on hot deformation behavior and processing map of an aged nickel-based superalloy
Effect of pre-treatment on hot deformation behavior and processing map of an aged nickel-based superalloy
复制标题
预处理对时效镍基高温合金热变形行为及加工图的影响
DOI：
10.1016/j.jallcom.2015.07.213
复制
发表时间：
2015-11-15
影响因子：
6.2
通讯作者：
Chen, Xiao-Min
中科院分区：
文献类型：
--
作者：
He, Dao-Guang;Lin, Y. C.;Chen, Xiao-Min
研究了两种预处理镍基高温合金在较宽应变速率和温度范围内的热变形行为。基于动态材料模型（DMM）理论，建立了加工图，并与变形的显微组织进行了关联。详细讨论了水冷预处理和炉冷预处理对热变形行为和加工图的影响。结果表明，时效后的高温合金的热变形行为和加工图对预处理非常敏感。时效高温合金经炉冷预处理后的峰值应力大于经水冷预处理后的峰值应力。考虑变形温度、应变和应变速率的耦合效应，建立了两种预处理镍基高温合金的现象学本构模型。同时，经炉冷预处理的时效高温合金的流动不稳定区域比经水冷预处理的要窄。在真应变为0.6时，经过水冷预处理的时效高温合金的流动不稳定域为（920 ~ 1010℃，0.1 ~ 1s(-1)），而经过炉冷预处理的时效高温合金的流动不稳定域为（930 ~ 970℃，0.1 ~ 1s(-1)）。高温合金经炉冷预处理后的动态再结晶晶粒尺寸小于水冷预处理后的动态再结晶晶粒尺寸。(C) 2015 Elsevier B.V.版权所有
Hot deformation behaviors of two pre-treated nickel-based superalloys are investigated over wide ranges of strain rate and temperature. Based on the theory of dynamic material model (DMM), the processing maps are developed and correlated with the deformed microstructures. The effects of pre-treatment, including water-cooling and furnace-cooling pre-treatments, on the hot deformation behavior and processing maps are discussed in detail. It is found that the hot deformation behavior and processing map of the aged superalloy are sensitive to pre-treatment. The peak stress of the aged superalloy after furnace-cooling pre-treatment is larger than that after water-cooling pre-treatment. Considering the coupled effects of deformation temperature, strain and strain rate, the phenomenological constitutive models of two pre-treated nickel-based superalloys are established. Meanwhile, the flow instability domains of the aged superalloy after furnace-cooling pre-treatment are narrower than those after water-cooling pre-treatment. At the true strain of 0.6, the flow instability domain of the aged superalloy after water-cooling pre-treatment is (920-1010 degrees C, 0.1-1s(-1)), while that after furnace-cooling pre-treatment is (930-970 degrees C, 0.1-1s(-1)). Additionally, the dynamic recrystallized grain size of the studied superalloy after furnace-cooling pre-treatment is smaller than that after water-cooling pre-treatment. (C) 2015 Elsevier B.V. All rights reserved.