Influence of the Starting Microstructure on the Hot Deformation Behavior of a Low Stacking Fault Energy Ni-based Superalloy
Influence of the Starting Microstructure on the Hot Deformation Behavior of a Low Stacking Fault Energy Ni-based Superalloy
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DOI：
10.1007/s11661-018-4539-x
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
J. McCarley;B. Alabbad-;S. Tin
中科院分区：
文献类型：
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作者：
J. McCarley;B. Alabbad-;S. Tin
初生伽马沉淀物的不同分数对含有 24 wt pct 的实验镍基高温合金的热变形和退火行为的影响。 Co被调查。在 1110°C 或 1135°C 热处理的钢坯在 1020°C 至 1060°C 的温度范围和应变速率从 0.001 至 0.1/s 的范围内进行热压缩试验。在变形状态下使用电子背散射衍射以及在 1140°C 下进行 1 小时的超固溶度退火热处理来表征微结构。这项研究试图量化和了解初生γ′沉淀物的体积分数对退火后低堆垛层错高温合金中的动态再结晶行为和由此产生的长度分数Σ3孪晶界的影响。尽管较低温度和较高应变速率下的变形导致两种起始显微组织发生动态再结晶，但在应变速率为 0.1/s 和 0.05/s 变形的 1135 °C 坯料显微组织中观察到相对较低的再结晶分数。与 1110 °C 退火的坯料微观结构相比，1135 °C 坯料微观结构的后续退火导致退火孪晶比例更高。
The influence of varying fractions of primary gamma prime precipitates on the hot deformation and annealing behavior of an experimental Nickel-based superalloy containing 24 wt pct. Co was investigated. Billets heat treated at 1110 °C or 1135 °C were subjected to hot compression tests at temperatures ranging from 1020 °C to 1060 °C and strain rates ranging from 0.001 to 0.1/s. The microstructures were characterized using electron back scatter diffraction in the as-deformed condition as well as following a super-solvus anneal heat treatment at 1140 °C for 1 hour. This investigation sought to quantify and understand what effect the volume fraction of primary gamma prime precipitates has on the dynamic recrystallization behavior and resulting length fraction ∑3 twin boundaries in the low stacking fault superalloy following annealing. Although deformation at the lower temperatures and higher strain rates led to dynamic recrystallization for both starting microstructures, comparatively lower recrystallized fractions were observed in the 1135 °C billet microstructures deformed at strain rates of 0.1/s and 0.05/s. Subsequent annealing of the 1135 °C billet microstructures led to a higher proportion of annealing twins when compared to the annealed 1110 °C billet microstructures.