Microstructure and tensile properties optimization of MIM418 superalloy by heat treatment

Microstructure and tensile properties optimization of MIM418 superalloy by heat treatment
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热处理优化MIM418高温合金的显微组织和拉伸性能

DOI:
10.1016/j.jmatprotec.2015.08.001
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发表时间:
2016
影响因子:
6.3
通讯作者:
Li Zhou
Li Zhou
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhang Lin;Li Dan;Qu Xuanhui;Qin Mingli;He Xinbo;Li Zhou

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与直接时效相比,固溶+时效导致更细小和更均匀的γ′相析出。在1220 °C下的固溶处理消除了大的初生γ′相,并用均匀的二次γ′相代替它们。γ′颗粒的粗化符合Ostwald熟化机理。对于欠时效试样,临界分辨剪切应力(CRSS)增加,随后在γ′颗粒尺寸约为100 nm处达到最大值,而对于过时效试样,CRSS减小。这一结果与750 °C × 24 h时效试样的最高屈服强度和显微硬度相吻合。
Solution plus ageing leads to the precipitation of finer and more homogeneousγ′ precipitates in comparison to direct ageing. Solution treatment at 1220 °C eliminates the large primaryγ′ phase and replaces them with homogeneous secondaryγ′ precipitates. Coarsening ofγ′ particles according to Ostwald ripening mechanism is confirmed. An increase of the critical resolved shear stress (CRSS) is observed for the under-aged specimens, followed by a maximum of CRSS atγ′ particle size of around 100 nm and a decrease of CRSS for the over-aged specimen. This result agrees well with the highest yield strength and microhardness of the 750 °C × 24 h aged specimens.
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