高温合金
材料科学
开裂
晶界
可制造性设计
极限抗拉强度
硼
稳健性(进化)
冶金
复合材料
微观结构
机械工程
生物化学
化学
有机化学
工程类
基因
作者
Hao Yu,Jian Fu,Chenchong Wang,Yinping Chen,Lingyu Wang,H. Fang,Jinguo Li,Sybrand van der Zwaag,Wei Xu
标识
DOI:10.1016/j.actamat.2024.119658
摘要
To achieve an effective design of additively manufacturable Ni superalloys with decent service performance, a hybrid computational design model has been developed, where the strategy to tailor local elemental segregations was integrated within a scheme of minimizing the cracking susceptibility. More specifically, the phase boundary of primary NbC / γ matrix was introduced into the design routine to tune the spatial distribution of critical solutes at an atomic scale, thereby inhibiting the formation of borides and segregation-induced cracking. Based on the output of the design, new grades of Ni superalloy have been developed with excellent additive manufacturability, as confirmed by the robustness of printing parameters in fabricating low-defect-density samples. The capability of the phase boundaries to evenly distribute boron atoms was validated experimentally, and the cracking induced by uncontrolled boron segregation at grain boundaries was effectively prevented. The newly designed alloys showed good tensile properties and decent oxidation resistance at different service temperatures, which are comparable to those of conventionally produced superalloys. The finding that phase boundaries can be employed to prevent undesirable clustering of boron atoms can be extended to manipulate the distributions of other critical elements, which provides a new path for designing novel Ni superalloys with balanced printability and mechanical properties.
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