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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution and mechanical properties of Inconel 740H during aging at 750 ℃
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Microstructure evolution and mechanical properties of Inconel 740H during aging at 750 ℃

机译：Inconel 740H在750℃时效时的组织演变和力学性能

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摘要

The microstructure evolution of Inconel 740H during aging at 750 ℃ for up to 3000 h was investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), three-dimensional atom probe (3DAP) analysis and micro-phase analysis. The mechanical properties of samples after aging were also studied. The grain size increased substantially during the whole aging period. Two different types of grain boundary carbides were observed; block-shaped and needle-shaped. Both were identified to be M_(23)C_6 by selected area diffraction measurements. The grain boundary carbides did not coarsen significantly during aging, with the weight fraction increasing only from 0.20% to 0.28%. In contrast, a much higher coarsening rate of γ precipitates was observed, as evidenced from both TEM observations and SAXS analysis. 3DAP was used to study the elemental partitioning behavior between γ precipitates and y matrix as well as the evolution in width of the γ/γ′ interface. A large increase in the width of γ/γ' interfaces was seen between 1000 h and 3000 h aging. In addition, for the sample aged at 750 ℃ for 3000 h, Cr enrichment on the γ matrix side of the γ/γ′ interface was found. Tensile tests at 750 ℃ of the aged samples showed a gradual decrease in elevated-temperature yield strength after 500 h, when this alloy was over-aged. The critical precipitate size for the transition from precipitate cutting by weakly coupled dislocations to strongly coupled dislocations for Inconel 740H was calculated to be approximately 50 nm, which agrees well with the experiment measurements of elevated-temperature yield strength. The room temperature impact toughness of all samples decreased during aging as the grain size kept growing.
机译：利用光学显微镜（OM），扫描电子显微镜（SEM），透射电子显微镜（TEM），小角度X射线散射（SAXS）研究了Inconel 740H在750℃下时效3000 h时的组织演变。 ），三维原子探针（3DAP）分析和微相分析。还研究了老化后样品的机械性能。在整个时效期间，晶粒尺寸显着增加。观察到两种不同类型的晶界碳化物。块状和针状。通过选择的区域衍射测量，两者均被确定为M_（23）C_6。在时效过程中，晶界碳化物没有明显变粗，重量分数仅从0.20％增加到0.28％。相比之下，从TEM观察和SAXS分析都可以看出，γ析出物的粗化速率更高。 3DAP用于研究γ沉淀物与y矩阵之间的元素分配行为以及γ/γ'界面宽度的演变。在1000 h和3000 h的老化之间，γ/γ'界面的宽度大大增加。此外，对于在750℃时效3000 h的样品，在γ/γ'界面的γ基质侧发现了Cr富集。在750℃时效试样的拉伸试验中，当这种合金过时效后500 h，高温屈服强度逐渐降低。对于因康镍合金740H，从通过弱耦合位错切割析出物到强耦合位错的转变，临界析出物的大小约为50 nm，这与高温屈服强度的实验测量值非常吻合。随着晶粒尺寸的不断增长，所有试样的室温冲击韧性在老化过程中均下降。

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