Nanoindentation based properties of Inconel 718 at elevated temperatures: A comparison of conventional versus additively manufactured samples
Nanoindentation based properties of Inconel 718 at elevated temperatures: A comparison of conventional versus additively manufactured samples
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DOI：
10.1016/j.ijplas.2019.04.018
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发表时间：
2019-09
影响因子：
9.8
通讯作者：
Hao Wang;A. Dhiman;Halsey E. Ostergaard;Yang Zhang;T. Siegmund;J. Kruzic;V. Tomar
中科院分区：
文献类型：
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作者：
Hao Wang;A. Dhiman;Halsey E. Ostergaard;Yang Zhang;T. Siegmund;J. Kruzic;V. Tomar
在这项工作中，在室温、350°C 和 650°C 下测量了传统和增材制造的 Inconel 718 (IN718) 在固溶和时效 (SA) 热处理后随温度变化的机械性能。使用纳米压痕技术获得材料特性，包括硬度、折合模量、蠕变速率、蠕变应力指数和热激活体积。在每个温度下分析压痕尺寸效应（ISE）。随着温度从室温升高到 650°C，传统样品的降低模量降低了 26%，AM 样品降低了 22%。传统样品的纳米压痕硬度下降了 19%，增材制造样品的纳米压痕硬度下降了 16%。在 650°C 的蠕变测试中，蠕变应力指数在 8-18 范围内，表明所检测的纳米/微米尺度的变形是由位错攀爬机制控制的。
In this work, temperature dependent mechanical properties of conventional and additive manufactured Inconel 718 (IN718) after solution and aging (SA) heat treatment were measured at room temperature, 350°C, and 650°C. Nanoindentation technique was used to obtain material properties including hardness, reduced modulus, creep rate, creep stress exponent, and thermal activation volume. The indentation size effect (ISE) was analyzed at each temperature. The reduced modulus was measured to decrease by 26% for the conventional samples and by 22% for AM samples as temperature increases from room temperature to 650 °C. The nanoindentation hardness decreases by 19% for the conventional samples and 16% for the AM samples. During the creep tests at 650 °C, the creep stress exponent was found in the range of 8–18, indicating that the deformation at the examined nano/micro scale is controlled by the dislocation climb mechanism.