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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Thermal Exposure on the Microstructures and Mechanical Properties of a Superalloy
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Influence of Thermal Exposure on the Microstructures and Mechanical Properties of a Superalloy

机译：热暴露对高温合金组织和力学性能的影响

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摘要

The effects of long-term aging on microstractures and their influence on tensile and stress-rupture behavior of a corrosion resistant nickel-base superalloy are investigated. Samples are aged isothermally at 1073, 1123, or 1173 K for different times of up to 10,00(1 Ii and mechanical tests are performed on samples in both standard heat treatment (SHT) and aged conditions. Scanning electron microscopy (SEM) studies reveal that the coarsening kinetics of gamma' follows a linear law at different temperatures with the calculated activation energy, i.e., 255 kJ/mol, for gamma' growth according to Lifshitz-Slyozof-Wagner (LSW) theory. After long-term aging for more than 1 khours, sigma phase appears in the alloy. The kinetics of a formation can be described by the Johnson-Avrime-Mehl equation. Tensile experiments at room temperature and 1173 K and endurance experiments at 1173 K7274 MPa are performed to test the effect of sigma phases on these properties and no remarkable harmful effect is found, gamma' coarsening can be used to explain the redaction of yield stress, which is tested by the Labusch-Schwarz hardening theory. Although the presence of the sigma phase clearly does affect the fracture process, the sigma phase does not embrittle the alloy.
机译：研究了长期时效对显微组织的影响及其对耐腐蚀镍基高温合金的拉伸和应力-断裂行为的影响。样品在1073、1123或1173 K下等温老化，时间长达10,00（1 Ii），并在标准热处理（SHT）和老化条件下对样品进行了机械测试。揭示了根据Lifshitz-Slyozof-Wagner（LSW）理论，γ'的粗化动力学在不同温度下具有线性定律，并且计算出的活化能为255 kJ / mol，这是根据Lifshitz-Slyozof-Wagner（LSW）理论得出的。超过1 khours，合金中出现σ相，可用Johnson-Avrime-Mehl方程描述动力学，在室温和1173 K下进行拉伸试验，在1173 K7274 MPa下进行耐力试验，以验证其效果。 σ相对这些性质的影响，没有发现明显的有害影响，可以使用Labusch-Schwarz硬化理论对γ的粗化来解释屈服应力的变红。显然确实会影响断裂过程，σ相不会使合金脆化。

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