Observations on Dynamic Strain Aging Manifestation in Inconel 718 Superalloy
Observations on Dynamic Strain Aging Manifestation in Inconel 718 Superalloy
复制标题
Inconel 718 高温合金动态应变时效表现的观察
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
L. H. de Almeida
中科院分区：
文献类型：
--
作者：
M. C. Rezende;L. S. Araújo;S. B. Gabriel;J. Dille;L. H. de Almeida
本文报道了Inconel 718合金动态应变时效的表现。对固溶退火和时效处理后的不同显微组织的材料进行了分析。拉伸测试在二次真空下进行，温度范围在200 °C和950°C之间，应变速率为3.2 X 10-3至3.2 X 10-5 s-1。结果显示了DSA的发生范围。分析表明，在约200至450°C的较低温度下，锯齿由碳的扩散控制。在更高的温度下，直到800°C，DSA与其他热激活现象的发生相一致：动态沉淀，特别是“α”和氧化辅助晶间开裂（OAIC）。据观察，竞争现象直接影响DSA表现由于铌在固溶体中的可用性。
The manifestation of dynamic strain aging (DSA) in Inconel 718 is reported in this work. Analysis were performed in the material with different microstructures resulting from solution anneal and aging treatment. Tensile tests were made under secondary vacuum with temperature ranging between 200 and 950°C and strain rates of 3.2 x 10-3 to 3.2 x 10-5 s-1. Results showed the range of DSA occurrence. Analysis indicates that at lower temperatures, from approximately 200 to 450°C, serrations are controlled by the diffusion of carbon. At higher temperatures, until 800°C, DSA coincided with the occurrence of other thermally activated phenomena: dynamic precipitation, especially γ’’, and Oxidation Assisted Intergranular Cracking (OAIC). It was observed that competitive phenomena affect DSA manifestation directly due to the availability of niobium in solid solution.