銲後熱處理對Fe-Co-Ni-Cr-Cu-Alx-C0.1銲件性能影響之研究

Abstract

摘要 〔本研究主要係以FeCoNiCrCuAlxC0.1高熵合金鑄件進行一系列銲後熱處理研究，探討其機械性質與顯微組織〕，實驗方法包括TIG銲接，真空熱處理，金相顯微組織觀察，微硬度試驗及成份分析等。 實驗結果顯示，Al含量具有提升FeCoNiCrCuAlxC0.1高熵合金鑄件及銲件室溫強化能力，高熵合金硬度隨Al含量增加而提升。此外，800~1000℃熱處理0.5~8小時後空冷，對FeCoNiCrCuAlxC0.1高熵合金銲件具有過時效或均質化效果。 整體而言，FeCoNiCrCuAlxC0.1高熵合金銲件，於800~1000℃持溫0.5~8小時熱處理空冷後，仍可維持一定硬度。

ABSTRACT

This study was aimed at the investigation of the effect of postweld heat treatment on the mechanical properties and microstructures of Gas Tungsten Arc Welding (GTAW or TIG) weldments of newly developed high-entropy alloys. The alloys used were three casting alloys of FeCoNiCrCuAlxC0.1, where x = 0, 0.5, 1.0. A series experiments included TIG welding, microhardness measurements, metallography, SEM and EDS analysis were conducted in this investigation. The experimental results show that the aluminum addition can effectively increase the hardness at room temperature. At higher temperatures, the effect of precipitation strengthening can be appeared . The heat treatments of 800℃–1000℃ for 0.5–8 hours can give better annealing and homogenous results. Therefore, these new alloys are good candidates for high temperature application.