熱均壓(Hot Isostatic Pressing, HIP)技術已廣泛應用於鑄造工業以去除鑄造過程中所產生之內部孔隙，它結合了高溫及高壓方式以提供材料較佳的性質，並改善鑄造材料的強度、延展性與疲勞壽命。Inconel 713 LC為使用在航太工業上最多的超合金材料，同時具有優越的高溫抗腐蝕性、強度、潛變及疲勞等性質。Inconel 713 LC超合金是典型的γ´ (Ni3Al,Ni3Ti)在γ基地上析出，隨著γ´析出量的增加而提高強度。
本研究主要探討熱均壓製程對Inconel 713 LC鑄造超合金之影響，Inconel 713 LC超合金實驗中，使用三種不同之熱均壓溫度包括1180、1195與1210 °C；二種不同之熱均壓壓力為1500及1750 Bar；二種不同的保溫保壓時間為2及4小時。同樣利用常溫及高溫拉伸試驗、孔隙率、TEM與XRD顯微結構等分析來評估熱均壓製程對鑄造超合金性質之影響。
由本研究結果，Inconel 713 LC鑄造超合金的最佳熱均壓製程為1180°C, 1750Bar, 2hours，明顯地降低其孔隙率與增加拉伸強度與伸長率、改善偏析組織。

Hot Isostatic Pressing (HIP) is widely used in the casting industry to remove the internal porosity generated during the casting process. It combines higher pressure and temperature to produce materials and parts with substantially better properties than those by other methods. This results in improved strength, ductility and fatigue life of castings. Inconel 713 LC is the most widely used superalloy for aerospace applications. The Inconel 713 LC nickel-based superalloy have decent corrosion resistance, high strength and ambient temperature and excellent creep and fatigue strengths at high temperature. Inconel 713 LC superalloy typically consists of γ´ (Ni3Al,Ni3Ti) dispersed in a γ matrix and the strength increases with increasing volume fraction of γ´.
The aim of this paper is to discuss the methods and to find a suitable soaking time of HIP for Inconel 713 LC superalloy castings. In the study of Inconel 713 LC superalloy, the parameters of HIP process included of three different temperatures are used: 1180, 1195 and 1210°C, two different pressures are used: 1500 and 1750 Bar and two different soaking times are 2 and 4 hours. The Inconel 713 LC superalloy is used throughout this study. To evaluate the mechanical properties and compare the effects of microstructure with tensile properties of Inconel 713 LC superalloy made by HIP process, two different strain rates of tension test at room and high temperature were evaluated. The TEM microstructure and XRD inspections were performed.
The experiment as results show that 1180°C, 1750 Bar, 2 hours of HIP treatment for Inconel 713 LC superalloy was optimum. It can improve the microstructure and tensile properties of Inconel 713 superalloy castings. Through the optimum HIP treatment the segregated structure is improved.

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