Inconel 625 alloy resists corrosion, fatigue and wear at elevated temperatures and hence they are used in aerospace, chemical, petrochemical, marine, and other high-temperature applications. In the present study, single beads of Inconel 625 were deposited using the cold metal transfer (CMT) based wire arc deposition process. Seven heat input conditions were used to study the microstructure and mechanical characteristics. Microstructural characterization was done with optical and scanning electron microscopes while microhardness was measured using the Vickers microhardness testing method. It has been observed that the microstructure of the deposited beads consists of a columnar structure with primary dendrites. Also, intermetallic elements like Niobium (Nb), Molybdenum (Mo), and Laves were formed. It was also observed that the percentage of Nb and Mo increases with heat input. The microhardness increases with an increase in heat input and the maximum hardness was found to be 234.7 HV.

Inconel 625合金可抵抗高温下的腐蚀，疲劳和磨损，因此可用于航空航天，化学，石化，海洋和其他高温应用。在本研究中，使用基于冷金属转移（CMT）的电弧沉积工艺沉积了Inconel 625的单个焊珠。七个热输入条件用于研究组织和力学性能。用光学和扫描电子显微镜进行显微结构表征，同时使用维氏显微硬度测试方法测量显微硬度。已经观察到，所沉积的珠的微观结构由具有初级树枝状晶体的柱状结构组成。此外，形成了金属间元素，如铌（Nb），钼（Mo）和Laves。还观察到，Nb和Mo的百分比随着热输入而增加。显微硬度随热量输入的增加而增加，发现最大硬度为234.7 HV。