Effect of the Volume Energy Density and Heat Treatment on the Defect, Microstructure, and Hardness of L-PBF Inconel 625
- PDF / 4,188,663 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 44 Downloads / 193 Views
UCTION
ADDITIVE manufacturing (AM) is a rapidly growing industry that enables the production of complex and lightweight products without requiring any tooling.[1,2] The laser powder bed fusion (L-PBF) process is one of the most common AM methods in which the near-netshape product is built layer by layer using the powder material from a CAD model.[3] With the recent advancements in AM-based processes, several alloys have been developed to make the fabrication of high-value components through AM processes feasible. Among them, nickel-based superalloys have gained more attention because of their high price and special applications in high-temperature conditions such as gas turbines.[4,5] Inconel 625 (IN625) is a weldable nickel-based superalloy that is well known for its excellent corrosion and fatigue resistance.[6] The high strength of IN625 is due to the solid-solution hardening effect of niobium (Nb) and molybdenum (Mo) that exists within the Ni-Cr matrix.[7] Casting and forging are the most popular methods for
H.R. JAVIDRAD is with the Department of Mechanical Engineering, Iran University of Science and Technology, Tehran 16557, Iran. Contact e-mail: [email protected] SINA SALEMI is with the Division of Mechanical Engineering, Niroo Research Institute, Tehran 14686, Iran. Manuscript submitted April 25, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS A
the fabrication of parts of nickel-based superalloys[8]; however, the conventional manufacturing processes require complex tooling, and controlling the quality and performance of the products is also challenging. Thus, AM technology, with its novel facilities, has become attractive for the fabrication of these superalloys.[9] Although AM methods have resolved many of the problems encountered in conventional manufacturing of nickel-based superalloy products, new problems such as fabricating fully dense products, dealing with non-equilibrium phase formation, and achieving desirable mechanical properties have arisen.[10,11] In fact, several factors contribute to the mass density rate and mechanical properties of the final product, making precise adjustment and design of the manufacturing process very challenging.[12] To identify the impacts of the process parameters on the mechanical properties and mass density of the AM products, many research works have been conducted in the research community.[13–19] Gonzalez et al.[4] carried out a comparative study on the powder bed AM methods of fabricating IN625. They specified that the L-PBF is the only AM method with the capability of producing near-wrought material properties. Amirjan et al.[15] studied the effect of scanning strategy on the quality and mechanical properties of the selective laser melted (SLM) Inconel 718 specimens. Their results depicted that by increasing the scan speed in any given scan strategy, the mass density decreased. They also added that the island scanning
strategy with a 90-deg interlayer rotation yields the highest mass density (i.e., 8.20 g/cm3). Sateesh et al.[13] found that an increa
Data Loading...
