Скачать или смотреть Strengthening Inconel 625: The Impact of Multiple Thermal Cycling in High-Speed Laser Cladding

In this video, we dive deep into the fascinating metallurgical transformations of Inconel 625 during the high-speed laser cladding process. While repeated heating is often seen as a challenge in additive manufacturing, research shows that multiple thermal cycling is a powerful mechanism for enhancing material properties, specifically increasing microhardness from 230 HV0.2 to 320 HV0.2.
We explore how a serpentine cladding trajectory on a Q245R steel substrate creates a complex thermal history, where peak temperatures drop from 1900 °C in the first cycle to below 500 °C by the sixth cycle. This transition in temperature is the key to a multi-stage strengthening process.
Key Topics Covered:
• The Hardness Leap: Why microhardness stabilizes at a higher value after eight to ten cycles.
• Microstructural Evolution: How columnar crystals coarsen and precipitates like MC and Laves phases form a network structure during the first six cycles.
• The Dislocation Paradox: Why dislocation density and Low Angle Grain Boundaries (LAGBs) initially decrease due to high-temperature recrystallization before proliferating during later, lower-temperature cycles .
• Elemental Diffusion: The role of Iron (Fe) and Carbon (C) diffusing from the substrate to enhance solid solution strengthening and facilitate dislocation formation.
• Numerical Simulation: How 3D-Gaussian body heat source models are used to predict the temperature field and its impact on grain orientation.
Strengthening Mechanisms Breakdown:
1. Cycles 1–4: Dominated by precipitation strengthening (MC phase formation) and solid solution strengthening from substrate elements.
2. After Cycle 6: Dislocation strengthening becomes the primary driver of hardness as dislocations entangle and form new LAGBs.
This research provides a critical basis for controlling the microstructure and optimizing the performance of high-speed laser-cladded coatings in demanding industries like aerospace and petrochemicals.
Read the Full Study: This video is based on the paper: "Effect of multiple thermal cycling on the microstructure and microhardness of Inconel 625 by high-speed laser cladding" published in the Journal of Materials Research and Technology.
#MaterialsScience #Inconel625 #LaserCladding #Metallurgy #AdditiveManufacturing #Engineering #SurfaceTech #Microhardness #ThermalCycling #STEM