A dataset of effect of long-term thermal exposure on microstructure of laser welded UNS N10003 alloy

Data DescriptionThe dataset associated with this study provides detailed information on the microstructure evolution and tensile rupture mechanism of laser-welded UNS N10003 alloy under long-term thermal exposure at 700°C. The data generation procedures included the preparation of UNS N10003 alloy plates, laser welding using an IPG YLS-10000 fiber laser, and subsequent thermal exposure in a furnace for varying durations up to 10,000 hours. Microstructural analyses were conducted using optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM).Data Generation Procedures:Materials and Preparation: UNS N10003 alloy plates were sectioned into smaller plates (300 mm × 100 mm × 4 mm) and underwent surface preparation via sandblasting and acetone cleaning.Welding Process: Laser welding was performed with parameters optimized based on radiographic testing. The laser beam was focused to a 0.26 μm diameter spot and guided by a KUKA robot.Thermal Exposure: Specimens were exposed at 700°C for various time intervals up to 10,000 hours and subsequently air-cooled.Data Processing Methods:Microstructural Analysis: Cross-sections of welded joints were mounted, ground, and polished for OM, SEM, and EBSD observations. TEM specimens were prepared and analyzed to identify precipitate structures.Tensile Testing: Tensile properties of the welded joints were tested at 700°C using a Zwick/Roell Z100 universal material machine.Temporal and Geographical Scopes:The dataset spans thermal exposure durations from immediate post-welding up to 10,000 hours.The research was conducted at the Shanghai Institute of Applied Physics, Chinese Academy of Sciences, and the Nuclear and Radiation Safety Center, China.Data Characteristics: