Improvement Incoloy Alloy 800 Weldability After 10 Years of Service through Solution Annealing and Normalizing Method
Incoloy Alloy 800 is utilized in the Outlet manifold bottom header (OMBH) inside the primary reformer at a fertilizer plant. OMBH was serviced at high temperatures and pressures for ten years in this work. Solution annealing and normalizing method were conducted to improve weldability Incoloy alloy 800. The analysis was carried out by the series of tests, including dye penetrant testing, XRF testing, weldability testing, hardness testing, XRD testing, and metallography observation. The annealing and normalizing result show that the weldability of Incoloy Alloy 800 increased, indicating a significant reduction in cracks on the weld zone surface. Microstructure observations revealed that microcrack was not found on the weld joint surface after Solution annealing. The maximum hardness value on the fusion zone was obtained at 187 VHN on normalizing, and minimum hardness was obtained on the nontreatment sample 156.33 VHN.