Improvement Incoloy Alloy 800 Weldability After 10 Years of Service through Solution Annealing and Normalizing Method

Abstract

Incoloy Alloy 800 is widely utilized in the Outlet Manifold Bottom Header (OMBH) inside the primary reformer at a fertilizer plant. Primary reformers in fertilizer plants usually work at high temperatures and pressures for long periods. In this work, Solution annealing and normalizing method were conducted to improve weldability Incoloy alloy 800 after operating for ten years. Characterization of weldability properties is carried out through dye penetrant, X-ray Fluorescence, hardness, X-Ray Diffraction (XRD), 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.