Common internal defects in metal additively manufactured parts include pores, lack-of-fusion defects, and localized microstructural nonuniformity. HIP can significantly reduce internal porosity, but it does not replace every post-processing step. A complete release pathway commonly includes support removal, heat treatment, machining, surface finishing, cleaning, CT or metallographic inspection, and batch-data archiving.
The HIP process window for a AM part needs to take into account the material grade, printing process, powder batch, defect type, target performance and standard requirements. Titanium alloys, nickel-based alloys, stainless steel and cobalt-chromium alloys have different pressure-temperature combinations, and the subsequent solid solution, aging or controlled cooling paths are also different. For aerospace and medical applications, process curves, heat records, inspection reports and equipment calibration records are often as important as part performance.
When selecting equipment, you should consider the maximum part size, furnace loading method, target batch cycle, cooling strategy, data traceability, FAT/SAT and customer quality system interface, rather than just comparing the appearance of the equipment and nominal limit parameters.