Changes in microstructure of HP-modified, heat-resisting cast alloys under long-term aging. Repair weld cracking of service-exposed, HP-modified, heat-resisting cast alloys (2nd Report)

A detailed investigation into the microstructural changes in HP-modified, heat-resisting cast alloys under long-term aging, clarifying differences in microconstituents and microconstituent behavior was described. In addition, the morphology of individual microstructures depending on the types and contents of alloying elements was described as well. As such, the alloys were aged under conditions involving the cast alloys being treated at 1323 K×3.6-36000 ksec to investigate changes in the microstructure of the sample steel base metals.