Material-technological conversion of nickel alloys. Part 2. Technological problems of the casting process

The aim of the second part of the study was to make utility castings of refractory nickel alloys, traditionally processed plastically, intended for use in extremely difficult conditions. The related technological problems and obtained effects were discussed, both in terms of the properties of cast alloys and the quality of the castings obtained. Inconel 740 (IN740) and Haynes 282 (H282) alloys were the subject of research, which so far have been used only as plastically processed alloys. Attempts were made to melt them in an open induction furnace and gravity casting. It has been shown that mechanical properties of such alloys are comparable at high temperature and even exceed those of their counterparts processed plastically. It has been confirmed that with a well-developed technological regime it is possible to produce from these alloys of good quality castings intended for operation at temperatures significantly exceeding 760°C.

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