The Cu5MCuC Inconel casting produced by pouring into a sand mold seems to have developed several hot tears/hot cracks. The cracks opened up after heat treatment. How the tears/cracks could be avoided in the casting?
Article Hot Tearing in Steels During Solidification: Experimental Ch...
https://etd.ohiolink.edu/!etd.send_file?accession=osu1420733310&disposition=inline
https://www.osti.gov/servlets/purl/1348325
https://www.twi-global.com/technical-knowledge/job-knowledge/defects-solidification-cracking-044
Abdulaziz Albannai Thank you for replying,
But, we are facing this problem specifically for this alloy alone. Not in any steel grades, or other Inconel grades (with less Fe). Design of mold and chills are based on the results of high end simulation software. There must be something related to the metallurgy of the alloy that, hot crack appears in this particular alloy alone.
it was suggested that adding 4 main elements (Ti, Si, Al, & Mn) could increase the surface free energy by the reduction of dissolved O, thereby decreasing cracking tendencies. (from the link below)
http://files.aws.org/wj/supplement/WJ_1977_08_s245.pdf
This and other nickel alloys are very sensitive to hot cracking for a couple of reasons. One is impurity levels (P, S, certain other elements), another grain size, but many more. If you go to our website https://inquiries.nickelinstitute.org/ and give some more details, that would be helpful. A micrograph of the cracks would be especially useful. It is free of charge. We have a nickel alloy casting consultant with many years of practical experience that should be able to help.
Gary Coates Thank you for the valuable suggestion. I am going through the site.
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