i think homogenize of it should be 2 or more steps after product it ingot. i can't find homogenize temperature and cycle of haynes 188 in literature.
I'm not sure what you mean by "or cycle" but Haynes 188 (Co-Cr-Ni-W) is generally furnished in the solution heat-treated condition. The alloy is normally solution heat treated at 1175 C and rapidly cooled. If annealed at lower than 1175 C some carbides will precipitate.
Larry Eiselstein has correctly given the solutionizing temperature as 1175 C. I agree with him about the carbide precipitation problem if solutionized at lower temperatures. 1175 C is the right temperature for solutionizing as the melting range of this alloy is 1315-1410 C. Incidentally Haynes International have come out with Haynes 230 as the newer version of Haynes 188. Please see attachment about this.
thank you dear Malur Srinivasan, yes i know haynes 188 is update of haynes 25 (L-605) for problem of Laves phase (TCP) and Haynes 230 (Nickle base) is update of haynes 188, but i want see if we produces ingot of Haynes 188 (VIM/other method) is it essential homogenizing process?
in addition i need understand microstructure of Haynes 188 and distinguish Carbide type to on other (E.G. M23C6 ,M7C3 or M6C) if we observe it with optical microscopy. i will send pic of our observation of it
I saw in the picture in a follow-up question of yours. Then I googled and found that the grain boundary precipitate is M23C6 and the one in the grain is M6C. The reference is Heat treater's guide: Practices and procedures for nonferrous alloys, book edited by Chandler. I found this by googling with "microstructure of Haynes 188". You can easily access this. My sincere suggestion is that you study this book.
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