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Report No.

Microstructure and high-temperature strength of high Cr ODS tempered martensitic steels

Otsuka, Satoshi   ; Kaito, Takeji ; Tanno, Takashi  ; Yano, Yasuhide  ; Koyama, Shinichi  ; Tanaka, Kenya

The manufacturing tests of 11-12Cr ODS tempered martensitic steels were carried out, and their ferritic/martensitic duplex structures were quantitatively evaluated by three types of methods, i.e. high temperature XRD, EPMA and metallography. It was demonstrated that excessive formation of residual-alpha ferrite provided by increasing Cr can be suppressed by appropriately controlling the concentration of ferrite-forming element and austenite-forming element on the basis of the parameter "chemical driving force of $$alpha$$ to $$gamma$$ reverse transformation" as a useful indication. The 11Cr-ODS steel containing a small portion of residual-alpha ferrite was successfully manufactured. In the as-received condition, this 11Cr-ODS steel is shown to have the satisfactory creep strength and ductility as high as the 9Cr-ODS steel while 0.2% proof strength at 973K is lower than in the 9Cr-ODS steel.



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Category:Materials Science, Multidisciplinary



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