Effects of some carbide stabilizing elements on creep-rupture strength and microstructural changes of 18-10 austenitic steel |
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Authors: | Takayuki Shinoda Tomoyuki Ishii Ryohei Tanaka Tohru Mimino Kazuhisa Kinoshita Isao Minegishi |
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Affiliation: | (1) Metallurgical Engineering Department, Tokyo Institute of Technology, Tokyo, Japan;(2) Technical Research Center, Nippon Kokan K. K., Kawasaki-City, Japan |
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Abstract: | The creep rupture test has been carried out for 18Cr-10Ni-0.1 wt pct C stainless steels bearing individually Ti, Nb(Cb), and
V, followed by the microstructural study. The highest value of 700°C-104 h rupture strength in a titanium and niobium series (the steel containing various amounts of titanium and niobium, respectively)
has been obtained at Ti/C and Nb/C atomic ratio of 0.8 and 0.2 to 0.4, respectively. On the other hand, in a vanadium series,
the creep rupture strength of the steel showed its maximum at V/C atomic ratio of about unity in the testing at the temperature
of 700° and 800°C, but at 600°C, the strength increases monotonically with vanadium content up to 1.53 wt pct. Such high strength
in the steels con-taining proper amount of Ti, Nb, and V is related mainly with the fine distribution of M23C6 precipitates which is caused by the acceleration of nucleation due to the foregoing precipi-tation of a MC type carbide within
the austenite grains. And it has been deduced that the solid solution strengthening effect of the vanadium contributes also
to the remarkable in-crease in the rupture strength of the vanadium steel at 600°C. |
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