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*; *; Koakutsu, Toru; *; *
PNC TN9410 89-148, 158 Pages, 1989/10
For the purpose of the verification of the evaluation method on the sodium environmental effect on the mechanical properties of the structural materials used for the prototype LMFBR "MONJU" and the rationalization of the evaluation method for large scale LMFBRs, SUS 304 and 316 austenitic stainless steels and 2.25Cr-1Mo steel (NT) were carried out. Test specimens were exposed to a sodium loop for 10,000 hours at 400 
600
C simulating the primary and secondary coolant systems of the prototype LMFBR "MONJU". After the exposure, fatigue tests were performed in sodium environment. Fatigue tests were also performed on the thermal aged material for 10.000 hours in inert gas. The results obtaind were as follows. (1)The difference between the fatigue lives of sodium exposed materials and thermal aged materials was very small for both kinds of steels and these lives were almost the same as these of as - received materials. (2)Caburization was recognized on the surface of SUS 304 and SUS 316 austenitic stainless steels in the cage tested in sodium after sodium exposed. In the case of 2.25Cr-1Mo steel (NT), some decarburization was observed at 500 C. (3)The fatigue lives didnot depend on the exposure history such as sodium exposed materials and thermal aged materials for 10,000 hours. The carburization and decarburization effects were very small on fatigue life. The fatigue lives were affected by the environment in which fatigue tests are conducted.
*; *; *; *
PNC TN941 85-128, 70 Pages, 1985/09
High temperature tensile tests were performed on SUS304, SUS321 and 2.25Cr-1MO Steel to verify the tensile properties of Materials Strength Standard for Monju. Tensile tests were also performed at ultra-high temperatures (up to 900C) on SUS304 and SUS321 steel plates and SUS321 steel forging. Evaluation of high temperature and high strain rate tensile properties which simulate the tensile condition of sodium-water reaction was made. Major results obtained are as follows: (1)Tensile properties of SUS 304, SUS321 and 2.25Cr-1Mo steel below 650C. (i)Tensile strength and 0.2% proof strength did not fall below the design tensile strength and design yield strength respectivety. (ii)Fracture elongation and reduction of area agreed well with those of references, and showed satisfactory values. (iii)Elasto-plastic paramaters were almost comparable with those for Monju design. This proves the validity of Elasto-plastic parameters for Monju. (2)Tensile properties of SUS304 steel plate, SUS 321 steel plate and forging at 650900C. (i)Tensile properties data (tensile strength, 0.2% proof strength, fracture elongation and reduction of area) were obtained up to 900C at strain rates of 1 and 10%/min. (ii)Fracture elongation and reduction of area of these steels were high enough, and improved as the strain rate increased. (iii)An attempt to evaluate the effect of strain rate on tensile strength was made. Applying this to the ultra-high temperature data at 110%/min, tensile strength under JIS high temperature test condition was estimated.
Hirano, Masaatsu; Kohashi, Kazuyuki*; Yuhara, Shinichi*; Nakasuji, Takashi; Atsumo, Hideo
PNC TN951 77-03, 35 Pages, 1977/08
Strain controlled fatigue tests with triangular waveform in sodium and in air at 550
were conducted by use of the fatigue test facilities in sodium for the purpose of establishing the fatigue testing technique and clarifying the fatigue behavior in sodium. The results obtained are summarized as follows. The fatigue test technique in high temperature sodium involving the calibration method of the elongation of a specimen and push-pull rod was established. The fatigue life of SUS304 stainless steel in sodium at 550 was longer than that in air at the same temperature, at the same strain rate of 1
10
sec
and that of ASME fatigue design curve. Particularly, this tendency was larger as the strain range become lower.
*; Kano, Shigeki; Koakutsu, Toru; *; *; Atsumo, Hideo
PNC TN965 73-03, 130 Pages, 1973/09
We constructed Medium purity material test loop in March, 1972. In this report, we described the basic conceptional design, the outline, the operation mode, the constraction history and the test run about the loop. In the end of this report, we piked up the future problems gaiued by our works.
