Wear tests of materials for FBR in sodium environment(III); Metallographic tests of hard metals and carbides

Kano, Shigeki; Mizobuchi, Shotaro*; Namekawa, Masaru; Nakayama, Koichi; not registered; Atsumo, Hideo

It is desirable for the wear-resistance of material to be evaluated from the metallographic data of sliding surface as well as the fiction coefficient and the specific wear rate Ws. We mainly showed the results of metallographic analysis of materials desclibed in the preceding report. Also, we showed the friction coefficients, the wear rates and the results of metallographic analysis of material combinations tested in the first half of 1974. The tests yielded the following results: (1)The combinations of LC-1C vs. LC-1C and LW-1N40 vs. LW-1N40 showed the highest kinetic friction coefficient k(0.6) of all combination tested, but did not show any deformation and structural change except for LW-1N40(G/F) vs. LW-1N40(G/F). LW-1N40(G/F) cracked under the grinder finish of coating surface and then the fluctuation of friction coefficient became greater. (2)The combinations or Stellite No.6 vs. Stellite No.6, Colmonoy No.5 vs. Colmonoy No.6, and Deloro Stellite SF-60M vs. Colmonoy No.6 showed the lowest k(=0.3) and Ws(0) of all combinations tested. Moreover, these sliding surface layers were stable without any structural change. (3)SUS304 tended to make the static friction coefficient s higher and the combination of SUS 304 vs. SUS304 showed the highest s(=0.6) of all combinations tested. Also, this easily raised the plastic deformation and this sliding surface was considerably rough. (4)Inconel X750 and LW-5 considerably showed the plastic deformation and the structural shange on these sliding surface layers. The combination of Inconel X750 vs. Inconel X750 showed the highest Ws of all the combinations tested.