Abstract
It has long been recognized that Curie point of cementite (Fe3C) changes due to containing special elements in solid-solution, but little work has been done on the quantitative investigation of this problem. In the present studies, thermo-magnetic experiments were carried out on cementites isolated from various alloyed steels, and the following results were obtained: (1) Curie pt. of cementite (A0) and the concentration of the third elements (〈M〉%) in it are related as A0(°C)=215+p〈M〉, where p is determined as follows: Co; 8.7, Ni; 3.7, Cr; −16, Mo; −16, W; −19, Mn; −24, V; −57. (2) The descent of A0 pt. due to dissolving of Mo, W, V and Ti halts at 186°, 191°, 181° and 213°, respectively. From this results, it is concluded that the solvilites of these elements into cementite are restricted within 1.8%Mo, 1.3%W, 0.6%V and 0.1%Ti (at 700°). (3) Si, Al, S and P slightly lower the A0 pt. This fact may be taken to prove the possivility of dissolution of these elements into cementite.
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