Ground Surface Layer in α・Fe-Fe_3 C alloys

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This paper describes basic and systematic estimation for the residual stress, hardness and structure of the ground surface layer of α・Fe-Fe_3C alloys with volume fraction of cementites ranging from 1.0 to 14.1%. Furthermore, we also investigated the relation of the residual stress, hardness and structure in surface layer and grindability factors. The main results obtained are as follows; 1) The residual stress of Fe_3C phase in ground surface layer is measured by a trial-made X-ray strain meter. 2) The residual stress ratio in the two phases σ_<ic>(Fe_3C)/σ_<iF>(σ・Fe)=4〜5 is obtained in the case of 10% Fe_3C or more. 3) With an increase in the grain size of Fe_3C (d^^-_0) and Fe (d^^-) crystals, the fluctuating and depth values of residual stress distribution increase gradually. Furthermore, the residual stress of the lamellar cementite is larger as a whole when it is compared with that of the spheroidal cementite.
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