ほう化層生成におよぼす鋼中のC, Si, Mnの影響について

抄録

The effect of carbon, silicon and manganese on the formation of a boride layer and its properties was studied. The used materials were iron alloys containing 0.25∼1% carbon, 0.5∼5% silicon or 0.5∼5% manganese. The experimental results were as follows:
(1) The formation of the boride layer in Fe-C and Fe-Si alloys was impeded as the addition of carbon or silicon was larger, but the addition of manganese had no effect in Fe-Mn alloy.
(2) From the results of X-ray diffraction it was observed that the diffuse-coated layers of all specimens consisted of two layers of FeB and Fe₂B independently of alloying elements.
(3) The carbon and the silicon in Fe-C or Fe-Si alloy was diffused to the center of the specimen with the growth of the boride layer. Consequently, it was found that in hyper eutectoid steel a cementite precipitated and in Fe-Si alloy silicon made a solid solution with iron containing a large quantity of silicon between the boride layer and the matrix.
(4) From the analysis by an electron microprobe X-ray analyzer the existence of manganese was observed in the boride layer of Fe-Mn alloy.