Fe-Cr-Mn-CとFe-Cr-Ni-Mn-C系合金の飽和磁化に及ぼす焼入れ温度と化学組成の影響(相変態・材料組織)

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Quenching temperature dependences of saturation magnetization, J(T), were investigated in five Fe-^mass%Cr-2.0mass%Mn-7mass%C (X=1.97-9.92, Y=0.89-0.61) alloys and four Fe-6.0mass%Cr-Zmass%Ni-2.0mass%Mn-0.75mass%C (Z=1.04-3.02) alloys in order to elucidate the correlation between magnetic properties and microstructures as well as to develop an alloy exhibiting both ferromagnetism after heat treatment at lower temperatures and feeble magnetism after quenching from higher temperatures. The starting materials, consisting of ferromagnetic α (or α') and carbide phases, were prepared by heating at 1053K and the following slow cooling. They all exhibited high J values of 1.57-1.75 T. The J values of the alloys decreased by quenching from higher temperatures between 1073 and 1423K, and decreased with increasing quenching temperature. Especially, the J values began to decrease at lower quenching temperature in Fe-Cr-Mn-C alloys with lower chromium and higher carbon content, and in Fe-Cr-Ni-Mn-C alloys with higher nickel content. These behaviors were closely related to the quenching temperature dependences of the paramagnetic retained austenite content, γ_R(%). That is to say, the γ_R began to increase at lower quenching temperature in these alloys. In the lower chromium and higher carbon content alloys, the carbide particles dissolved at relatively low temperatures. Therefore, the decrease in martensite start temperature, M_5, started from the lower quenching temperature. On the other hand, in the higher nickel content alloys, the dissolution degree of the carbide particles was almost independent of the nickel content. However, the M_5 decreased because of the high nickel concentration in γ phase.
社団法人日本鉄鋼協会の論文
2004-05-01

Fe-Cr-Mn-CとFe-Cr-Ni-Mn-C系合金の飽和磁化に及ぼす焼入れ温度と化学組成の影響(相変態・材料組織)

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