0.1C-9Cr-3W-3Co鋼におけるマルテンサイトの加熱過程に及ぼすボロン添加の影響

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The effects of boron addition on the heating processes of martensite in 0.1C-9Cr-3W-3Co steels have been studied. The steels with and without lOOppm boron were prepared. The specimens were austenitized at 1200℃ for 1.2 ks, and quenched into iced brine, resulting in formation of α' martensite laths. They were heated up to 1000℃ at a rate of l10℃/min. Temperature derivative of electric resistivity, dp/dT, decreased gradually around 500℃, increased slightly around 750℃, decreased around 810℃ and largely decreased around 870℃ in both steels. Observations by transmission electron microscopy revealed that the reactions were related to the formation of M_7C_3, dissolution of both cementite and M_7C_3, the precipitation of M_<23>C_6 and the austenite formation, respectively. The boron addition promotes M_<23>C_6 formation and retards the α→γ transformation.
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