研究了含4％Co的M42基体钢在250—700℃回火区间的析出相低温回火有M_3C(M以Fe为主)碳化物析出,400℃以上回火,数量逐渐减少.500—560℃观察到一个衍射芒线的演化过程.在580℃回火时观察到面心立方M_2C(M以Mo为主),700℃时面心立方M_2C全部转变成六方M_2C,还有VC和Cr_(23)C_6。 衍射芒线是由于合金元素Mo,W与碳元素在{100}_(α′)面上的偏聚造成的,是由复合偏聚区向过渡相(面心立方M_2C)的演变.这一演变使M42基体钢回火出现二次硬化现象。
The precipitate phases of M42 matrix high speed steel, containing 4%Co, tempered in temperature range of 250 to 700℃ have been investigated. M_3C precipitate, mainly Fe_3C, occurs in the steel tempered at lower temperature, and lessens gradually over 400℃. Changing of diffracted streaks and fcc M_2C, mainly Mo_2C, are observed after tempered at 500 —560℃ and 580℃ respectively. When tempering temperature up to 700℃, all fcc M_2C transforms into hcp M_2C, and also VC, Cr_(23)C_6. The diffracted streaks are believed to be due to the segregation of alloying elements Mo and W together with C on {100}_α′,, and the change from mix-cluster to transition phase fcc M_2C, which results in secondary hardening of M42 matrix steel after tempering.
参考文献
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