本文選題：M高速鋼　切入點：碳化物　出處：《鋼鐵》2017年07期

【摘要】：通過X射線衍射分析、光學顯微鏡和透射式電子顯微鏡觀察以及相關熱力學計算,對比研究了M42高速鋼電渣錠及鍛后退火兩種狀態(tài)所析出碳化物的類型、尺寸、分布及析出條件。得出M42高速鋼電渣錠中的碳化物主要為Mo_2C亞穩(wěn)態(tài)碳化物和少量Cr_7C_3碳化物,Mo_2C碳化物尺寸較大,主要呈層片狀、纖維狀和棒狀沿晶界析出。鍛造退火后的M42高速鋼中碳化物類型主要為Cr_7C_3,VC和Fe_2Mo_4C,平均尺寸小于10μm且分布均勻,形態(tài)以方形、不規(guī)則球形和小顆粒為主。M42高速鋼電渣錠中的Mo_2C在鍛造過程中可以分解為Fe_2Mo_4C和VC。根據(jù)冶金熱力學計算得出,Mo_2C和VC在固液兩相區(qū)析出,析出溫度分別為1 229和1 222℃;Cr_7C_3在固相中析出,析出溫度為842℃。
[Abstract]:The type and size of carbides precipitated from M42 high speed steel electroslag ingot and annealed after forging were studied by means of X-ray diffraction, optical microscope and transmission electron microscope and thermodynamic calculation. The results show that the carbides in M42 high speed steel electroslag ingots are mainly Mo_2C metastable carbides and a small amount of Cr_7C_3 carbides. The carbides in M42 high speed steel after forging annealing are mainly Cr7C3C and Fe2Mo4C.The average size is less than 10 渭 m and the distribution is even, and the shape is square. The Mo_2C in the electroslag ingot of irregular sphere and small particle can be decomposed into Fe_2Mo_4C and VC in the forging process. According to the calculation of metallurgical thermodynamics, the precipitation of Mo2C and VC in the solid-liquid two-phase region is obtained. The precipitation temperatures are 1 229 and 1 222 鈩，

本文編號：1671730