Al含量对HK40合金显微组织的影响
Effect of Aluminum Content on Microstructure of HK40 Alloy
邢琳琳, 郑雁军, 杨雯雯, 崔立山
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作者单位：(中国石油大学(北京) 材料科学与工程系, 北京 102249)
中文关键字：HK40合金； AlNiFe； Cr7C3； γ-Fe； 析出相
英文关键字：HK40 alloy; AlNiFe; Cr7C3; γ-Fe; precipitate phase
中文摘要：研究了Al含量对HK40合金微观组织的影响，采用OLYMPUS金相显微镜观察金相组织，并利用FEI Quanta200型扫描电镜观察背散射电子衍射图像，结合XD-3A 型X射线衍射仪对合金进行物相分析。 结果表明，在含2wt%Al的HK40合金中，Al元素全部固溶于基体中，未形成沉淀相，显微组织为奥氏体 + 碳化物；当Al含量为4wt%时，合金中出现了大量的树枝相AlNi、Fe2Al5，基体相仍然为γ-Fe固溶体；当Al含量增加到6wt%时，基体相转变成以α-Fe为主，同时有大量AlNi金属间化合物析出。
英文摘要：The effects of aluminum content on the microstructure of HK40 alloy were studied by optical microscope. The distribution of elements in matrix was analyzed by electron probe microanalysis (EPMA-1600). The phases were confirmed by X-ray diffraction. The results show that Al element are all dissolved in the matrix of HK40 alloy when Al concent is below 2wt%Al, and no precipitates form. The microstructure of the alloy is austenite+carbide, which is the same as HK40 alloy. When Al concent is 4wt% or higher, a lot of AlNi, Fe2Al5 dendrite phase appear in the alloy and the matrix is γ-Fe solution. When aluminum content in steel increase to 6wt%, the matrix of the alloy transforms into α-Fe based, and a large number of AlNi metallic compounds exists in the matrix.