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40CrNiAl合金是抗H2S腐蚀的仪表用轴承合金,通过相分析,确定合金中主要含σ-Cr及γ’-Ni8(Al、Cr)两种强化相；建立了定量电解提取及分离、分析的方法；测出了这两种相的含量及组成随热处理的变化。利用恒电位浸蚀技术用金相显微镜及透射电子显微镜观察了析出相的形貌、分布及大小,弄清主要强化相为650-750℃时效处理期间,析出大量弥散细小的γ’相。在800℃过时效,则γ’相当严重地聚集长大,析出量增多(α相的数量不变化),强化效果下降。
40CrNiAl alloy is a kind of bearing alloy for instrument of resistance to H2S corrosion. Through the phase analysis, the two kinds of strengthening phases containing σ-Cr and γ’-Ni8 (Al, Cr) are determined. The method of quantitative electrolytic extraction and separation and analysis The content and composition of these two phases were measured as a function of heat treatment. The morphology, distribution and size of precipitated phases were observed by metallographic microscope and transmission electron microscope using potentiostatic etching technique. It was found that a large number of finely dispersed γ ’phases were precipitated during the aging treatment at 650-750 ℃. After aging at 800 ° C, γ ’aggregates and grows considerably seriously, increasing the amount of precipitation (the number of α phases does not change) and the strengthening effect decreases.