【摘要】 研究了铝热 -离心法制备的铁镍基合金内衬复合钢管的组织结构 ,分析了内衬层沿径向的成分分布。结果表明 ,铁镍合金由奥氏体和铁素体两相组成。铁镍合金内衬层与碳钢基体之间形成了一个宽约2 0 μm的马氏体过渡区。内衬层的成分呈梯度变化 ,合金元素的含量沿径向由内表面到外表面逐渐降低。铝热 -离心法制备的铁镍基合金铝含量较高 ,在内衬层内表面附近铝含量约为 5 %。更多还原

【Abstract】 The microstructure of the iron-nickel alloy lined layer in a composite pipe produced by centrifugal-thermit process was investigated The radial composition distribution of the alloying elements in the lined layer was analyzed The results show that the iron-nickel alloy was composes of austenite and ferrite A martensitic transition region ca. 20μm in width was formed between the iron-nickel layer and carbon steel substrate A concentration gradient of alloying elements was shown in the iron-nickel alloy in the direction of the radius of the composite pipe The alloying element contents of the lined layer were higher near the inner surface than near the outside surface in contact with the carbon steel substrate For example,the aluminum content was ca. 5% near the inner surface更多还原