【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显微结构,分析了内衬层沿径向的成分分布。结果表明,铁镍合金内衬层与碳钢基体之间形成了一个宽约20μm的马氏体过渡区。内衬层合金元素的含量沿径向由内表面到外表面逐渐降低。铁镍合金铁素体区内有细小的AlNi3和AlNi析出物。更多还原

【Abstract】 The microstructure and composition distribution of the iron-nickel alloy lined layer in a composite steel pipe produced by centrifugal-SHS process were invest igated. The results showed that a martensitic transition region has been found b etween the iron-nickel layer and carbon steel matrix. A composition gradient of alloying elements exists in the iron-nickel alloy layer in the radial directio n of the composite pipe. The alloying element contents in the lined layer are hi gher near the inner surface than near the outside surface. The intermetallic com pounds AlNi3 and AlNi precipitate in the iron-nickel alloy.更多还原