本课题就是在铁基和镍基的等离子弧堆焊过程中引入纵向直流磁场，利用磁场的作用提高堆焊层的性能。
This paper is about the effect of introducing longitudinal magnetic field on plasma overlaying of Fe-based and Ni-based welding alloy.
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。
The microstructure and composition distribution of the iron-nickel alloy lined layer in a composite steel pipe produced by centrifugal-SHS process were investigated.
试验结果显示：铁、镍、钼元素分布变化不大。熔合线堆焊层侧增碳层宽度增加，氢致剥离的倾向也增大。
The results show that there are little changes in the distribution of Fe, Ni and mo, the increase of the width of carburized zone will promote the tendency of hydrogen-induced disbonding.
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