W对Fe-Ni因瓦合金性能的影响

Effects of W on the performance of Fe-Ni Invar alloy

以具有细化晶粒作用的顺磁性W元素对Fe-Ni因瓦合金4J36进行合金化,制取具有低膨胀系数、高强度的膨胀合金,实验通过熔炼、锻打成型及热处理等试样制备工艺,在化学分析、金相和电镜扫描、晶粒度、显微硬度以及膨胀系数检测基础上,依据磁致伸缩理论和金属强化理论分析性能提升的机理。结果表明,W合金化后基体的膨胀系数符合标准的要求,并且提高了基体强度。

The element W has the properties of paramagnetic and grain refinement ability.The Expansion alloy has a low coefficient of thermal expansion（CTE） and high strength was made by W of Fe-Ni Invar alloy.The sample was prepared by melting,forging and heat treatment.On the basis of chemical analysis,metallographic and scanning electron microscopy,grain size,microhardness and CTE testing.The mechanism of performance improvement was analyzed according to the theory of magnetostrictive and metal strengthening.The result shows： the strength of matrix is improved by W alloying and the CTE is lower than that of the criteria required.