时效处理对Ni－Cr－Al－Ce高硬弹合金组织和性能的影响

Ageing Effect on Structures and Properties of Ni-Cr-Al-Ce Hard Elastic Alloys

在Ｎｉ－Ｃｒ合金中加入３％ａｌ形成弥散硬化型的高硬弹台金．试验结果表明时效温度５５０℃，５ｈ时进行分级时效能获得８０％质量百分数的过饱和宫Ｃｒ（α）相比配制成分高４０％Ｃｒ．并且测定析出富Ｃｒ（ａ）相颗粒的平均直径Ｄ为１．４６８５ｍｍ，颗粒的总面积占测绘面积的百分数ＰＡ为１５．６７％，分级时效析出大量弥散分布的过饱和富Ｃｒ（α）相强化合金基体，提高了合金的硬度和弯曲强度．

Dispersion-hardened elastic alloys were developed by adding 3% Al in Ni-Cr alloyS. When the'stepped ageing was done at 550 C /sh,oversaturated Cr(α)-rich phases were obtained about 80 percent,or Cris 40K higher than its formulated content. The average diameter of precipitated Cr(α)-rich phase grains is1. 4685mm. The total area of grains accounts for 15. 67% of the areas surveyed. A large number of oversaturated Cr(α) phases precipitated due to stepped ageing can strengthen the alloy matrix and improve the hardal and bending strength of the alloy.