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通过真空感应炉和Gleeble—3800热模拟试验机研究了稀土对Fe-36Ni因瓦合金凝固组织和铸态热塑性的影响。结果表明:添加0.12%Ce+0.06%La混合稀土后,合金凝固组织显著细化,柱状晶变细变短,生长形态由直线状生长变为网篮状交错生长,等轴晶比例达40%。但添加0.12%Ce+0.06%La混合稀土后,合金在850~1 200℃温度区间的铸态热塑性严重恶化,这主要是由于在晶界上生成了大量Fe-Ni-Ce-La稀土晶间脆性相,削弱了晶界结合力,阻止了晶界移动,以致合金热塑性的恶化。
The effect of rare earth on the solidification structure and the as-cast thermoplasticity of Fe-36Ni Invar alloy was investigated by vacuum induction furnace and Gleeble-3800 thermal simulation tester. The results show that the solidified microstructure of the alloy is remarkably refined and the columnar grains become thinner and thinner. The growth morphology changes from linear growth to net-basket-like interlacing. The equiaxed grains reach 40% . However, the addition of 0.12% Ce + 0.06% La mischmetal seriously deteriorates the as-cast thermoplasticity of the alloy at 850-1,200 ℃, which is mainly due to the formation of a large amount of Fe-Ni-Ce-La rare earths Brittle phase, weakened the grain boundary binding force, preventing the grain boundary from moving, so that the deterioration of the alloy thermoplastic.