二次时效处理对Ni-Cr-Al合金组织和性能的影响

Effect of Low Temperature Progressive Aging Treatment on Structures and Properties of Ni-Cr-Al Alloys

在 Ni-Cr 合金中加入3%Al 和0.3%Ce.细化合金晶粒组织可以拔成直径0.2～0.3 mm 细丝,形成弥散硬化型的高硬弹合金.实验表明:在600℃,3h 一次时效处理后再进行500℃,5 h 低温度二次时效处理能获得86%(质量分数)的过饱和富 Cr(α).测定析出富Cr(α)相颗粒的平均直径为1.6214 mm,颗粒的总面积占测绘面积的百分数为20.7%.二次时效处理使一次时效析出的富 Cr(α)相颗粒聚集最大,并且析出新生富 Cr(α)相颗粒细小,弥散分布,提高了合金的硬度和强度,改善了合金的韧性.

Thinned alloys are drawn out to φ0.2～0.3 mm wires and dispersion-hardened high-hard elastic alloys are made by adding 3% AI and 0.3% Ce in Ni-Cr alloys.The experimental results show that after ag- ing treatmeal at 600℃ for 3 h and under low temperature progressive aging treatment at 500℃ for 5h,su- persaturated Cr(α)-rich phases(86wt%Cr)are formed.The Cr content of these phases is by 47wt% higher than that in the fomer alloys.The separated Cr(α)-rich phase grains have an average size of 1.6214 mm and the total area of the particles'is 20.76% of the measured area.The structural shape graphic shows that the separated Cr(α)-rieh phase grains of aging treatment grow up and new Cr(α)-rich phase grains disperse in the whole alloy matrix.The hardness,strength and toughness of the alloys are improved.