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通过OM,SEM,TEM和HB-3000布氏硬度计研究了在真空下,熔体保温时间对含铝Monel合金组织与性能的影响。结果表明,在不同的熔体保温时间下,含铝Monel合金组织均由树枝晶状的γ初晶和γ′相组成。其中γ′相有2种存在形式,一种为在枝晶干上单个颗粒弥散分布的γ′相和成花瓣状分布在枝晶干与枝晶间过渡区的γ′相;另一种为枝晶间的离异共晶γ′相。随着熔体保温时间的延长,树枝晶状的γ初晶先细化后粗化,二次枝晶臂间距先减小后增大,枝晶间的共晶γ′相先增多后减少,且弥散于枝晶干上的γ′相的直径先减小后增大;同时,随着熔体保温时间的延长,含铝Monel合金的布氏硬度先增大后减小。当熔体保温时间为60min时,合金组织中树枝晶较细小,枝晶间的共晶γ′相较多,枝晶干上的γ′相直径较小,合金的布氏硬度较大。
The effects of melt holding time on microstructure and properties of Al-containing Al-containing alloys were investigated by OM, SEM, TEM and HB-3000 Brinell hardness tester. The results show that the microstructure of the Al-containing Al-alloy is composed of dendritic γ primary and γ ’phases under different melt holding time. The γ ’phase has two kinds of existence forms, one is the γ’ phase and the petaloid distributed in the transition zone between the dendrite and the dendrite in the dendrite dry single particle dispersed phase; the other is Divorced eutectic γ ’phase between dendrites. With the extension of the holding time of the melt, the dendritic γ primary primary crystals are refined and then roughened, the secondary dendrite arm spacing first decreases and then increases, and the eutectic γ ’phase first increases and then decreases, And the diameter of the γ ’phase dispersed on the dendrite first decreases and then increases. Meanwhile, with the increase of the holding time of the melt, the Brinell hardness of the aluminum-containing Monel alloy first increases and then decreases. When the melt holding time is 60min, the dendrites in the alloy are smaller and the eutectic γ ’phase is more between the dendrites. The γ’ phase diameter on the dendrite stem is smaller and the Brinell hardness of the alloy is larger.