镍基粉末高温合金原始颗粒边界形成及组织演化特征

发布时间：2018-04-23 04:25

本文选题：镍基高温合金 + 粉末冶金　；参考：《中国有色金属学报》2016年01期

【摘要】：采用等离子旋转电极(PREP)法制备高温合金粉末,通过热等静压(HIP)和热挤压(HE)进行固结成型,对制备的粉末及HIP、HE态合金内部和表面显微组织进行表征,探索镍基高温合金原始颗粒边界(PPB)的组成、形成机制及组织演化特征。结果表明:合金在粉末态已发生元素偏析,粉末表层有细小的富Al氧化物颗粒,且颗粒表面有Zr、C、O元素的富集层;合金PPB主要为连续的大尺寸??相、MC型碳化物、Al2O3和富Zr的氧化物颗粒;PPB形成机制是在温度场的作用下,碳化物、??相和氧化物易于在结合面析出,合金经热挤压后,原始颗粒边界上大的??相完全消失,连续的PPB被破碎,形成含MC碳化物和少量氧化物的沿挤压方向竖状排列的小颗粒,此时,合金已完成动态再结晶。
[Abstract]:A plasma rotating electrode (PREP) method was used to prepare the superalloy powder. Through the consolidation molding by hot isostatic pressure (HIP) and hot extrusion (HE), the powder and the internal and surface microstructure of the HE state alloy were characterized. The composition, formation mechanism and microstructure evolution of the original particle boundary (PPB) of the nickel base superalloy were investigated. The results showed that: The alloy has an element segregation in the last state of the powder, with fine Al oxide particles on the surface of the powder and the enrichment layer of Zr, C and O on the surface of the particles; the alloy PPB is mainly a continuous large size phase, MC carbide, Al2O3, and Zr rich oxide particles, and the formation mechanism of the PPB is that the carbide, the phase and the oxide are easy to be bonded under the effect of temperature field. After hot extrusion, the alloy disappears completely on the boundary of the original particle, and the continuous PPB is broken to form small particles with MC carbide and a small amount of oxide in the direction of the extrusion. At this time, the alloy has completed the dynamic recrystallization.

【作者单位】：中南大学粉末冶金国家重点实验室;中南大学粉末冶金研究院;
【基金】：国家高技术研究发展计划资助项目(2012AA03A514) 国家自然科学基金资助项目(51401242,61271356,51205031) 研究生自主探索项目(2015zzts031)~~
【分类号】：TG132.3

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