本文選題：鎳基高溫合金 + 粉末冶金�。� 參考：《中國有色金屬學報》2016年01期

【摘要】：采用等離子旋轉(zhuǎn)電極(PREP)法制備高溫合金粉末,通過熱等靜壓(HIP)和熱擠壓(HE)進行固結(jié)成型,對制備的粉末及HIP、HE態(tài)合金內(nèi)部和表面顯微組織進行表征,探索鎳基高溫合金原始顆粒邊界(PPB)的組成、形成機制及組織演化特征。結(jié)果表明:合金在粉末態(tài)已發(fā)生元素偏析,粉末表層有細小的富Al氧化物顆粒,且顆粒表面有Zr、C、O元素的富集層;合金PPB主要為連續(xù)的大尺寸??相、MC型碳化物、Al2O3和富Zr的氧化物顆粒;PPB形成機制是在溫度場的作用下,碳化物、??相和氧化物易于在結(jié)合面析出,合金經(jīng)熱擠壓后,原始顆粒邊界上大的??相完全消失,連續(xù)的PPB被破碎,形成含MC碳化物和少量氧化物的沿擠壓方向豎狀排列的小顆粒,此時,合金已完成動態(tài)再結(jié)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.

【作者單位】： 中南大學粉末冶金國家重點實驗室;中南大學粉末冶金研究院;
【基金】：國家高技術研究發(fā)展計劃資助項目(2012AA03A514) 國家自然科學基金資助項目(51401242,61271356,51205031) 研究生自主探索項目(2015zzts031)~~
【分類號】：TG132.3

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