鎳基粉末高溫合金原始顆粒邊界形成及組織演化特征

鎳基粉末高溫合金原始顆粒邊界形成及組織演化特征Formation and microstructure evolution of precipitation on prior particle boundaries in P/M nickel-base superalloys

采用等離子旋轉電極(PREP)法制備高溫合金粉末，通過熱等靜壓(HIP)和熱擠壓(HE)進行固結成型，對制備的粉末及HIP、HE態合金內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。結果表明：合金在粉末態已發生元素偏析，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合面析出，合金經熱擠壓后，原始顆粒邊界上大的 相完全消失，連續的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，合金已完成動態再結晶。

The superalloys powders were prepared by plasma rotating electrode processing (PREP). The powder was consolidated by hot isostatic pressing (HIP) and hot extrusion (HE). The microstructures of powders, as-HIPed and as-HEXed alloys were examined. The constitution, formation mechanism and the microstructure evolution of PPB during the hot extrusion were studied. The results show that some small size oxides enriched with Al and a layer of Zr, O, C concentrate on the surface of powder. The PPB is stracture of phases, MC carbides and Al2O3, Zr enriched oxides particles. The PPB formation mechanism is that, under the effect of temperature field, carbides, precipitates and oxides are more ready to precipitate at bonding interface. After hot extrusion, the big phases at PPB are gone and continuous PPB is broken. These particles aligned along extrusion direction are the remains of PPB (MC type carbides and trace amounts of oxides), and the dynamic recrystallization occurs during hot extrusion.

全文下載：https://pan.baidu.com/s/1gfhHlQV

作為值得信賴的合作伙伴和高品質金屬合金的半成品供應商，通項公司擁有完善的服務體系和專業的團隊。在同客戶交易的過程中，我們力求根據不同的應用需求將我們的產品做到精益求精。針對當前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。

TXCO  has  been  a  reliable  partner  and  supplier  of  sophisticated  and  high-quality  semi-finished  products  maed  of  alloys.  In dialogue  with  our  customers,  we  optimise  our  products  to  meet  the  specific  application  requirements.  TXCO  develops  the  best  alloy  material  solutions  for  current  and  future  challenges.

獲取更多我們供應的產品和服務信息，請致電086-021-6786 0205或發電子郵件service@sinoav.com聯系我們，您也可以通過微信，微博，領英，臉書，推特和谷歌+與我們互動。

For  more  information  on  the  products  and  services  that  we  supply,  call  us  at  086-021-6786 0205  or  email  us  at   service@sinoav.com.  You  can  also  get  in  touch  on  social  media,  we  are  constantly  active  on  Weixin,  Weibo,  LinkedIn,  Facebook,  Twitter  and  Google+.