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多向鍛造純鎢形變儲存能及動態(tài)再結晶行為分析
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合肥工業(yè)大學材料科學與工程學院,合肥工業(yè)大學材料科學與工程學院,合肥工業(yè)大學材料科學與工程學院,安徽江淮汽車股份有限公司,合肥工業(yè)大學材料科學與工程學院,合肥工業(yè)大學材料科學與工程學院

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教育部新世紀優(yōu)秀人才支持計劃(NCET-13-0765), 國際熱核聚變實驗堆計劃(2014GB121000)；


Analysis of deformation stored energy and dynamic recrystallization behavior of pure tungsten processed by multiple direction forging
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School of Materials Science and Engineering,Hefei University of Technology,School of Materials Science and Engineering,Hefei University of Technology,School of Materials Science and Engineering,Hefei University of Technology,Anhui Jiang Huai Automobile Corp,School of Materials Science and Engineering,Hefei University of Technology,School of Materials Science and Engineering,Hefei University of Technology

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    摘要:

    對純鎢燒結體進行多向鍛造試驗,運用OM和DSC分析了純鎢多向鍛造組織演化規(guī)律及形變儲存能的變化,結合XRD、EBSD對純鎢形變儲存能的來源及動態(tài)再結晶行為進行了研究。結果表明：多向鍛造后純鎢內(nèi)部孔隙明顯減少,熱變形過程中的動態(tài)再結晶導致晶粒顯著細化,變形后保留在晶粒及亞晶內(nèi)部的高密度位錯結構導致形變儲存能的增加,再結晶晶粒主要沿能量較高的晶界及晶界交匯處分布,其動態(tài)再結晶機制為形變誘導晶界遷移機制與亞晶粗化及晶粒機械破碎的混合機制,多向鍛造后純鎢再結晶溫度基本不變,材料熱穩(wěn)定性有所提高。

    Abstract:

    Microstructure evolution and deformation stored energy change of sintered pure tungsten during multi-directional forging was investigated by OM and DSC. The source of deformation stored energy and dynamic recrystallization behavior of pure tungsten were studied with XRD and EBSD. The results indicate that dynamic recrystallization during hot deformation leads to remarkably grain refining with porosity significantly reduced. High-density dislocation structure retained in the grain and subgrain result in an increase in deformation stored energy after deformation. There are quantities of recrystallized grains distributed along the higher energy zone in grain boundaries and grain boundary Intersection. The mechanism of dynamic recrystallization is the mixture of deformation induced grain boundary migration mechanism with subgrain coarsening and grain mechanical fragmentation. The recrystallization temperature of pure tungsten unchanged substantially with thermal stability increased after multiple direction forging.

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孫大智,李萍,林泉,華睿,薛克敏,吳玉程.多向鍛造純鎢形變儲存能及動態(tài)再結晶行為分析[J].稀有金屬材料與工程,2018,47(3):937~942.[Sun Da-zhi, Li Ping, Lin Quan, Hua Rui, Xue Ke-min, Wu Yu-cheng. Analysis of deformation stored energy and dynamic recrystallization behavior of pure tungsten processed by multiple direction forging[J]. Rare Metal Materials and Engineering,2018,47(3):937~942.]
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  • 收稿日期:2016-02-12
  • 最后修改日期:2016-05-06
  • 錄用日期:2016-06-12
  • 在線發(fā)布日期: 2018-04-11
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