最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

+高級檢索
超聲-低頻電磁復合物理場作用下對AZ61鎂合金半連續(xù)鑄造凝固組織的研究影響 影響
DOI:
作者:
作者單位:

東北大學材料電磁過程研究教育部重點實驗室

作者簡介:

通訊作者:

中圖分類號:

基金項目:

國家“973”重點基礎(chǔ)研究發(fā)展規(guī)劃計劃資助項目(2013CB632203)；遼寧省自然科學基金資助項目(2014028027)國家自然科學基金(51074207,50974037)；國家“十二五”科技支撐計劃課題(2011BAE22B03)；國家“十二五”科技支撐計劃子課題(2012BAF09B01)；國家“973”計劃課題(2013CB632203)


Effect of compound physical Ultrasonic-Low Frequency Electromagnetic Casting Complex Field on Microstructures of Semi-Continuous Cast AZ61 Magnesium Alloy Billets
Author:
Affiliation:

Fund Project:

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問統(tǒng)計
    • |
  • 參考文獻
    • |
  • 相似文獻
    • |
  • 引證文獻
    • |
  • 資源附件
    • |
  • 文章評論
    摘要:

    本文采用不同外場施加方式和半連續(xù)鑄造制備Φ165mm AZ61鎂合金錠坯,研究不同外場施加方式對AZ61鎂合金錠坯晶粒尺寸和硬度的影響。結(jié)果表明,施加頻率為30Hz、電流為60A的交變電磁場后,鑄錠邊部和中心平均晶粒尺寸由常規(guī)DC半連續(xù)鑄造(DC)的248μm和276μm分別降至196μm和259μm,降低幅度分別達21%和6.2%,邊部和中心細化程度差別較大明顯不同；而施加超聲-低頻電磁復合場時,鑄錠邊部和中心平均晶粒尺寸由常規(guī)DC鑄造的248μm和276μm分別降至185μm和208μm,降低幅度分別達25.4%和24.6%,中心區(qū)域細化程度大幅度提高。另外,與常規(guī)DC鑄造相比,復合場鑄造使合金鑄錠的硬度提高且從鑄錠邊部到中心硬度差別明顯減小。可見,超聲場-低頻電磁復合場半連續(xù)鑄造彌補了電磁場的“集膚效應”,而電磁場的集膚效應彌補了超聲的“聚集作用”,其復合場“取長補短”共同作用顯著改善了AZ61鎂合金錠坯的內(nèi)部質(zhì)量,使凝固組織更加均勻、細小,硬度提高并分布均勻。。另外,與常規(guī)DC鑄造相比,復合場使合金鑄錠的硬度有所提高且分布更為均勻。

    Abstract:

    Using different external fields application ways, AZ61 magnesium alloy was semi-continuously cast into billets with diameter of 165mm. The effects of the different external fields application ways on the grain size and hardness of AZ61 billets were investigated. The results show that compared with the conventional direct-chill semi-continuous cast billets, the grain size of the AZ61 billets cast reduced from 248μm in the edge and 276μm in the centre to 196μm and 259μm respectively(with a reduce of 21% and 6.2% respectively) by low-frequency electromagnetic field (f=30Hz, I=60A)，the structure in edge and centre refining effects are significantly diverse. However, the grain size in the edge and centre from reduced from 248μm in the edge and 276μm in the centre to 185μm and 208μm respectively (with a reduce of 25.4% and 24.6% respectively) by combining ultrasonic and LFEC, and the structure in centre refining effects were significantly improved. Moreover, compared with the conventional DC casting, the compound physical Field can improve the hardness of the ingot and obviously reduce the different hardness from edge to centre. Therefore, the compound physical Field obviously improved the inner qualities of AZ61 magnesium alloy ingot billet, and the microstructure is markedly refined, so the hardness of ingot uniformly improved.

    參考文獻
    相似文獻
    引證文獻
引用本文

張志強.超聲-低頻電磁復合物理場作用下對AZ61鎂合金半連續(xù)鑄造凝固組織的研究影響 影響[J].稀有金屬材料與工程,2016,45(9):2385~2390.[zhangzhiqiang. Effect of compound physical Ultrasonic-Low Frequency Electromagnetic Casting Complex Field on Microstructures of Semi-Continuous Cast AZ61 Magnesium Alloy Billets[J]. Rare Metal Materials and Engineering,2016,45(9):2385~2390.]
DOI：[doi]

復制
文章指標
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2015-07-22
  • 最后修改日期:2015-09-25
  • 錄用日期:2015-12-11
  • 在線發(fā)布日期: 2016-10-09
  • 出版日期: