oC、應(yīng)變速率為0.001-0.1s-1條件下材料的流變力學(xué)行為。采用Poliak和Jonas所提出的臨界條件動(dòng)力學(xué)理論,確定了動(dòng)態(tài)再結(jié)晶臨界應(yīng)變(εc)和臨界應(yīng)力(σc),揭示了變形溫度與應(yīng)變速率對(duì)εc和σc的影響規(guī)律。結(jié)果表明,溫度補(bǔ)償應(yīng)變速率因子Z與εc、σc、εp(峰值應(yīng)變)和σp(峰值應(yīng)力)間的關(guān)系可以采用指數(shù)函數(shù)形式描述。建立了該合金動(dòng)態(tài)再結(jié)晶臨界發(fā)生模型：εc=1.2×10-3Z0.147,動(dòng)態(tài)再結(jié)晶臨界應(yīng)變與流變應(yīng)力曲線峰值應(yīng)變的比值約為0.73。根據(jù)對(duì)模型的分析表明,臨界應(yīng)變與Z參數(shù)之間呈現(xiàn)正相關(guān)性,隨著Z參數(shù)的減小(變形溫度升高或應(yīng)變速率降低),材料發(fā)生動(dòng)態(tài)再結(jié)晶的臨界應(yīng)變減小,說明隨著變形溫度的升高與應(yīng)變速率的下降,能夠促進(jìn)動(dòng)態(tài)再結(jié)晶行為的發(fā)生,并通過對(duì)熱變形后微觀組織的觀察,驗(yàn)證了所建立動(dòng)態(tài)再結(jié)晶臨界模型的可靠性。"/>

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(jí)檢索
TiAl基合金動(dòng)態(tài)再結(jié)晶臨界模型建立
DOI:
作者:
作者單位:

哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(51405110),中國(guó)博士后科學(xué)基金(2014M551234),高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金(20132302120002),黑龍江省博士后基金(LBH-Z14096)。


Modeling of the critical conditions on dynamic recrystallization for TiAl-based alloy
Author:
Affiliation:

National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology

Fund Project:

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

    依據(jù)粉末冶金Ti-47Al-2Nb-2Cr合金熱模擬壓縮實(shí)驗(yàn)結(jié)果,研究了變形溫度為950-1150oC、應(yīng)變速率為0.001-0.1s-1條件下材料的流變力學(xué)行為。采用Poliak和Jonas所提出的臨界條件動(dòng)力學(xué)理論,確定了動(dòng)態(tài)再結(jié)晶臨界應(yīng)變(εc)和臨界應(yīng)力(σc),揭示了變形溫度與應(yīng)變速率對(duì)εc和σc的影響規(guī)律。結(jié)果表明,溫度補(bǔ)償應(yīng)變速率因子Z與εc、σc、εp(峰值應(yīng)變)和σp(峰值應(yīng)力)間的關(guān)系可以采用指數(shù)函數(shù)形式描述。建立了該合金動(dòng)態(tài)再結(jié)晶臨界發(fā)生模型：εc=1.2×10-3Z0.147,動(dòng)態(tài)再結(jié)晶臨界應(yīng)變與流變應(yīng)力曲線峰值應(yīng)變的比值約為0.73。根據(jù)對(duì)模型的分析表明,臨界應(yīng)變與Z參數(shù)之間呈現(xiàn)正相關(guān)性,隨著Z參數(shù)的減小(變形溫度升高或應(yīng)變速率降低),材料發(fā)生動(dòng)態(tài)再結(jié)晶的臨界應(yīng)變減小,說明隨著變形溫度的升高與應(yīng)變速率的下降,能夠促進(jìn)動(dòng)態(tài)再結(jié)晶行為的發(fā)生,并通過對(duì)熱變形后微觀組織的觀察,驗(yàn)證了所建立動(dòng)態(tài)再結(jié)晶臨界模型的可靠性。

    Abstract:

    The flow stress behavior of powder metallurgy (PM) Ti-47Al-2Nb-2Cr alloy during hot deformation was investigated at temperature of 950-1150oC and strain rates of 0.001-0.1s-1. In this paper, the influence of deformation parameters on the critical conditions of the dynamic recrystallization behavior was studied systematically. Based on the analysis of flow stress curves under different hot processing parameters, the critical strain (εc) and critical stress (σc) were obtained with the help of the critical condition theory proposed by Poliak and Jonas. It is also shown that the critical condition model was established by employing the strain rate and temperature compensation factor (Z): εc=1.2×10-3Z0.147. The occurrence of dynamic recrystallization behavior will be promoted with the increase of deformation temperature and the decrease of strain rate. Moreover, the reliability of the established model was verified by the observation of deformed microstructure.

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

萬(wàn)志鵬,孫宇,胡連喜,于歡. TiAl基合金動(dòng)態(tài)再結(jié)晶臨界模型建立[J].稀有金屬材料與工程,2018,47(3):835~839.[Wan Zhi-peng, Sun Yu, Hu Lian-xi, Yu Huan. Modeling of the critical conditions on dynamic recrystallization for TiAl-based alloy[J]. Rare Metal Materials and Engineering,2018,47(3):835~839.]
DOI：[doi]

復(fù)制
文章指標(biāo)
  • 點(diǎn)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:2016-01-25
  • 最后修改日期:2016-03-14
  • 錄用日期:2016-03-30
  • 在線發(fā)布日期: 2018-04-11
  • 出版日期: