-1~5 s-1條件下的應(yīng)力-應(yīng)變曲線。以實驗數(shù)據(jù)為基礎(chǔ),運用KM模型、Poliak-Jonas準(zhǔn)則、Avrami模型較為系統(tǒng)的描述了該合金動態(tài)再結(jié)晶過程的流變應(yīng)力、臨界應(yīng)變量、組織演化動力學(xué)等特征。并在Prasad功率耗散率模型的基礎(chǔ)上,將動態(tài)再結(jié)晶組織轉(zhuǎn)變體積分?jǐn)?shù)引入其中,獲得了動態(tài)再結(jié)晶過程的能量變化規(guī)律,借助微觀組織表征技術(shù),揭示了該合金動態(tài)再結(jié)晶機理。研究結(jié)果表明：GH4742合金隨著變形溫度的升高和應(yīng)變速率的降低,動態(tài)再結(jié)晶臨界應(yīng)變量減小,組織轉(zhuǎn)變體積分?jǐn)?shù)增加。發(fā)生完全動態(tài)再結(jié)晶時的功率耗散率大于0.44,形成機制為位錯誘導(dǎo)的連續(xù)動態(tài)再結(jié)晶。"/>

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渦輪盤用GH4742合金動態(tài)再結(jié)晶行為
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沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院

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Study on the Dynamic Recrystallization Behavior of GH4742 Superalloy
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Shenyang University of Technology

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    摘要:

    采用單道次等溫壓縮實驗獲得了GH4742合金在變形溫度為980～1100℃,應(yīng)變速率為5×10-3 s-1~5 s-1條件下的應(yīng)力-應(yīng)變曲線。以實驗數(shù)據(jù)為基礎(chǔ),運用KM模型、Poliak-Jonas準(zhǔn)則、Avrami模型較為系統(tǒng)的描述了該合金動態(tài)再結(jié)晶過程的流變應(yīng)力、臨界應(yīng)變量、組織演化動力學(xué)等特征。并在Prasad功率耗散率模型的基礎(chǔ)上,將動態(tài)再結(jié)晶組織轉(zhuǎn)變體積分?jǐn)?shù)引入其中,獲得了動態(tài)再結(jié)晶過程的能量變化規(guī)律,借助微觀組織表征技術(shù),揭示了該合金動態(tài)再結(jié)晶機理。研究結(jié)果表明：GH4742合金隨著變形溫度的升高和應(yīng)變速率的降低,動態(tài)再結(jié)晶臨界應(yīng)變量減小,組織轉(zhuǎn)變體積分?jǐn)?shù)增加。發(fā)生完全動態(tài)再結(jié)晶時的功率耗散率大于0.44,形成機制為位錯誘導(dǎo)的連續(xù)動態(tài)再結(jié)晶。

    Abstract:

    The stress-strain curves of GH4742 at deformation temperature of 980-1100 °C and strain rate of 5×10-3 s-1 to 5 s-1 were acquired through single-pass isothermal compression experiments. The flow stress, critical strain capacity and structure evolution dynamics of GH4742 during dynamic recrystallization were systematically described on basis of experimental data using KM model, Poliak-Jonas criterion, and Avrami model. Then based on the Prasad power dissipation rate model, the structural transformation volume fraction was introduced to determine the energy variation rules during dynamic recrystallization. The mechanism underlying the dynamic recrystallization of GH4742 was revealed with the help of microstructure characterization. It was found the critical strain capacity of GH4742 during dynamic recrystallization decreased and the structural transformation volume fraction increased with the rise of deformation temperature or the decline of strain rate. The power dissipation rate of complete dynamic recrystallization was larger than 0.44, and the forming mechanism was dislocation-induced continuous dynamic recrystallization.

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周 舸,李鑒霖,門 月,張浩宇,車 欣,朱曉飛,陳立佳.渦輪盤用GH4742合金動態(tài)再結(jié)晶行為[J].稀有金屬材料與工程,2021,50(4):1318~1324.[Zhou Ge, Li Jianlin, Men Yue, Zhang Haoyu, Che Xin, Zhu Xiaofei, Chen Lijia. Study on the Dynamic Recrystallization Behavior of GH4742 Superalloy[J]. Rare Metal Materials and Engineering,2021,50(4):1318~1324.]
DOI：10.12442/j. issn.1002-185X.20200336

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  • 收稿日期:2020-05-18
  • 最后修改日期:2020-07-18
  • 錄用日期:2020-08-04
  • 在線發(fā)布日期: 2021-05-08
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