-1及工程應(yīng)變50%的條件下,利用Gleeble-3500TM熱模擬試驗機對噴射成形GH738合金進行熱壓縮試驗,研究了合金的熱流變行為并建立了流變本構(gòu)關(guān)系,結(jié)合顯微組織分析及統(tǒng)計技術(shù)研究了合金的組織演變情況。結(jié)果表明,流變應(yīng)力隨溫度的升高和應(yīng)變速率的減小而降低。合金熱變形激活能為580.81kjmol-1。隨著形變溫度的升高,高位錯密度處晶界弓出形核使晶界“鋸齒”化并形成項鏈組織,在1100℃獲得完全動態(tài)再結(jié)晶組織,隨溫度繼續(xù)升高及應(yīng)變速率的降低組織明顯長大。"/>

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噴射成形GH738合金熱變形特性及微觀組織演變
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北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室,北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室,北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室,北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室,北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室,北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室,北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室

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國家973計劃（2010CB631205）；國家自然科學(xué)基金（51304177）；國家科技支撐計劃資助（2015BAE03B01）


Deformation Characteristic and Microstructure Evolution of Spray Formed GH738
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Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials

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    在溫度950~1200℃、應(yīng)變速率0.13~6.5s-1及工程應(yīng)變50%的條件下,利用Gleeble-3500TM熱模擬試驗機對噴射成形GH738合金進行熱壓縮試驗,研究了合金的熱流變行為并建立了流變本構(gòu)關(guān)系,結(jié)合顯微組織分析及統(tǒng)計技術(shù)研究了合金的組織演變情況。結(jié)果表明,流變應(yīng)力隨溫度的升高和應(yīng)變速率的減小而降低。合金熱變形激活能為580.81kjmol-1。隨著形變溫度的升高,高位錯密度處晶界弓出形核使晶界“鋸齒”化并形成項鏈組織,在1100℃獲得完全動態(tài)再結(jié)晶組織,隨溫度繼續(xù)升高及應(yīng)變速率的降低組織明顯長大。

    Abstract:

    The hot flow behaviors and deformation model of spray formed superalloy GH738 were investigated using Gleeble-3500TM simulator at the temperature range of 950~1200℃, strain rate range of 0.13~6.5s-1 and reduction of 50%. The evolution of microstructure was studied by microscope and image analysis system. The results show that the flow stress decrease with increasing deformation temperature or decreasing strain rate. The hot deformation activation energy Q is 580.81kjmol-1. As the temperature increase, the necklace structures are obtained along the boundaries which are protuberated by the new recrystallized grains in the high dislocation-density serrated grain boundary zones. The structures show fully dynamic recrystallization characteristic at the temperature of 1100℃ while the higher temperature and the low strain rate forced the structure grown.

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王 悅,許文勇,劉 娜,鄭 亮,袁 華,李 周,張國慶.噴射成形GH738合金熱變形特性及微觀組織演變[J].稀有金屬材料與工程,2018,47(3):878~883.[Wang Yue, Xu Wenyong, Liu Na, Zheng Liang, Yuan Hua, Li Zhou, Zhang Guoqing. Deformation Characteristic and Microstructure Evolution of Spray Formed GH738[J]. Rare Metal Materials and Engineering,2018,47(3):878~883.]
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  • 收稿日期:2016-02-24
  • 最后修改日期:2016-06-20
  • 錄用日期:2016-07-15
  • 在線發(fā)布日期: 2018-04-11
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