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定向凝固工藝對(duì)高溫合金DZ417G變截面疏松形成的影響
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中國(guó)科學(xué)院金屬研究所,中國(guó)科學(xué)院金屬研究所,中國(guó)科學(xué)院金屬研究所,東北大學(xué)

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INFLUENCE OF DIRECTIONALY SOLIDIFIED PROCESS ON POROSITY IN THE CROSS-SECTION TRANSITIONS OF Ni-BASED SUPERALLOY DZ417G
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institute of metal research,chinese academy of sciences,institute of metal research,chinese academy of sciences,Insititute of Metal Research,Chinese Academy of Science,northeastern university

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    摘要:

    研究了定向凝固工藝對(duì)高溫合金DZ417G模擬葉片變截面疏松形成的影響。結(jié)果表明，模擬葉片靠近中心圓柱一側(cè)變截面疏松含量比靠近爐壁變截面高一個(gè)數(shù)量級(jí)左右。在一定澆注溫度范圍內(nèi)(1480~1580℃)，隨澆注溫度的升高，靠近中心圓柱變截面位置疏松含量先升高后降低，在澆注溫度為1550℃時(shí)疏松含量最高；同時(shí)在該澆注溫度范圍內(nèi)，隨著澆注溫度的升高，靠近爐壁側(cè)變截面疏松含量略有降低。在一定抽拉速度范圍內(nèi)(1~10mm/min)，隨著抽拉速度的升高，靠近中心圓柱變截面位置疏松含量逐漸升高，靠近爐壁位置疏松含量逐漸降低。根據(jù)以上結(jié)果，針對(duì)模擬葉片變截面位置提出了在澆注溫度、抽拉速度和顯微疏松含量的對(duì)應(yīng)關(guān)系。此外，定向凝固工藝對(duì)變截面疏松形成的影響主要是由固液界面前沿的溫度梯度變化引起的。

    Abstract:

    The influence of directionally solidified process on porosity in cross-section transitions of dummy blade nickel-based superalloy DZ417G was investigated. It was found that the content of porosity at transition platform near the central runner was an order of magnitude higher than it is near the heater. In a certain casting temperature range (1480~1580 ℃)，with the increase of casting temperature，the content of porosity at transition platform near the central runner increased at first then decreased，the temperature with maximum content of porosity was 1550℃，however，in this casting temperature range，with the increase of casting temperature，the content of porosity at transition platform near the heater decrease a little bit. In a certain withdrawal rate (1~10mm/min)，with the increase of withdrawal rate，porosity at transition platform near the central runner increases gradually，however porosity at the opposite side part decreases. Based on these results，the relationship between casting temperature withdrawal rate and the content of porosity in transition platform dummy blade has been proposed. Besides，the influence of directional solidification process on the formation of porosity on the cross-section of the platform is mainly caused by the variation of temperature gradient of the solid-liquid interface.

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王永鋒,李金國(guó),孟祥斌,劉興剛.定向凝固工藝對(duì)高溫合金DZ417G變截面疏松形成的影響[J].稀有金屬材料與工程,2016,45(5):1264~1270.[wangyongfeng, li jinguo, Meng xiangbin, liu xinggang. INFLUENCE OF DIRECTIONALY SOLIDIFIED PROCESS ON POROSITY IN THE CROSS-SECTION TRANSITIONS OF Ni-BASED SUPERALLOY DZ417G[J]. Rare Metal Materials and Engineering,2016,45(5):1264~1270.]
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歷史
  • 收稿日期:2014-05-06
  • 最后修改日期:2014-10-21
  • 錄用日期:2015-02-06
  • 在線發(fā)布日期: 2016-06-02
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