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GH738高溫合金熱加工行為
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國(guó)家自然科學(xué)基金（51071017）


Hot Deformation Behaviour of Superalloy GH738
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    摘要:

    采用Gleeble-1500熱模擬機(jī)對(duì)GH738鎳基高溫合金進(jìn)行高溫?zé)釅嚎s變形實(shí)驗(yàn)，分析該合金在變形溫度1000~1160 ℃、應(yīng)變速率0.01~10 s-1、工程變形量15%~70%條件下流變應(yīng)力的變化規(guī)律。確定GH738合金熱變形方程，建立熱加工圖(Processing map)，并通過(guò)組織觀察對(duì)熱加工圖進(jìn)行解釋。GH738合金熱變形激活能Q為499 kJ/mol；熱加工圖隨不同變形量而變化，在應(yīng)變速率較低，溫度較高的狀態(tài)下，能量耗散效率較高。綜合應(yīng)變量為0.2，0.4，0.6和0.8應(yīng)變量下的熱加工圖，確立了該合金最佳熱加工“安全通道”，為GH738高溫合金熱加工工藝優(yōu)化提供理論依據(jù)。

    Abstract:

    Hot deformation behavior of GH738 superalloy was studied in the temperature range of 1000~1160 oC, strain rate range of 0.01 ~10 s-1 and engineering strain range 15%~70% by the Gleeble-1500 simulator. The hot deformation equation was determined to characterize the dependence of peak stress on the temperature and strain rate. Processing maps for hot working were established on the basis of the variations of efficiency of power dissipation with temperature and strain rate, and interpreted according to the microstructure observation. The apparent activation energy Q of GH738 superalloy is about 499 kJ/mol. The maps obtained in true strain range from 0.2 to 0.8 are essentially different, and the efficiency of power dissipation increases gradually with the increase of temperature and the decrease of strain rate. An optimum zone named safe area is obtained for GH738 alloy deformation. The above results can be used as a reference for hot working of GH738 superalloy.

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姚志浩,董建新,張麥倉(cāng),鄭 磊,于秋穎. GH738高溫合金熱加工行為[J].稀有金屬材料與工程,2013,42(6):1199~1204.[Yao Zhihao, Dong Jianxin, Zhang Maicang, Zheng Lei, Yu Qiuying. Hot Deformation Behaviour of Superalloy GH738[J]. Rare Metal Materials and Engineering,2013,42(6):1199~1204.]
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  • 收稿日期:2012-06-15
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