孙雅茹,孙文儒,郭守仁,胡壮麒

• 1:沈阳工业大学理学院
• 2:中国科学院金属研究所

摘要(Abstract)：

为了降低U720Li镍基合金锻造强度,通过改变γ'相的组织形态和析出数量的方法,研究1130℃下保温10、20和30 h后γ'相的析出形态、体积分数和显微硬度的影响,并对其进行1100～1170℃,变形速率1.0 s-1和50%变形量的热变形。结果表明,当保温30 h后,合金中γ'相形貌由方形向圆形转变,γ'相尺寸长大,体积含量最小,具有较小的流变应力。在1130℃保温30 h条件下,当变形温度低于1150℃时,析出的γ'相数量越多,对位错的阻碍作用越强烈,流变抗力越大;当变形温度超过1150℃时,合金中γ'相溶解,此时变形温度越高,合金的流变抗力越低。同时在较低温度下变形,因γ'相对晶界迁移的阻碍作用,再结晶晶粒尺寸较小,而在高温下变形再结晶晶粒长大,温度越高,再结晶晶粒越大。

关键词(KeyWords)： γ'相;U720Li合金;热变形;位错;再结晶

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50271072)

作者(Author): 孙雅茹,孙文儒,郭守仁,胡壮麒

DOI: 10.13289/j.issn.1009-6264.2013.03.011

参考文献(References)：

• [1]Monajati H,Jahazi M,Yue S,et al.Deformation characteristics of isothermally forged Udimet 720 nickel-base superalloy[J].Metallurgical andMaterials Transactions A,2005,36:895-906.
• [2]Bryant D J,Mclntozh G.The manufacture and evaluation of a large turbine disc in cast and wrought alloy720Li[C]//Superalloys1996,Pennsylvania:TMS,1996:713-722.
• [3]Reed R C,Jackson M P,Na Y S.Characterization and modeling of the precipitation of the sigma phase in UDIMET720and UDIMET720Li[J].Metallurgical and Materials Transactions A,1999,30(3):521-533.
• [4]Keefe P W,Mancuso S O.Effect of heat treatment and chemistry on the long-term phase stability of a high strength Nikel-based Superalloys[C]//Superalloy 1992,Pennsylvania:TMS,1992:487.
• [5]Green K A,Lemsky J A,Gasior R M.Development of isothermally forged P/M Udimet720for turbine disk applications[C]//Superalloys1996,Pennsylvania:TMS,1996:697-703..
• [6]李成功,曾凡昌.俄国等温锻造技术的进展[J].航空科学技术,1996(5):32-35.LI Cheng-gong,ZENG Fan-chang.Development of Russian isothermal forging technology[J].Aviation Science and Technology,1996,5:32-35.
• [7]王淑云,李惠曲,李辉中.FGH95合金等温锻造工艺研究[J].稀有金属,2003,27(4):452-454.WANG Shu-yun,LI Hui-qu,LI Hui-zhong.Study on isothermal forging technology of FGH95 alloy[J].Chinese Journal of Rare Metals,2003,27(4):452-454.
• [8]Robert N,Jarrett,John P,et al.Effect of cobalt on the hot workability of nickel-base Superalloy[C]//Superalloy1984,Pennsylvania:TMS,1984:455-466.
• [9]龙正东,庄景云,邓波,等.一种提高强化高温合金热加工性能的新方法[J].金属学报,1999,35(11):1211-1213.LONG Zheng-dong,ZHUANG Jing-yun,DENG Bo,et al.A new method to improve the hot workability of high strength Ni-based superalloys[J].ActaMetallurgica Sinica,1999,35(11):1211-1213.

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