(1. 沈陽(yáng)工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，沈陽(yáng) 110870；2. 遼寧大學(xué) 輕型產(chǎn)業(yè)學(xué)院，沈陽(yáng) 110036；
3. 東北大學(xué) 軋制技術(shù)及連軋自動(dòng)化國(guó)家重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110004)
摘 要: 通過(guò)對(duì)等溫鍛造和熱連軋工藝制備的GH4169合金進(jìn)行直接時(shí)效、蠕變性能測(cè)試和組織形貌觀察，研究熱連軋對(duì)GH4169合金組織結(jié)構(gòu)及蠕變行為的影響。結(jié)果表明：與等溫鍛造合金相比，經(jīng)熱連軋后合金的晶粒尺寸較小，在等溫鍛造期間的變形特征僅為孿晶形變，而合金在熱連軋期間除產(chǎn)生孿晶外，在孿晶中還存在位錯(cuò)的雙取向滑移；采用不同工藝制備的合金均在{111}面上發(fā)生孿晶變形。在蠕變期間，熱連軋期間形成的位錯(cuò)可促進(jìn)孿晶內(nèi)發(fā)生位錯(cuò)的不同取向滑移，減緩應(yīng)力集中，提高合金蠕變抗力，致使合金在660 ℃、700 MPa條件下具有較長(zhǎng)蠕變壽命。
關(guān)鍵字: GH4169合金；熱連軋；孿晶；蠕變；變形特征
creep behaviors of GH4169 superalloy
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110178, China;
2. College of Light Industry, Liaoning University, Shenyang 110036, China;
3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China）
Abstract:By means of direct aging treatment, the creep properties measurement and microstructure observation of the isothermal forged (ITF) and hot continuous rolling (HCR) GH4169 alloys, the influence of the HCR on the microstructure and creep behavior of GH4169 alloy was investigated. The results show that the grain size of HCR alloy is finer than that of the ITF alloy. The only deformed feature of the ITF alloy is twinning. However, the twinning and dislocation slippings with double orientations in the twinning appear in the alloy during HCR. Moreover, the deformed twinnings occur on {111} planes in the alloys prepared by different technics. During creep, the dislocations formed during HCR can promote the dislocations slipping of different orientations within the twinning to decrease the stress concentration, which may enhance the creep resistance and result in longer creep lifetime of the alloy under the applied stress of 700 MPa at 660 ℃.
Key words: GH4169 superalloy; hot continuous rolling; twinning; creep; deformation feature
