新聞資訊
熱連軋對GH4169合金蠕變行為的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時間：2015-12-05
通過對等溫鍛造和熱連軋工藝制備的GH4169合金進行直接時效、蠕變性能測試和組織形貌觀察，研究熱連軋對GH4169合金組織結構及蠕變行為的影響。
熱連軋對GH4169合金蠕變行為的影響Influence of hot continuous rolling on?creep behaviors of GH4169 superalloy
通過對等溫鍛造和熱連軋工藝制備的GH4169合金進行直接時效、蠕變性能測試和組織形貌觀察，研究熱連軋對GH4169合金組織結構及蠕變行為的影響。結果表明：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可促進孿晶內(nèi)發(fā)生位錯的不同取向滑移，減緩應力集中，提高合金蠕變抗力，致使合金在660 ℃、700 MPa條件下具有較長蠕變壽命。
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 ℃.
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