擠壓態(tài)GH3625合金冷變形過(guò)程中的組織和織構(gòu)演變

擠壓態(tài)GH3625合金冷變形過(guò)程中的組織和織構(gòu)演變EVOLUTION of TEXTURE and MICROSTRUCTURE DURING COLD DEFORMATION of HOT-EXTRUDED GH3625 SUPERALLOY

采用電子背散射衍射(EBSD)技術(shù)研究了擠壓態(tài)GH3625合金冷變形過(guò)程中的組織演變、晶界分布特征、位錯(cuò)密度、應(yīng)力分布及織構(gòu)演變規(guī)律。結(jié)果表明，隨著冷變形量的增加，晶粒變形程度加大，晶粒形貌由扁平狀轉(zhuǎn)為細(xì)條狀，晶體轉(zhuǎn)動(dòng)使得晶界與加載壓力軸垂直分布；隨著冷變形的增加，大角度晶界逐漸向小角度晶界轉(zhuǎn)變，孿晶界的比例逐漸增加。隨著冷變形的增加，局部取向差的平均值 升高，位錯(cuò)密度增加；隨著冷變形的增加，晶粒變形均勻性逐漸變好，應(yīng)力集中分布逐漸向應(yīng)力均勻分布轉(zhuǎn)變。隨著冷變形量的增加，其形變織構(gòu)的類(lèi)型基本保持不變，而具有穩(wěn)定取向的Copper織構(gòu){112}<111>的強(qiáng)度略有降低；同時(shí)，由不均勻變形產(chǎn)生的Rotated-cube織構(gòu){001}<110>的強(qiáng)度降低；此外，形變孿晶的形成導(dǎo)致Goss織構(gòu){110}<001>和Brass-R織構(gòu){111}<112>的強(qiáng)度降低。

GH3625 alloy is a wrought nickel-based superalloy mainly used in aeronautical, aerospace, chemical, nuclear, petrochemical, and marine applications industry due to its good combination of mechanical properties and corrosion resistance on prolonged high-temperature exposure to aggressive environments. However, the cold deformation microstructure directly determines the microstructure of the alloy pipe, thereby affecting the performance of the alloy pipe. In this work, the microstructure evolution, grain boundary distribution characteristics, dislocation density, stress distribution and texture evolution of the hot-extruded GH3625 superalloy during cold deformation were investigated by electron backscatter diffraction (EBSD) technique. The results show that with the increase of cold deformation, the degree of grain deformation increases, and the grain morphology changes from flat to thin strip. The rotation of the crystal causes the grain boundary to be perpendicular to the loading pressure axis. With the increase of cold deformation, the HAGBs gradually changes to the LAGBs, and the proportion of twin grain boundary increases gradually. The average value of local orientation increases with the increase of cold deformation, which can reflect density of dislocation increasing. With the increase of cold deformation, the uniformity of grain deformation gradually becomes better, and the stress concentration distribution gradually changes to the uniform distribution of stress. With the cold deformation increases, the type of deformation texture remains basically unchanged, while the strength of the Copper texture {112}<111> with stable orientation is slightly reduced. Meanwhile, the Rotated-cube texture {001}<110> generated by inhomogeneous plastic deformation is reduced in strength. In addition, the formation of deformation twin results in a decrease in the strength of the Goss texture {110}<001> and the Brass-R texture {111}<112>.

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