GH4698高温合金冷拉拔过程中的微观组织演变和再结晶  

Microstructural evolution and recrystallization of GH4698 superalloy during cold drawing

作　　者：李健[1] 王资兴 王安东[1] LI Jian;WANG Zi-xing;WANG An-dong(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212000,China;Jiangsu Jicui Advanced Metal Materials Research Institute Co Ltd,Suzhou 215500,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212000 [2]江苏集萃先进金属材料研究所有限公司,江苏苏州215500

出　　处：《材料热处理学报》2025年第2期140-151,共12页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52175464)。

摘　　要：利用光学显微镜、扫描电镜、电子背散射衍射技术、透射电镜、显微硬度仪和拉伸试验机等对GH4698合金在冷拉拔变形过程中的微观组织和性能进行研究,并分析了合金热处理后的再结晶形核机制。结果表明:在冷拉拔过程中,合金的硬度从表面到中心逐渐增加,并且随着变形量的增加,硬度分布逐渐均匀,这是应变分布和微观结构共同作用的结果;随变形量的增加,合金的拉伸强度得到提高,而塑性相应降低。晶粒取向由最初的随机分布逐渐转变为沿[001]-[111]方向排列;固溶温度对合金的再结晶行为有显著影响。当变形量为36.0%,并在1020℃保温1 h时,合金几乎完全再结晶;TEM和EBSD分析表明,应变影响合金的再结晶形核机制,合金的再结晶机制以晶界迁移形核为主,亚晶长大形核为辅。Microstructure and properties of GH4698 alloy during cold drawing deformation were studied by means of optical microscope,scanning electron microscopy,electron backscatter diffraction(EBSD) technique,transmission electron microscopy(TEM),microhardness tester and tensile testing machine,and the recrystallization nucleation mechanism of the alloy after heat treatment was analyzed.The results show that during the cold drawing,the hardness of the alloy gradually increases from the surface to the center,and with the increase of deformation,the hardness distribution gradually becomes uniform,which is the result of the combined effect of strain distribution and microstructure.With the increase of deformation,the tensile strength of the alloy is improved,while the plasticity is correspondingly reduced.The grain orientation gradually changes from an initial random distribution to an arrangement along the [001]-[111] direction.The solution temperature has a significant affect on the recrystallization behavior of the alloy.When the deformation is 36.0% and holding at 1020 ℃ for 1 h,the alloy almost completely recrystallizes.TEM and EBSD analysis show that strain affects the recrystallization nucleation mechanism of the alloy,with grain boundary migration nucleation being the main recrystallization mechanism and subgrain growth nucleation being the secondary one.

关 键 词：GH4698高温合金 冷拉拔 再结晶 

分 类 号：TG132.3[一般工业技术—材料科学与工程]