GH4141合金高温拉伸性能及其损伤行为研究  

Study on the high-temperteraure tensile property and damage behavior in GH4141 superalloy

作　　者：张昭 裴丙红 冯旭 信瑞山 郭啸东 肖东平 周扬 Zhang Zhao;Pei Binghong;Feng Xu;Xin Ruishan;Guo Xiaodong;Xiao Dongping;Zhou Yang(Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China;State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan 114009,Liaoning,China;Pangang Group Jiangyou Changcheng Special Steel Co.,Ltd.,Jiangyou 621704,Sichuan,China;Chengdu Advanced Metal Materials Industrial Technology Institute Co.,Ltd.,Chengdu 610303,Sichuan,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102200 [2]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [3]攀钢集团江油长城特殊钢有限公司,四川江油621704 [4]成都先进金属材料产业技术研究院股份有限公司,四川成都610303

出　　处：《钢铁钒钛》2024年第1期152-157,共6页Iron Steel Vanadium Titanium

摘　　要：研究了室温、300℃和500℃环境下GH4141合金的拉伸性能,结果表明,合金高温下的抗拉强度明显低于室温,300℃和500℃拉伸结果表现出锯齿状的应力-应变曲线,并且两种高温环境下的抗拉强度相当。不同温度下断口附近的微观组织表征结果显示裂纹主要在晶界位置产生,无论晶界是否含有粗大MC型碳化物。M_(6)C和M_(23)C_(6)构成的链状碳化物使得晶界具有良好塑性,在断口表面形成大量的韧窝形貌。晶粒内部裂纹的产生与滑移带的形成密切相关,延缓滑移带的产生则归因于间隙元素、替代元素以及γ′强化析出相对位错的钉扎效应。注意到500℃环境下拉伸过程发生了再结晶现象,在粗大晶粒附近形成细小晶粒,并且伴随着少量碳化物,同时沿晶断裂现象明显减弱。然而,室温和300℃环境下的断口特征表现为穿晶和沿晶混合断裂模式,并未发生再结晶现象。This study focuses on the tensile properties of GH4141 superalloy tested at room temperature,300℃and 500℃,respectively.The tensile strength obtained at high temperatures of 300℃and 500℃with serrated stress-strain curves are lower than that obtained at room temperature.In addition,the tensile strength tested at 500℃is comparable to the value achieved at 300℃.The microstructure near the fracture surface of the superalloy is characterized.It is showed that cracks are formed at the grain boundary,irrespective of the observation of MC type carbides.The carbide composed of M_(6)C and M_(23)C_(6) with chain morphology endows grain boundary with a good plasticity which is reflected by numerous dimples in the fractographs.The initiation of cracks within the grains is associated with formation of slip bands.The activation of slip band can be delayed by dislocation pinning effect related to the interstitial elements,substituted elements and theγ′strengthening precipitate phase.It should be noted that recrystallization occurred during tensile testing at 500℃with a few carbides observed in the vicinity of fracture surface,while the intergranular fracture phenomenon was attenuated.However,the fractography of specimens tested at 300℃exhibit both intergranular and transgranular fracture without recrystallization.

关 键 词：GH4141合金 高温拉伸性能 动态应变时效 损伤 碳化物 

分 类 号：TG146.1[一般工业技术—材料科学与工程]