GH4706合金涡轮盘锻件不同部位的组织及高温力学性能  

Microstructure and High-temperature Mechanical Properties of Different Positions of Turbine Disc Forgings in GH4706 Superalloy

作　　者：徐烨玲 王冲 侯翔益 黄嘉良 廉心桐 黄烁 Xu Yeling;Wang Chong;Hou Xiangyi;Huang Jialiang;Lian Xintong;Huang Shuo(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110004,China;Gaona Aero Material Co.,Ltd.,Beijing 100081,China;Zhejiang Institute of Advanced Materials,SHU,Jiaxing 314100,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]东北大学材料科学与工程学院,沈阳110004 [3]北京钢研高纳科技股份有限公司,北京100081 [4]上海大学(浙江)高端装备基础件材料研究院,嘉兴314100

出　　处：《特殊钢》2024年第5期102-107,共6页Special Steel

基　　金：国家重点研发计划(2022YFB3705104)。

摘　　要：为了研究GH4706涡轮盘不同部位的组织及高温力学性能差异性,基于典型服役性能要求,开展了400、500、600、650℃条件下的高温拉伸,400、500、600℃条件下的高温低周疲劳和650℃/690 MPa、600℃/700 MPa的高温持久寿命对比分析。试验结果表明,轮毂、辐板及轮缘位置的晶粒组织存在显著差异,其中轮毂晶粒度为4级(平均晶粒尺寸为84μm),辐板晶粒度为3级(平均晶粒尺寸为120μm),轮缘晶粒度为2级(平均晶粒尺寸为183μm)。不同部位试样的γ′-γ″复合相均以球状弥散析出。轮毂和辐板位置的η相呈长针状,尺寸较大,且与晶界平行分布;轮缘部位的η相呈短棒状析出,尺寸较小,在晶界的排列比较分散。不同位置的高温拉伸强度无明显差异,轮毂部位的低周疲劳性能最优(4363循环周次),而轮缘部位的高温拉伸塑性和持久寿命最优(1259 h)。GH4706涡轮盘锻件不同部位的组织差异性对其高温力学性能的影响较为显著。In order to study the differences in microstructure and high temperature properties of different positions of turbine disc forging in GH4706 alloy,comparative analysis of mechanical properties at high temperature were carried out.Detailed experiments included high-temperature tensile property(conducted at the temperature of 400℃,500℃,600℃and 650℃),high-temperature low-cycle fatigue(conducted at the temperature of 400℃,500℃and 600℃)and hightemperature stress rupture life(conducted at the condition of 650℃/690 MPa and 600℃/700 MPa)based on typical service performance requirements.The test results showed that the grain sizes of the hub,spoke and rim varied significantly,with the hub grain size level 4(average grain size 84μm),spoke grain size level 3(average grain size 120μm)and rim grain size level 2(average grain size 183μm).Theγ′-γ″composite of the samples in different positions were dispersed in spherical shape.Theηphase of hub and plate is in needle shape,with larger size,and distributed parallel to grain boundaries.Theηphase of rim precipitates in the shape of short rods with smaller size and dispersed arrangement at grain boundaries.There was no significant difference in high-temperature tensile strength at different locations.However,the samples from hub had excellent low-cycle fatigue performance(4363 cycle number),while the tensile plasticity and stress rupture life of rim was the longest(1259 h).The study indicated that the variation of microstructure from different positions of turbine disc forging in GH4706 alloy had significant effects on mechanical properties.

关 键 词：GH4706合金 涡轮盘 晶粒度 高温力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金]