C含量对GH4169合金显微组织及力学性能的影响  

Effect of C Content on Microstructure and Mechanical Properties of GH4169 Alloy

作　　者：石照夏 胥国华[1,2] 刘宁 田伟[4] 陈嘉诚 汤忖江 朱岩 张连杰 Shi Zhaoxia;Xu Guohua;Liu Ning;Tian Wei;Chen Jiacheng;Tang Cunjiang;Zhu Yan;Zhang Lianjie(Gaona Areo Materials Co.,Ltd,Beijing 100081,China;Beijing Key Laboratory of Advanced High Temperature Materials,Central Iron and Steel Research Institute,Beijing 100081,China;Fushun Special Steel Co.,Ltd,Fushun 113001,China;AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China;CGNPC Uranium Resources Co.,Ltd,Beijing 100029,China)

机构地区：[1]北京钢研高纳科技股份有限公司,北京100081 [2]钢铁研究总院高温合金新材料北京市重点实验室,北京100081 [3]抚顺特殊钢股份有限公司,辽宁抚顺113001 [4]中国航发四川燃气涡轮研究院,四川成都610500 [5]中广核铀业发展有限公司,北京100029

出　　处：《稀有金属材料与工程》2023年第8期2926-2934,共9页Rare Metal Materials and Engineering

摘　　要：为了研究C元素含量对GH4169合金显微组织及力学性能的影响,采用真空感应熔炼、均匀化热处理、锻造和固溶处理得到C质量分数分别为0.025%、0.044%和0.072%的3种GH4169合金,通过热力学计算和差示扫描量热法研究了不同C含量GH4169合金的平衡相析出行为,并结合显微组织观察、X射线衍射相分析和室温拉伸试验,分析了C含量对GH4169合金显微组织、室温拉伸性能和加工硬化指数的影响。结果表明:C含量的增加会促进GH4169合金中MC和M_(23)C_(6)碳化物的析出,富Nb的MC碳化物含量随C含量的增加呈线性趋势增加。C含量的增加会抑制δ相的析出,对γ′相的析出无显著影响。随C含量的增加,固溶态GH4169合金的晶粒得到细化,室温强度升高,断后伸长率降低,加工硬化指数降低,均匀塑性变形能力降低。MC碳化物及其引起的微孔是导致合金室温拉伸断裂的主要原因。In order to investigate the effect of C content on microstructure and mechanical properties of GH4169 alloy,three kinds of GH4169 alloys were obtained by vacuum induction melting,homogenization heat treatment,forging and solid solution heat treatment.The content of C was 0.025wt%,0.044wt%and 0.072wt%.The precipitation behaviors of equilibrium precipitated phases of GH4169 alloy with different C contents were investigated by thermodynamic calculation and differential scanning calorimetry.Combined with microstructure observation,X-ray diffraction phase analysis and tensile test at room temperature of alloys with different C contents,the effect of C content on the tensile properties at room temperature and strain hardening exponent was analyzed.The results show that the increase in C content can promote the precipitation of MC carbide and M_(23)C_(6)carbide.The amount of MC carbide enriched with Nb increases linearly with the increase in C content.The increase in C content can inhibit the precipitation ofδphase and has no significant influence on the precipitation ofγ′phase.With the increase in C content,the grain of solid-solution state is refined and the strength at room temperature is improved.The increase in C content will decrease the elongation after fracture,strain hardening exponent and the capacity of uniform plastic deformation.MC carbide and its resulting void are the main factors to cause the fracture of the alloy at room temperature.

关 键 词：GH4169合金 C元素含量 显微组织 MC碳化物 力学性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]