摘要
面向未来煤炭清洁高效利用的发展需求,开展了先进超超临界汽轮机转子用C700R-1镍基合金转子锻件的研制,并对试制的转子锻件进行了常规力学性能和短时持久性能的检测。结果表明,采用闭式镦粗+挤压的方式可以实现Φ850 mm锻件的高均质化锻造。研制的大截面锻件锻态晶粒度在4~7级,热处理后的晶粒度在3级左右。由于边缘部位固溶后冷却速率高,后续时效过程中可析出大量均匀细小的γ′相。因此,锻件边缘拉伸性能略优于心部和1/2R。边缘位置不同方向拉伸性能波动很小。锻件室温抗拉强度>950 MPa,屈服强度>600 MPa,冲击功AKV>70 J;700℃抗拉强度>750 MPa,屈服强度>500 MPa。室温和700℃的伸长率和断面伸缩率均在25%以上。锻件在700℃/300 MPa条件下的持久时间>7000 h。本课题通过闭式镦粗+挤压的变形方式以及合理的热处理工艺,实现了Φ850 mm截面等级镍基合金锻件的均质化制造,为后续全尺寸镍基合金转子锻件的制造提供了关键数据。
To address the evolving demands for the clean and efficient utilization of coal,efforts have been devoted to the research and development of C700R-1 nickel-based alloy rotor forgings for advanced ultra-supercritical steam turbine rotors.Concurrently,tests are conducted on the conventional mechanical properties and creep rupture properties of the trial-manufactured rotor forgings.The results show that the use of the closed upsetting+extrusion method enables the high-homogeneity forging ofΦ850 mm forgings.The as-forged grain size of the developed large-section forgings ranges from grade 4 to grade 7,and the grain size after heat treatment is approximately grade 3.Due to the rapid cooling rate of the edge parts after solid solution,a large number of uniform and fine γ′phases precipitate in the subsequent aging process.Therefore,the tensile properties of edge position are slightly better than those of the heart and 1/2R position.The variation of tensile properties in different directions of edge position is small.The room temperature tensile strength can reach 950 MPa,the yield strength can reach 600 MPa,and the V-notch absorbed energy at room temperature is beyond 70 J at different positions after heat treatment.The tensile strength can reach 750 MPa,yield strength can reach 500 MPa at 700℃.The plasticity is higher than 25%at room temperature and 700℃.The creep life exceeds 7000 h in the condition of 700℃/300 MPa.Through the deformation mode of closed upsetting+extrusion and reasonable heat treatment process,the homogenization manufacturing of nickel base alloy forgings with a section grade ofΦ850 mm,which provides key data for the subsequent manufacturing of full-size nickel base alloy rotor forgings.
作者
白亚冠
聂义宏
张鑫
寇金凤
郭伟
李红梅
张冰冰
曹志远
王宝忠
BAI Yaguan;NIE Yihong;ZHANG Xin;KOU Jinfeng;GUO Wei;LI Hongmei;ZHANG Bingbing;CAO Zhiyuan;WANG Baozhong(Tianjin Heavy Industries Research&Development Co.,Ltd.,Tianjin 300457,China;China First Heavy Industries,Qiqihar 161042,Heilongjiang,China;Heilongjiang Provincial Key Laboratory of Intelligent Manufacturing for Advanced Nuclear Power Equipment,Qiqihar 161042,Heilongjiang,China)
出处
《材料工程》
北大核心
2025年第11期72-79,共8页
Journal of Materials Engineering
基金
国家重点研发计划基金项目(2021YFB3704102)
2021年国家新材料应用示范平台项目(TC210H022)
黑龙江省自然科学基金项目(JQ2021E007)。
关键词
先进超超临界
转子
C700R-1
镍基合金
挤压
力学性能
advanced ultra-supercritical
rotor
C700R-1
nickel-based alloy
extrusion
mechanical property
