黄友桥,王飞,彭以超,楼玉民
HUANG Youqiao,WANG Fei,PENG Yichao,LOU Yumin

• 1:浙江浙能兰溪发电有限责任公司
• 2:浙江浙能技术研究院有限公司

摘要(Abstract)：

兰溪发电厂汽轮机高、中压内缸螺栓采用镍基超高温合金作为紧固件材料,螺栓在机组高温运行时发生了断裂。对断裂失效的Nimonic 80A螺栓进行了宏观检查、超声检测、光谱分析、金相分析以及力学性能分析,查阅Nimonic 80A螺栓的材料特性,分析后得出:螺栓断裂可能与该材料在500℃以下产生负蠕变、螺栓晶粒大小不均匀并呈带状组织以及应力腐蚀等因素有关。
Nickel based superalloys are used as fastening bolts for high and medium pressure inner cylinder of steam turbine in Lanxi power plant. The bolts fractured in high temperature operation of units. Macroscopic examination, ultrasonic detection, spectrum analysis, metallographic analysis and mechanical performance analysis on the fractured Nimonic 80 A bolts were conducted. By referring to material property of Nimonic80 A bolts, the paper concludes that the bolt fracture results from negative creep under 500 ℃, uneven crystal grain of bolt and the banded structure as well as stress corrosion.

关键词(KeyWords)： 汽轮机;Nimonic80A螺栓;失效;材料
steam turbine;Nimonic 80A bolt;failure;material

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 黄友桥,王飞,彭以超,楼玉民
HUANG Youqiao,WANG Fei,PENG Yichao,LOU Yumin

DOI: 10.19585/j.zjdl.201805016

参考文献(References)：

• [1]郭建亭.高温合金材料学(上册)应用基础理论[M].北京:科学出版社,2008.
• [2]徐裕来.超超临界汽轮机叶片用高温合金Nimonic 80A成分优化、微结构及其高温强化机理研究[D].上海:上海大学,2013.
• [3]栢宇.Nimonic80A性能影响因素探讨[J].特钢技术,2008,56(14):24-25.
• [4]姜涛,王建光.超超临界机组镍基螺栓断裂失效分析[J].热力发电,2016(1):3-5.
• [5]廖景娱.金属构件失效分析[M].北京:化学工业出版社,2003.
• [6]刘新灵,张峥,陶春虎.疲劳断口定量分析[M].北京:国防工业出版社,2010.
• [7]陈小林.镍基高温合金GH4145/SQ螺栓寿命预测[J].浙江电力,2005,24(2):2-4.
• [8]XU YULAI,YANG CAIXIONG.Strengthening behavior of Al and Ti elements at room temperature and high temperature in modified Nimonic 80A[J].Materials Chemistry and Physics,2012(6):6-11.
• [9]赵中平.再论汽轮机高温螺栓材料的选择[J].动力工程,1999,19(2):6-7.
• [10]WILTHAN B,TANZER R,SCH譈TZENH魻FER W,et al.Thermophysical properties of the Ni-based alloy Nimonic80A up to 2 400 K[J].Rare Metals,2006(6):10-13.
• [11]王延庆.镍基高温合金中γ′相的高温稳定性及筏状结构的形成[J].钢铁研究学报,1996(1):3-7.
• [12]杨旭.一种单晶高温合金中γ′相的析出行为[J].科学技术与工程,2011(15):2-5.
• [13]P魪REZ M.Microstructural evolution of Nimonic 80a during hot forging under non-isothermal conditions of screw press[J].Journal of Materials Processing Tech.,2018(2):14-20.
• [14]QUAN GUOZHENG.Correspondence between grain refinements and flow softening behaviors at Nimonic 80Asuperalloy under different strain rates,temperatures and strains[J].Materials Science&Engineering A,2017(6):22-26.
• [15]AUERKARI P,HALD J.Baltica VII:Life management and maintenance for power plants[J].Energy Materials,2007,2(2):65-65.
• [16]METCALFE E,NATH B,WICKENS A.Some effects of the ordering transformation in Nimonic 80A on stress relaxation behaviour[J].Materials Science&Engineering,1984,67(2):157-162.
• [17]高冠群,郭磊,张鑫.抽水蓄能机组转轮的疲劳寿命预估方法研究[J].浙江水利水电学院学报,2016,28(2):17-21.