617镍基合金蠕变-疲劳交互力学行为与微观组织演变

doi:10.3901/JME.2022.08.170

摘要/Abstract

摘要： 对先进超超临界汽轮机转子侯选材料617镍基合金进行725℃不同拉伸应变保持时间的蠕变-疲劳交互试验，对4个应变保持时间下的试样力学行为和微观组织进行比较分析。结果表明，在短时间应变保持下的蠕变-疲劳失效机制是疲劳裂纹和氧化空洞及氧化晶界的连接贯通引发的沿晶破坏；随着应变保持时间增加，晶界抗氧化性和晶界及晶内强度提高，合金抵抗蠕变和裂纹扩展的能力增强；失效循环次数降低，但总运行时间增加。对不同应变保持时间的裂纹形态、组织缺陷、碳化物和析出相的演变以及不同形态的γ'相的形成机制进行了讨论，揭示了617镍基合金蠕变-疲劳交互力学行为与组织演变的相互影响机理，为先进超超临界汽轮机机组高温部件选材和使用提供参考。

关键词: 蠕变疲劳交互, 显微组织, γ'相演变, 镍基合金, 先进超超临界汽轮机

Abstract: Creep-fatigue test strain-controlled with different tensile strain holding times at 725℃ were done on Nickel-based superalloy 617 as a typical candidate material for turbine rotor using an advanced ultra super critical power plant. The mechanical behavior and microstructure evolution under 4 strain holding times were compared and analyzed. The results show that creep-fatigue failure mechanism under short-time strain holding is intergranular failure caused by the connection of fatigue cracks and oxidized cavities and oxidized grain boundaries. As the strain holding time increases,the grain boundary oxidation resistance and the intergranular and intragranular strength increase,and the ability to resist creep and crack propagation increases.The number of 617 creep-fatigue failure cycles decreases while the total running time increases. The crack morphology,microstructure defects,the evolution of carbides and precipitated phases and the formation mechanisms of different γ' phases were discussed. It revealed the influence mechanism between creep-fatigue interactive mechanical behavior and microstructure evolution of 617 Nickel-based alloy,which provides reference for the selection and use of high-temperature components of A-USC turbine units.

Key words: creep-fatigue interaction, microstructures, γ' phase evolution, Nickel-based superalloy, A-USC power plant

中图分类号:

TG113

吴海利, 张长春, 孙林根, 徐倩虹. 617镍基合金蠕变-疲劳交互力学行为与微观组织演变[J]. 机械工程学报, 2022, 58(8): 170-180.

WU Haili, ZHANG Changchun, SUN Lingen, XU Qianhong. Creep-Fatigue Interaction Behaviors and Microstructure Evolution of Ni-based Superalloy 617[J]. Journal of Mechanical Engineering, 2022, 58(8): 170-180.

参考文献

[1] 陈学文,何阿平,阳虹,等.高超超临界汽轮机开发的关键技术及实施路线[J].热力透平,2012,41(2):89-96. CHEN Xuewen,HE Aping,YANG Hong,et al. Key technologies and program implementation for development of high USC steam turbines[J]. Thermal Turbine,2012,41(2):89-96.
[2] 黄瓯,彭泽瑛. 700℃高超超临界技术的经济得益分析[J].热力透平,2010,39(3):170-174. HUANG Ou,PENG Zeying. Economy of 700℃ high USC technology[J]. Thermal Turbine,2010,39(3):170-174.
[3] 徐炯,周一工. 700℃高效超超临界技术的发展[J].中外能源,2012,17(6):13-17. XU Jiong,ZHOU Yigong. The development of 700℃ USC technology[J]. Sino-Global Energy,2012,17(6):13-17.
[4] 王会阳,安云岐,李承宇,等.镍基高温合金材料的研究进展[J].材料导报,2011,25(18):482. WANG Huiyang,AN Yunqi,LI Chengyu,et al. Research progress of Ni-based superalloys[J]. Materials Review,2011,25(18):482.
[5] 田仲良,包汉生,何西扣,等. 700℃汽轮机转子用耐热合金的研究进展[J].钢铁,2015,50(2):54-69. TIAN Zhongliang,BAO Hansheng,HE Xikou,et al. Research development on the heat resistant alloy used for 700℃ USC turbine rotor[J]. Iron and Steel,2015,50(2):54-69.
[6] 杨华春,林富生,谢锡善,等.欧洲700℃发电机组研发及617合金研究进展[J].发电设备,2012,26(5):355-359. YANG Huachun,LIN Fusheng,XIE Xishan,et al. R&P progress of 700℃ power generation technology and alloy 617 in eurpe[J]. Power Equipement,2012,26(5):355-359.
[7] 王天剑,范华,张邦强,等. 700℃超超临界汽轮机关键部件用镍基高温合金选材[J].东方汽轮机,2012(2):46-53. WANG Tianjian,FAN Hua,ZHANG Bangqiang,et al. Nickel-based superalloy for key components of ultra-supercritical steam turbine operating above 700℃[J]. Dongfang Turbine,2012(2):46-53.
[8] MARTINO S,FAULKNER R,HOGG S,et al. Characterisation of microstructure and creep properties of alloy 617 for high-temperature applications[J]. Materials Science&Engineering A,2014(619):77-86.
[9] 郭岩,王彩侠,李太江,等. 700℃超超临界机组用617B镍基合金的组织结构和析出相[J].材料研究学报,2016,30(11):841-847. GUO Yan,WANG Caixia,LI Taijiang,et al. Microstructure and precipitates of alloy 617B used for 700℃ advanced ulta-supercritical power units[J]. Chinese Journal of Materials Research,2016,30(11):841-847.
[10] 李季,郭岩,周荣灿,等. Alloy 617B合金蠕变行为及变形过程中的显微组织演化[J].中国电机工程学报,2017,37(7):2040-2045. LI Ji,GUO Yan,ZHOU Rongcan,et al. Creep deformation behavior of alloy 617B and the corresponding microstructural evolution[J]. Proceedings of the CSEE,2017,37(7):2040-2045.
[11] 向雪梅,董建新,江河,等. 617B镍基高温合金长期时效组织演变[J].稀有金属材料与工程,2019,48(3):865-871. XIANG Xuemei,DONG Jianxin,JIANG He,et al. Microstructure evolution of 617B Ni-based superalloy during long-term aging[J]. Rare Metal Materials and Engineering,2019,48(3):865-871.
[12] 江河,董建新,张麦仓,等. 700℃超超临界锅炉管用617B合金时效组织演变[J].稀有金属材料与工程,2016,45(4):982-989. JIANG He,DONG Jianxin,ZHANG Maicang,et al. Microstructure evolution during aging of alloy 617B for 700℃ ultra-supercritical boiler pipe[J]. Rare Metal Materials and Engineering,2016,45(4):982-989.
[13] 崔璐,石红梅,李臻,等.先进汽轮机转子材料蠕变疲劳损伤研究新进展[J].机械强度,2018,40(2):449-454. CUI Lu,SHI Hongmei,LI Zhen,et al. New progress in research on damage for creep fatigue of modern turbine rotor[J]. Journal of Mechanical Strength,2018,40(2):449-454.
[14] 宫建国,温建锋,轩福贞.蠕变-疲劳载荷下高温结构的缺口效应研究进展[J].机械工程学报,2015,51(24):24-40. GONG Jianguo,WEN Jianfeng,XUAN Fuzhen. Research progress on notch effect of high temperature components under creep-fatigue loading[J]. Journal of Mechanical Engineering,2015,51(24):24-40.
[15] KOBAYASHI,HAYAKAWA,KIMURA. Creep-fatigue interaction properties of nickel-based superalloy 617[J]. Acta Metal Sin.,2011,24(2):125-131.
[16] ASTM E2714. Standard test method for creep-fatigue testing[S]. West Conshohocken:ASTM International,2009.
[17] 谢君,于金江,孙晓峰,等.高钨K416B铸造镍基合金高温蠕变期间碳化物演化行为[J].金属学报,2015,51(4):458. XIE Jun,YU Jinjiang,SUN Xiaofeng,et al. Carbide evolution behavior of K416B as-casting Ni-base superalloy with high W content during high temperature creep[J]. Acta Metal Sin.,2015,51(4):458.
[18] 张凯,师梦杰,郑合凤,等. Inconel617合金中第二相的析出规律研究[J].原子能科学技术,2019,53(12):2428-2434. ZHANG Kai,SHI Mengjie,ZHANG Hefeng,et al. Precipitation mechanism of secondary phase in Inconel 617 alloy[J]. Atomic Energy Science and Technology,2019,53(12):2428-2434.
[19] 李会芳. A-USC镍基合金组织演化及蠕变变形影响研究[D].大连:大连理工大学,2019. LI Huifang. Research on the microstructure evolution of A-USC Ni-based superalloy and the effect of creep deformation[D]. Dalian:Dalian University of Technology,2019.
[20] 李玉清,刘锦岩.高温合金晶界间隙相[M].北京:冶金工业出版社,1990. LI Yuqing,LIU Jianyan. Interstitial phase in superalloy[M]. Beijing:Metallurgical Industry Press,1990.
[21] 胡赓祥,蔡珣,戎咏华.材料科学基础[M].上海:上海交通大学出版社,2006. HU Gengxiang,CAI Xun,RONG Yonghua. Fundamentals of materials science[M]. Shanghai:Shanghai Jiao Tong University Press,2006.
[22] 陈大钦,郑子樵,李世晨,等.共格沉淀析出过程的模拟I-微观结构演化[J].中国有色金属学报,2005,15(12):1945-1952. CHEN Daqin,ZHENG Ziqiao,LI Shichen,et al. Simulation of precipitation process of coherent particles I-microstructure evolution[J]. The Chinese Journal of Nonferrous Metals,2005,15(12):1945-1952.
[23] 肖纪美.合金相与相变[M].北京:冶金工业出版社,2004. XIAO Jimei. Alloy phase and phase transformation[M]. Beijing:Metallurgical Industry Press,2004.
[24] 饶思贤,彭辉,周煜,等. TP347H的高温蠕变-疲劳交互规律[J].机械工程学报,2015,51(2):37-42. RAO Sixian,PENG Hui,ZHOU Yu,et al. Interactions between creep and fatigue of TP347H under high temperature[J]. Journal of Mechanical Engineering,2015,51(2):37-42.
[25] 吴生华.定向凝固镍基高温合金4706DS的蠕变疲劳机理研究[D].厦门:厦门大学,2014. WU Shenghua. Creep-fatigue mechanism research of the directionally solidified Nickel-base superalloy 4706DS[D]. Xiamen:Xiamen University,2014.
[26] 郭建亭,袁超,侯介山.高温合金的蠕变及疲劳-蠕变-环境交互作用规律和机理[J].中国有色金属学报, 2011,21(3):487-503. GUO Jianting,YUAN Chao,HOU Jieshan. Creep and creep-fatigue-environment interaction and mechanisms of superalloys[J]. The Chinese Journal of Nonferrous Metals,2011,21(3):487-503.