不同环境下05Cr17Ni4Cu4Nb钢超高周疲劳性能研究  

Ultra High Cycle Fatigue Performance Research of 05Cr17Ni4Cu4Nb Steel under Different Environment

作　　者：张晓东[1,2] 王佳薇 李清松 王天剑[1,2] 巩秀芳 张宏[3] ZHANG Xiaodong;WANG Jiawei;LI Qingsong;WANG Tianjian;GONG Xiufeng;ZHANG Hong(Dongfang Electric Corporation Dongfang Turbine Co.,LTD,Deyang Sichuan 618000;State Key Laboratory of Long-Life High Temperature Materials,Deyang Sichuan 618000;Sichuan University,Chengdu Sichuan,610000)

机构地区：[1]东方电气集团东方汽轮机有限公司,四川德阳618000 [2]长寿命高温材料国家重点实验室,四川德阳618000 [3]四川大学,四川成都610000

出　　处：《东方汽轮机》2022年第3期55-58,75,共5页Dongfang Turbine

摘　　要：采用超声振动疲劳试验机、SEM等手段,分别在室温、22%NaCl室温和95℃水蒸气的环境下,对895 MPa强度等级的05Cr17Ni4Cu4Nb钢进行超高周疲劳性能研究。研究结果表明,在109周次寿命循环下,该材料在三种环境下的疲劳极限分别为490 MPa、460 MPa和360 MPa。对断口进行SEM分析,发现95℃水蒸汽环境下对材料疲劳失效断口特征影响较小。而在22%NaCl环境下会在材料表面凹凸处产生局部腐蚀,造成裂纹易于从此处萌生,降低疲劳寿命。Ultra high cycle fatigue performance of 895 MPa strength grade 05Cr17Ni4Cu4Nb stainless steel under the room temperature,22%NaCl condition and 95℃vapour respectively were investigated by using ultrasonic vibration fatigue testing machine and SEM.The result reveals that in the above three conditions,the fatigue limit of this material is respectively 490 MPa,460 MPa and360 MPa under the 109 life cycle times.By SEM analyzing the fracture,the conclusion shows that 95℃vapour has little effect on fracture characteristics of the material fatigue fracture.Whereas local corrosion will occur on the concave and convex surface of the material in the 22%NaCl environment,which results in the initiation of cracks and reduces the fatigue life.

关 键 词：末级叶片 05Cr17Ni4Cu4Nb钢 超高周疲劳 22%NaCl 95℃水蒸气 

分 类 号：TK266[动力工程及工程热物理—动力机械及工程]