【作者】 王建国； 王连庆； 王红缨； 康永林；

【Author】 WANG Jian-guo,WANG Lian-qing,WANG Hong-ying,KANG Yong-lin (State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)

【机构】 北京科技大学新金属材料国家重点实验室；

【摘要】 对GH4169镍基高温合金制成的薄壁圆管试样的多轴循环相关特性进行了研究。试验在MTS809-250 kN/2000Nm电液伺服拉-扭低周疲劳试验机上进行,采用恒幅总应变控制,对称加载,轴向应变与扭转应变的加载采用三种不同相位(0°、45°和90°),其加载频率分别为0.1 Hz和0.2 Hz,试验温度为650℃.通过对薄壁圆管高温多轴比例和非比例循环加载试验,研究了该材料在多轴循环载荷下的应力-应变响应和循环相关特性。试验结果表明,GH4169合金在试验温度下不通加载路径下均呈现为循环软化现象,其循环软化程度与等效应变和轴向与剪切方向之间的相位差密切相关。更多还原

【Abstract】 Experiments were performed on thin-walled tubular specimen of GH4169 superalloy in combined tension-compression and torsion loading to investigate cyclic properties.Full reversed axial,torsional strain controlled fatigue testes were conducted on GH4169 superalloy at high temperature 650℃by using a MTS 809 tension-torsional servocontrolled electro-hydraulic testing machine and a data acquisition system.The phase between axial strain and torsional strain were and 0°in-phase and 45°,90°out-of-phase respectively.The axial and torsional fatigue tests were performed under full reversed strain cycling at constant amplitudes,and the waveform were triangular and sinusoidal respectively. The equivalent strain frequency was maintained at 0.1 and 0.2 Hz.Based on the test results,the cyclic performance of stress-strain under multi-axial fatigue was investigated.The results show that GH4169 is the material of cyclic softening under different loading path at 650℃,and the rate of cyclic softening were dependent on the effective strain amplitude and the phase between axial strain and torsional strain.更多还原