Fan Menglong, Chen Chuanyong, Xuan Haijun, Qin Hailong, Qu Mingmin, Shi Songyi, Bi Zhongnan, Hong Weirong
High-Speed Rotating Machinery Laboratory, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China.
Beijing Key Laboratory of Advanced High-Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China.
Materials (Basel). 2022 Jul 28;15(15):5228. doi: 10.3390/ma15155228.
In this study, the effects of residual stress induced by three different cooling methods during heat treatment on the crack propagation behaviour of the GH4169 disc were investigated. Different levels of stress fields were induced to the specially designed discs by using air cooling (AC), air jetting cooling (AJC) and water quenching (WQ) methods and were quantitated by numerical simulation. These discs were then subjected to prefabricated cracking, and crack propagation tests were conducted on a spin tester with two load spectrums. Crack growth behaviour was depicted via the surface replica technique and fracture morphology. Regarding the linear superposition of residual stress and centrifugal force, the crack propagation behaviour of different discs was simulated using the FRANC3D software. AJC and WQ introduced compressive residual stress (-259 MPa and -109 MPa, respectively) into the disc compared with the AC method (about -1.5 MPa). The AJC method increases the crack propagation life of the disc by introducing residual compressive stress into the area near the surface of the central hole to inhibit the opening of the crack surface. When the fatigue load was low, this inhibition effect was more significant.
在本研究中，研究了热处理过程中三种不同冷却方法所诱导的残余应力对GH4169圆盘裂纹扩展行为的影响。通过空冷（AC）、气喷冷却（AJC）和水淬（WQ）方法，在专门设计的圆盘上诱导出不同水平的应力场，并通过数值模拟进行定量分析。然后对这些圆盘进行预制裂纹处理，并在具有两种载荷谱的旋转试验机上进行裂纹扩展试验。通过表面复型技术和断口形貌描绘裂纹扩展行为。关于残余应力和离心力的线性叠加，使用FRANC3D软件模拟了不同圆盘的裂纹扩展行为。与AC方法（约-1.5MPa）相比，AJC和WQ分别在圆盘中引入了压缩残余应力（分别为-259MPa和-109MPa）。AJC方法通过在中心孔表面附近区域引入残余压缩应力来抑制裂纹表面的张开，从而提高了圆盘的裂纹扩展寿命。当疲劳载荷较低时，这种抑制效果更为显著。
