文献类型：期刊文献

英文题名：Surface strengthening in confined spaces: A novel deflecting abrasive waterjet peening for improving the surface integrity of nickel-based superalloys GH4169

作者：Yao, Shu-Lei[1];Li, Wei[2,3];Wang, Jia-Shu[1];Zeng, Fei[2,3];Wang, Gong-Yu[1];Chi, Yu-Xin[1];Wang, Ning[1];Liu, Shuang[1];Zhang, Xian-Cheng[1,4]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]AECC Hunan Aviat Powerplant Res Inst, Zhuzhou 412002, Peoples R China;[3]AECC Hunan Aviat Powerplant Res Inst, Hunan Key Lab Turbomachinery Small & Medium Aeroen, Zhuzhou 412002, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2023

卷号：85

起止页码：417

外文期刊名：JOURNAL OF MANUFACTURING PROCESSES

收录：;EI(收录号：20225113262898);WOS:【SCI-EXPANDED(收录号:WOS:000899074700001)】；

基金：This work was supported financially by the National Natural Science Foundation of China (Nos. U21B2077 and 51725503) , Innovation Pro- gram of Shanghai Municipal Education Commission (2019-01-07-00-02- E00068) and 111 Project.

语种：英文

外文关键词：Deflecting abrasive waterjet peening; Confined space; Deflecting nozzle; Processing parameters; Surface integrity

摘要：Abrasive waterjet peening (AWJP) has become an essential surface treatment technique to improve the surface integrity and mechanical properties of metallic parts due to its high controllability and small thermal influence. However, since existing AWJP processes are based on straight nozzles, they are difficult for complex geometrical profiles and confined spaces treatment, such as dovetail slots. In the present work, a novel deflecting AWJP (DAWJP) process with a designed deflecting nozzle was proposed and verified by experiments on the nickel -based superalloy GH4169. First, the DAWJP's deflecting nozzle was designed based on the AWJP's straight nozzle and deflecting pin with deflection angle. Second, the internal and external flow field distribution and abrasive movement state of deflecting nozzles with different deflection angles (R = 0, 1, 1.5, 2 mm) were studied by using the FLUENT CFD software. Finally, the surface integrity of the GH4169 specimen treated by the pro-posed DAWJP with an optimized deflecting nozzle was investigated, including microstructure, height difference, surface roughness and microscopic morphology, surface and subsurface microhardness and compressive residual stress (CRS). The results of this study highlighted that the deflecting nozzle with a deflection angle of 1.5 mm could obtain relatively optimized jet flow velocities of the water and abrasive mixed phases. The GH4169 specimen treated by the DAWJP with different processing parameters using the optimized deflection angle formed a plastic deformation depth of 22-51 mu m, a height difference between the as-received and DAWJP treated surface of 4-48 mu m, and the surface roughness Ra and Sa of 0.199-0.503 mu m and 0.535-0.953 mu m. The surface microhardness and CRS of the DAWJP treated specimen were approximately 522-573 HV and 773-991 MPa, which is 7.6 %-18.1 % and 209 %-296 % times higher than the as-received specimen, respectively. The work-hardened layer and CRS depth of the near surface of the specimen induced by the DAWJP treatment were approximately 120-180 mu m and 112-203 mu m. This work presents a novel DAWJP method and investigates its effect on the surface integrity of the GH4169 material, which is expected to have applications in improving the surface integrity and mechanical properties of metallic parts with confined spaces.