400℃高周疲劳下TC17超声冲击强化表面状态演化规律研究  

Investigation on Evolution Laws for Surface States of TC17 Alloy Induced by UIT during High-cycle Fatigue at 400℃

作　　者：谭靓[1,2] 樊怡 姚倡锋[1,2] TAN Liang;FAN Yi;YAO Changfeng(Key Laboratory of High Performance Manufacturing for Aero Engine,Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi'an,710072;Engineering Research Center of Advanced Manufacturing Technology for Aero Engine,Ministry of Education,Northwestern Polytechnical University,Xi'an,710072;Shaanxi Aikespu Electromechanical Technology Co.,Ltd.,Xi'an,710061)

机构地区：[1]西北工业大学航空发动机高性能制造工业和信息化部重点实验室,西安710072 [2]西北工业大学航空发动机先进制造技术教育部工程研究中心,西安710072 [3]陕西艾克斯普机电科技有限责任公司,西安710061

出　　处：《中国机械工程》2025年第4期790-801,共12页China Mechanical Engineering

基　　金：陕西省重点研发计划(2024PT-ZCK-63)。

摘　　要：以TC17钛合金为研究对象,通过超声冲击强化工艺试验、表面状态测试分析和400℃高周疲劳试验,分析了超声冲击强化表面粗糙度、表面几何形貌、表层残余应力、表层显微硬度和表层微观组织等表面状态特征在400℃拉/拉高周疲劳试验过程中的演化规律。结果表明,与超声冲击强化试样初始表面状态相比,试样在400℃下保温1 h后,表面粗糙度Ra从0.46μm增大到0.67μm,表面显微硬度从630 HV0.025降低至450 HV0.025,表面残余压应力从-640 MPa减小到-525 MPa,残余压应力峰值从-1088 MPa减小到-776 MPa,塑性变形层深度由20μm减小到13μm;400℃下试样疲劳断裂后,表面粗糙度为1.22μm,残余压应力影响层深度为70μm,塑性变形层深度为9μm,表层等轴状α相转变为长条状,平均晶粒面积由11.8μm 2增大至34μm 2。Based on UIT experiments,surface state measurement and tension-tension high cycle fatigue tests at 400℃,the evolution laws of surface roughness,surface morphology,residual stress,microhardness,and microstructure of TC17 alloy were investigated.Results show that,compared with the surface states of the UIT processed specimen,after 1h heating treatment at 400℃,the value of surface roughness Ra increases from 0.46μm to 0.67μm,the surface microhardness decreases from 630 HV0.025 to 450 HV0.025,the surface compressive residual stress decreases from-640 MPa to-525 MPa,the maximum value of compressive residual stress decreases from-1088 MPa to-776 MPa,and the depth of plastic deformation layer decreases from 20μm to 13μm.After fatigue failure of the specimen at 400℃,the value of surface roughness Ra is as 1.22μm,the depth of compressive residual stress layer is as 70μm,the depth of plastic deformation layer is as 9μm,and the subsurface equiaxedαphase transforms into elongated strips,the average grain area increases from 11.8μm 2 to 34μm 2.

关 键 词：TC17钛合金 超声冲击强化 表面状态 高周疲劳 演化规律 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]