TC17/TA19异质旋转摩擦焊结构在疲劳载荷作用下的组织响应及失效机理  

Microstructure Response and Failure Mechanism of TC17/TA19 Heterogeneous Rotating Friction Welding Structure under Fatigue Load

作　　者：陈先民[1] 沈子实 杨俊[1] Chen Xianmin;Shen Zishi;Yang Jun(National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi'an,Shaanxi,710065,China)

机构地区：[1]中国飞机强度研究所强度与结构完整性全国重点实验室,陕西西安710065

出　　处：《飞行器强度研究》2024年第3期1-9,28,共10页Aircraft Strength Research

摘　　要：本文分析了旋转摩擦焊不均匀组织在成形及疲劳载荷作用下的组织响应机理。首先,以异质摩擦焊组织为研究对象,分析了其在成形过程中的组织响应成形行为;其次,利用准原位的思想,解析了摩擦焊不均匀组织在疲劳载荷下的变形分布情况,以解析摩擦焊不均匀组织的疲劳失效机理。获得的主要结果如下:管状结构的TC17/TA19摩擦焊界面组织,TC17侧为等轴、细化的β晶粒,而TA19侧为细小的α'片层组织,其结合主要依靠TA19侧细小的α'片层组织在TC17侧的等轴β晶粒的“穿插”效果。管状结构的TC17/TA19摩擦焊界面组织,疲劳破坏发生在TA19侧热影响区域;其形成原因是由于在疲劳载荷作用下,接头组织响应,使得应力集中在TA19侧热力影响区,最后使得裂纹在TA19侧热力影响区外侧的热影响区形成。This paper investigates the microstructural response mechanisms of heterogeneous friction welds during forming and fatigue service.First,the study focuses on heterogeneous friction weld structures,analyzing their microstructural response and forming behavior during the welding process.Second,using a quasi-in-situ methodology,the deformation distribution of these non-uniform structures under fatigue conditions is analyzed to clarify the fatigue failure mechanisms.The key findings are as follows:At the TC17/TA19 friction weld interface in tubular structures,the TC17 side exhibits equiaxed and refinedβgrains,while the TA19 side consists of fine a'lamellar structures.The bonding between the two materials is primarily facilitated by the interlocking of fine a'lamellar structures from the TA19 side with the equiaxedβgrains from the TC17 side.Fatigue failure is observed in the heat-affected zone on the TA19 side of the weld interface in tubular structures.This failure is attributed to stress concentration in the thermally affected region of the TA19 side during fatigue loading,which ultimately leads to crack initiation in the outer part of this heat-affected zone.

关 键 词：摩擦焊 异质不均匀 疲劳 形貌特征 工艺参数 

分 类 号：TG1[金属学及工艺—金属学]