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焊接参数对搅拌摩擦焊AA7075-T651铝合金对接接头力学性能和微观结构的影响

Effect of Welding Parameters on Mechanical Properties and Microstructure of Friction Stir Welded AA7075-T651 Aluminum Alloy Butt Joints.

作者信息

Kosturek Robert, Torzewski Janusz, Wachowski Marcin, Śnieżek Lucjan

机构信息

Faculty of Mechanical Engineering, Military University of Technology, 2 Gen. S. Kaliskiego Str., 00-908 Warsaw, Poland.

出版信息

Materials (Basel). 2022 Aug 28;15(17):5950. doi: 10.3390/ma15175950.

DOI:10.3390/ma15175950
PMID:36079332
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457428/
Abstract

The aim of this study was to examine the mechanical properties of 5-mm-thick AA7075-T651 alloy using three different welding velocities, 50, 75 and 100 mm/min, and four various sets of tool rotation speeds: 400, 600, 800 and 1000 rpm. All obtained joints were defect-free. In all cases, the values of UTS exceeded 400 MPa, corresponding to 68.5% minimum joint efficiency. The highest value of 447.7 MPa (76.7% joint efficiency) was reported for the joint produced via 400 rpm tool rotation speed and 100 mm/min welding velocity. The SZ microstructure of the strongest joint was characterized by a 5.2 ± 1.7 μm grain size and microhardness of approximately 145 HV0.1. The TMAZ/HAZ interface was identified as the low-hardness zone (105-115 HV0.1, depending on parameters), where the failure of the tensile samples takes place. The fracture mechanism is dominated by a transgranular ductile rupture with microvoid coalescence.

摘要

本研究的目的是使用三种不同的焊接速度（50、75和100毫米/分钟）以及四组不同的刀具转速（400、600、800和1000转/分钟）来检测5毫米厚的AA7075-T651合金的力学性能。所有获得的接头均无缺陷。在所有情况下，抗拉强度值均超过400兆帕，对应至少68.5%的接头效率。对于通过400转/分钟的刀具转速和100毫米/分钟的焊接速度生产的接头，报告的最高值为447.7兆帕（接头效率76.7%）。最强接头的热影响区微观结构的特征是晶粒尺寸为5.2±1.7微米，显微硬度约为145 HV0.1。热机械影响区/热影响区界面被确定为低硬度区（105-115 HV0.1，取决于参数），拉伸试样在此处发生断裂。断裂机制以伴有微孔聚合的穿晶韧性断裂为主。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/a2a1ed2bc8b4/materials-15-05950-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/59a1990feb11/materials-15-05950-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/bbd0ab0d60e9/materials-15-05950-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/9d09a663e3e7/materials-15-05950-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/eea6b6015981/materials-15-05950-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/7baceeeb2403/materials-15-05950-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/2a28ebc1a75b/materials-15-05950-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/022dad32951b/materials-15-05950-g007a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/1827d6dfcf02/materials-15-05950-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/a2a1ed2bc8b4/materials-15-05950-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/59a1990feb11/materials-15-05950-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/bbd0ab0d60e9/materials-15-05950-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/9d09a663e3e7/materials-15-05950-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/eea6b6015981/materials-15-05950-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/7baceeeb2403/materials-15-05950-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/2a28ebc1a75b/materials-15-05950-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/022dad32951b/materials-15-05950-g007a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/1827d6dfcf02/materials-15-05950-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/369d/9457428/a2a1ed2bc8b4/materials-15-05950-g009.jpg

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