丁亚茹,陈芙蓉.A-UIT复合处理对7075铝合金激光焊接头摩擦磨损性能的影响[J].表面技术,2021,50(4):235-243.
DING Ya-ru,CHEN Fu-rong.Effect of A-UIT on the Friction and Wear Properties of 7075 Aluminum Alloy Laser Welded Joint[J].Surface Technology,2021,50(4):235-243 |
| A-UIT复合处理对7075铝合金激光焊接头摩擦磨损性能的影响 |
| Effect of A-UIT on the Friction and Wear Properties of 7075 Aluminum Alloy Laser Welded Joint |
| 投稿时间：2020-10-31 修订日期：2021-03-18 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.04.023 |
| 中文关键词: 时效-超声冲击复合处理 纳米晶 摩擦系数 粗糙度 激光焊 磨损率 |
| 英文关键词:aging-ultrasonic impact composite treatment roughness nanocrystalline wear coefficient laser welding wear rate |
| 基金项目:国家自然科学基金(51765053);草原英才项目(DC1800007434);内蒙古自治区轻金属材料与自然科学基金内蒙古重点实验室项目(2017MS0502) |
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| 中文摘要: |
| 目的 研究时效-超声冲击(A-UIT)复合处理方法对铝合金激光焊缝耐磨性的影响。方法 对7075铝合金激光焊缝进行时效处理、超声冲击处理、A-UIT复合处理，对比时效处理、超声冲击处理、A-UIT复合处理后焊缝的表面硬度、表面粗糙度、3D形貌及扫描显微组织，并分析A-UIT复合处理、时效处理和超声冲击处理对焊缝耐磨性能的影响及机理。结果 超声冲击处理的焊缝与焊态进行比较，粗糙度减小了8.65 μm，表面硬度增大了47HV，摩擦系数降低了0.17，磨损率降低了70%;6、24、32 h时效处理后的粗糙度分别比焊态减小了10.18、4.19、5.88 μm，表面硬度比焊态高出37、55、44HV，平均摩擦系数比焊态降低0.10、0.08、0.09，磨损率比焊态低51%、54%、61%;6、24、32 h A-UIT复合处理分别与6、24、32 h时效处理相比，粗糙度减小了9.88、10.58、8.7 μm，表面硬度增大了43、44、31HV，平均摩擦系数降低了0.1、0.1、0.07，磨损率降低了35%、41%、27%。A-UIT复合处理焊缝主要以磨粒磨损为主，且存在局部剥层磨损。单独时效处理焊缝主要以浅色的剥层磨损为主，且存在少量的磨粒磨损，磨损面积较大，并伴有少量的氧化磨损。结论 时效和超声冲击处理均可有效提高焊缝的耐磨性能，超声冲击处理的作用要大于时效处理，摩擦系数比24 h时效处理小15.3%，磨损率为时效处理的36.1%。A-UIT复合处理后的焊缝在纳米晶和时效强化相的共同作用下，比时效处理和超声冲击处理的焊缝耐磨性能提升更为明显。24 h A-UIT复合处理后，焊缝的摩擦系数比24 h时效处理提高了28.5%，比超声冲击状态提高了8.6%，磨损率比24 h时效处理提高了40.9%，比超声冲击状态提高了76.9%。 |
| 英文摘要: |
| The work aims to study the effect of aging-ultrasonic impact composite treatment (A-UIT) on the wear properties of laser welding of aluminum alloy. The method is to treat the laser weld of 7075 aluminum alloy by aging treatment, ultrasonic impact treatment and A-UIT composite treatment. The surface hardness, the surface roughness, the 3D morphology and the scanning microstructure of the weld were compared after aging treatment, ultrasonic impact treatment and A-UIT composite treatment. The effect and mechanism of A-UIT composite treatment, aging treatment and ultrasonic impact treatment on the wear resistance of weld are analyzed. The results show that the roughness of the weld treated by ultrasonic impact is 8.65 μm smaller than that of the untreated weld, the surface hardness of the weld treated by ultrasonic impact is 47HV higher than that of the untreated weld, the friction coefficient of the weld treated by ultrasonic impact is 0.17 lower than that of the untreated weld, and the wear rate of the weld treated by ultrasonic impact is 70% lower than that of the untreated weld. After 6, 24 and 32 h aging treatment, the roughness is 10.18, 4.19 and 5.88 μm smaller than the welding. The surface hardness is 37, 55 and 44 HV higher than the welding. The average wear coefficient is 0.10, 0.08 and 0.09 lower than the welding. The wear rate is 51%, 54% and 61% lower than the welding. Compared with the aging treatment of 6, 24 and 32 hours, the roughness of A-UIT composite treatment is 9.88, 10.58 and 8.7 μm smaller, the surface hardness is 43, 44 and 31HV higher, the average friction coefficient is 0.1, 0.1 and 0.07 lower, and the wear rate is 35%, 41% and 27% lower. The wear of A-UIT composite treatment weld is mainly abrasive wear, and there is local delamination wear. The single aging treatment weld is mainly light color delamination wear, and there is a small amount of abrasive wear, with large wear area and a small amount of oxidation wear. Both the aging treatment and UIT can effectively improve the wear resistance of the laser weld of 7075 aluminum alloy. The UIT is more effective than aging treatment, the wear coefficient of the UIT is 15.3% smaller than the 24 h aging treatment, and the wear rate is 36.1% of the aging treatment. Due to the joint action of nanocrystals and aging intensification phase, the effect of UIT on wear resistance is more obvious than that of aging treatment and UIT. The wear coefficient with 24 h A-UIT is 28.5% higher than 24 h aging treatment, 8.6% higher than UIT. The wear rate with 24 h A-UIT is 40.9% higher than 24 h aging treatment, 76.9% higher than UIT. |
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