旋转摩擦焊接相似和不同碳钢接头的拉伸效率和疲劳寿命

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Madyan Abduljabbar Marir , Ewe Lay Sheng , Imad Obaid Bachi , Mohd Rashdan Isa
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引用次数: 0

摘要

旋转摩擦焊(RFW)是一种固态焊接方法,可以解决其他焊接类型的熔点限制;然而,在操作过程中,由于疲劳,焊接区域仍然存在失效的风险。疲劳失效是一种难以检测和预测的失效模式,是工程上的一种关键失效模式。虽然已有许多疲劳寿命预测方法,但它们没有考虑RFW参数(如压力、速度和摩擦时间)对疲劳强度的影响。C35和C45碳钢由于其良好的机械性能和商业可行性,通常用于制造汽车工业的主要部件。本研究以RFW连接C35和C45为中心,首次使用该技术将C35和C45焊接在一起。C35和C45的RFW的主要目标是构造满足特定设计要求并具有较长疲劳寿命的最优零件。结果显示C45-C45关节的抗拉效率(77%)高于C35-C35关节(73%)。异种C35 - C45接头的拉伸效率分别达到C45母材的60%和C35母材的76%。RFW焊缝的抗拉强度低于母材。采用Coffin-Manson方法,在35 MPa摩擦压力和8-12 s摩擦时间下,异种RFW接头的疲劳寿命提高了85%以上,符合C35和C45的工程要求。SEM显微结构分析表明,材料具有非变形区(NDZ)和塑性变形区(PDZ), PDZ越宽,抗拉强度越好。这些发现提高了RFW的效率,促进了汽车零件的使用寿命和安全性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tensile efficiency and fatigue life of similar and dissimilar carbon steel joints subjected to rotary friction welding

Rotary friction welding (RFW) is a solid-state welding method that can address the melting point limitation of other welding types; however, the welded area remains at risk of failure due to fatigue during operation. Fatigue failure is difficult to detect and predict, making it a critical failure mode in engineering. Although many fatigue life prediction methods are available, they do not consider the impact of RFW parameters (such as pressure, speed, and friction time) on fatigue strength. Owing to their good mechanical properties and commercial viability, carbon steel of grades C35 and C45 is commonly applied to manufacture main parts in the automotive industry. This study centers on employing RFW to join C35 and C45, representing the first-ever instance of using this technique to weld them together. The primary goal of RFW for C35 and C45 is to construct optimum parts that meet specific design requirements and have a long fatigue life. Findings showed C45–C45 joints (77 %) were more tensile-efficient than C35–C35 joints (73 %). Dissimilar C35–C45 joints reached 60 % of C45 base metal and 76 % of C35 base metal in terms of tensile efficiency. RFW welds had lower tensile strength than their base metals. Optimal results came at 35 MPa friction pressure and 8–12 s friction time for both similar and dissimilar RFW joints using the Coffin–Manson method, dissimilar C33–C45 joint fatigue life improved by over 85 %, aligning C35 and C45 engineering aspects. SEM microstructure analysis showed two regions: non-deformed (NDZ) and plastically deformed (PDZ), with broader PDZ indicating better tensile strength. These findings enhance RFW's efficiency, promoting automotive part longevity and safety.

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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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