Effect of tool rotational speed on friction stir spot welds of AZ31B Mg alloy to AISI 304 stainless steel

IF 4.7 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-01-23 DOI:10.1515/mt-2023-0372

Omer Ekinci

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Abstract

AZ31B Mg alloy were welded to AISI 304 stainless steel (which is a very challenging task because of their huge different chemical and physical features) by friction stir spot welding (FSSW) at different tool rotation speeds (700, 1000, and 1300 rpm) while keeping other conditions the same. Welds were evaluated and compared by examining their cross-sectional geometry, XRD pattern, tensile shear strength, fracture way and area. From cross-sections of welds, it was obtained that joining area expanded when speed was enhanced and the weld made through 1300 rpm had the largest one. Therefore, weld fabricated with the highest speed of 1300 rpm displayed the biggest tensile shear load of 3741 N while that manufactured with the lowest speed of 700 rpm possessed the lowest of 2430 N. All welds showed tensile shear type fracture and fracture occurred from the hooking regions where joining took place. From the fracture joint region, the weld of 700 rpm had the smallest joined area, whereas that of 1300 rpm showed the biggest. Higher speed produced a stronger joint, which agreed with a bigger bonding area and broken joint region. Also, joint became more ductile with increasing speed. Some phases were detected in joints.

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工具转速对 AISI 304 不锈钢 AZ31B Mg 合金搅拌摩擦点焊的影响

在保持其他条件不变的情况下，以不同的工具转速（700、1000 和 1300 rpm）通过搅拌摩擦点焊 (FSSW) 将 AZ31B 镁合金焊接到 AISI 304 不锈钢上（这是一项非常具有挑战性的任务，因为它们的化学和物理特性存在巨大差异）。通过检查焊缝的横截面几何形状、XRD 图谱、拉伸剪切强度、断裂方式和面积，对焊缝进行评估和比较。从焊缝的横截面可以看出，当转速提高时，接合面积会扩大，而 1300 转/分钟时的焊缝接合面积最大。因此，以 1300 转/分的最高转速制造的焊缝显示出最大的拉伸剪切载荷，为 3741 牛顿，而以 700 转/分的最低转速制造的焊缝载荷最小，为 2430 牛顿。从断裂接头区域来看，700 转/分的焊缝接合面积最小，而 1300 转/分的焊缝接合面积最大。转速越高，接合强度越大，这与接合区域和断裂接合区域越大有关。此外，接头的韧性也随着转速的增加而增加。在接头中发现了一些相位。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.